{"id":13,"date":"2022-01-24T15:30:31","date_gmt":"2022-01-24T07:30:31","guid":{"rendered":"https:\/\/wp.zjia.me\/?p=12"},"modified":"2026-06-19T21:56:54","modified_gmt":"2026-06-19T13:56:54","slug":"03-%e5%9f%ba%e7%a1%80%e7%9f%a5%e8%af%86","status":"publish","type":"post","link":"https:\/\/blog.ttwow.top\/?p=13","title":{"rendered":"03.\u57fa\u7840\u77e5\u8bc6"},"content":{"rendered":"

\u6848\u4f8b\u90fd\u6765\u6e90\u4e8e\u97e9\u987a\u5e73\u8001\u5e08\u7684\u6574\u7406<\/u><\/strong><\/p>\n

\u8f6c\u4e49\u5b57\u7b26<\/h2>\n

Java\u5e38\u89c1\u7684\u8f6c\u4e49\u5b57\u7b26<\/h3>\n

\u5bf9\u5e94\u5173\u7cfb<\/p>\n

\\t  \u5236\u8868\u4f4d\n\\n  \u6362\u884c\n\\\\  \\\n\\" "\n\\' '\n\\r  \u56de\u8f66<\/code><\/pre>\n
\u7ec3\u4e60\u4e00<\/h3>\n
package chapter01;\n\n\/**\n * Author: fang\n * Date:   2022-01-09 10:45 \u661f\u671f\u65e5\n * Class:  ChangeChar\n **\/\n\/\/\u6f14\u793a\u8f6c\u4e49\u5b57\u7b26\u7684\u4f7f\u7528\npublic class ChangeChar {\n\n    \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5\n    public static void main(String[] args) {\n\n        \/\/\\t  \uff1a\u4e00\u4e2a\u5236\u8868\u4f4d\uff0c\u5b9e\u73b0\u5bf9\u9f50\u7684\u529f\u80fd\n        System.out.println("\u5317\u4eac\\t\u5929\u6d25\\t\u4e0a\u6d77");\n        \/\/ \\n  \uff1a\u6362\u884c\u7b26\n        System.out.println("jack\\nsmith\\nmary");\n        \/\/ \\\\  \uff1a\u4e00\u4e2a\\  \\\\\n        System.out.println("C:\\\\Windows\\\\System32\\\\cmd.exe");\n        System.out.println("C:\\\\\\\\Windows\\\\\\\\System32\\\\\\\\cmd.exe");\n        \/\/ \\"  :\u4e00\u4e2a"\n        System.out.println("\u8001\u5b50\u8bf4:\\"\u4e0a\u5584\u82e5\u6c34\\"");\n        \/\/ \\'  \uff1a\u4e00\u4e2a'\n        System.out.println("\u8001\u5b50\u8bf4:\\'\u4e0a\u5584\u82e5\u6c34\\'");\n\n        \/\/ \\r  :\u4e00\u4e2a\u56de\u8f66  System.out.println("\u4e0a\u5584\\r\u82e5\u6c34");\n        \/\/ \u89e3\u8bfb\n        \/\/ 1. \u8f93\u51fa  \u4e0a\u5584\n        \/\/ 2. \\r\u8868\u793a\u56de\u8f66\n        System.out.println("\u4e0a\u5584\\r\u82e5\u6c34"); \/\/\u82e5\u6c34\n    }\n\n}\n<\/code><\/pre>\n
\u7ed3\u679c\uff1a<\/p>\n
\u5317\u4eac  \u5929\u6d25  \u4e0a\u6d77\njack\nsmith\nmary\nC:\\Windows\\System32\\cmd.exe\nC:\\\\Windows\\\\System32\\\\cmd.exe\n\u8001\u5b50\u8bf4:"\u4e0a\u5584\u82e5\u6c34"\n\u8001\u5b50\u8bf4:'\u4e0a\u5584\u82e5\u6c34'\n\u82e5\u6c34\n\nProcess finished with exit code 0\n<\/code><\/pre>\n
\u7ec3\u4e60\u4e8c<\/h3>\n
\"image-20220109103055348\"<\/div><\/p>\n
package chapter01;\n\n\/**\n * Author: fang\n * Date: 2022\/1\/910:27\n **\/\npublic class ChangeCharExer01 {\n\n    public static void main(String[] args) {\n\n        System.out.println("\u4e66\u540d\\t\u4f5c\u8005\\t\u4ef7\u683c\\t\u9500\u91cf\\n\u4e09\u56fd\\t\u7f57\u8d2f\u4e2d\\t120\\t1000");\n\n    }\n}\n<\/code><\/pre>\n
\u7ed3\u679c\uff1a<\/p>\n
\u4e66\u540d  \u4f5c\u8005  \u4ef7\u683c  \u9500\u91cf\n\u4e09\u56fd  \u7f57\u8d2f\u4e2d 120 1000\n\nProcess finished with exit code 0\n<\/code><\/pre>\n
\u6ce8\u91ca(comment)<\/h2>\n
\u7528\u4e8e\u6ce8\u89e3\u8bf4\u660e\u89e3\u91ca\u7a0b\u5e8f\u7684\u6587\u5b57\u5c31\u662f\u6ce8\u91ca\uff0c\u6ce8\u91ca\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u9605\u8bfb\u6027\uff08\u53ef\u8bfb\u6027\uff09\uff1b\u6ce8\u91ca
\n\u662f\u4e00\u4e2a\u7a0b\u5e8f\u5458\u5fc5\u987b\u8981\u5177\u6709\u7684\u826f\u597d\u7f16\u7a0b\u4e60\u60ef<\/strong>\u3002\u5c06\u81ea\u5df1\u7684\u601d\u60f3\u901a\u8fc7\u6ce8\u91ca\u5148\u6574\u7406\u51fa\u6765\uff0c\u518d\u7528
\n\u4ee3\u7801\u53bb\u4f53\u73b0\u3002\u3010\u4e3e\u4f8b]<\/p>\n
Java\u4e2d\u7684\u6ce8\u91ca\u7c7b\u578b<\/p>\n
    \n
  1. \n\u5355\u884c\u6ce8\u91ca<\/p>\n
    \u57fa\u672c\u683c\u5f0f
    \n\u683c\u5f0f\uff1a \/\/\u6ce8\u91ca\u6587\u5b57\n<\/li>\n
  2. \n\u591a\u884c\u6ce8\u91ca<\/p>\n
    \u57fa\u672c\u683c\u5f0f
    \n\u683c\u5f0f\uff1a \/ \u6ce8\u91ca\u6587\u5b57 <\/em>\/\n<\/li>\n
  3. \n\u6587\u6863\u6ce8<\/p>\n
    \u4f7f\u7528\u7ec6\u8282
    \n1)\u88ab\u6ce8\u91ca\u7684\u6587\u5b57\uff0c\u4e0d\u4f1a\u88abJVM\uff08java\u865a\u62df\u673a\uff09\u89e3\u91ca\u6267\u884c
    \n2)\u591a\u884c\u6ce8\u91ca\u91cc\u9762\u4e0d\u5141\u8bb8\u6709\u591a\u884c\u6ce8\u91ca\u5d4c\u5957\n<\/li>\n<\/ol>\n
    \u5355\u884c\u6ce8\u91ca<\/h3>\n
    \/\/\u57fa\u672c\u683c\u5f0f\uff1a\n\/\/\u6ce8\u91ca\u6587\u5b57<\/code><\/pre>\n
    \u591a\u884c\u6ce8\u91ca<\/h3>\n
    \u57fa\u672c\u683c\u5f0f\n\/* \u6ce8\u91ca\u6587\u5b57*\/<\/code><\/pre>\n
    package chapter01;\n\n\/**\n * Author: fang\n * Date:   2022-01-09 11:06 \u661f\u671f\u65e5\n * Class:  Comment01\n **\/\n\/\/\u6f14\u793a\u6ce8\u91ca\u4f7f\u7528\npublic class Comment01 {\n\n    \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5\n    public static void main(String[] args) {\n\n        \/\/\u5355\u884c\u6ce8\u91ca\n\n        \/\/\u591a\u884c\u6ce8\u91ca\n        \/*  \u793a\u610f => \u53ef\u8bfb\u6027\u5f88\u597d\n            \u4e0b\u9762\u4ee3\u7801\u5b8c\u6210 \u4e24\u4e2a\u6570\u76f8\u52a0\n            \u5b9a\u4e49\u53d8\u91cf\n\n            \u6ce8\u91ca\n            \u6ce8\u91ca\n            int n1 = 10;...\n            System.out.println("ok~~");\n            *\/\n        int n1 = 10;\n        int n2 = 30;\n        \/\/\u6c42\u548c\n        int sum = n1 + n2;\n        \/\/\u8f93\u51fa\u7ed3\u679c\n        System.out.println("\u7ed3\u679c=" + sum);\n    }\n}\n<\/code><\/pre>\n
    \u6587\u6863\u6ce8\u91ca<\/h3>\n
    \u6587\u6863\u6ce8\u91ca\uff1a
    \n\u6ce8\u91ca\u5185\u5bb9\u53ef\u4ee5\u88abJDK\u63d0\u4f9b\u7684\u5de5\u5177 javadoc \u6240\u89e3\u6790\uff0c\u751f\u6210\u4e00\u5957\u4ee5\u7f51\u9875\u6587\u4ef6\u5f62\u5f0f\u4f53\u73b0\u7684\u8be5
    \n\u7a0b\u5e8f\u7684\u8bf4\u660e\u6587\u6863,\u4e00\u822c\u5199\u5728\u7c7b<\/p>\n
    \u57fa\u672c\u683c\u5f0f<\/h4>\n
    \u5982\u4f55\u751f\u6210\u5bf9\u5e94\u7684\u6587\u6863\u6ce8\u91ca<\/p>\n
    javadoc -d \u6587\u4ef6\u5939\u540d -xx -yy Comment02.java<\/p>\n
    \u5e94\u7528\u5b9e\u4f8b<\/h4>\n
    PS C:\\java\\javaAll\\java\u57fa\u7840\\\u4ee3\u7801\\chapter01> javadoc -d d:\\\\temp -author -version Comment02.java\u6b63\u5728\u52a0\u8f7d\u6e90\u6587\u4ef6Comment02.java... \u6b63\u5728\u6784\u9020 Javadoc \u4fe1\u606f... \u6807\u51c6 Doclet \u7248\u672c 1.8.0_191\u6b63\u5728\u6784\u5efa\u6240\u6709\u7a0b\u5e8f\u5305\u548c\u7c7b\u7684\u6811...\u6b63\u5728\u751f\u6210d:\\temp\\chapter01\\Comment02.html...\u6b63\u5728\u751f\u6210d:\\temp\\chapter01\\package-frame.html...\u6b63\u5728\u751f\u6210d:\\temp\\chapter01\\package-summary.html...\u6b63\u5728\u751f\u6210d:\\temp\\chapter01\\package-tree.html...\u6b63\u5728\u751f\u6210d:\\temp\\constant-values.html...\u6b63\u5728\u6784\u5efa\u6240\u6709\u7a0b\u5e8f\u5305\u548c\u7c7b\u7684\u7d22\u5f15...\u6b63\u5728\u751f\u6210d:\\temp\\overview-tree.html...\u6b63\u5728\u751f\u6210d:\\temp\\index-all.html...\u6b63\u5728\u751f\u6210d:\\temp\\deprecated-list.html...\u6b63\u5728\u6784\u5efa\u6240\u6709\u7c7b\u7684\u7d22\u5f15...\u6b63\u5728\u751f\u6210d:\\temp\\allclasses-frame.html...\u6b63\u5728\u751f\u6210d:\\temp\\allclasses-noframe.html...\u6b63\u5728\u751f\u6210d:\\temp\\index.html...\u6b63\u5728\u751f\u6210d:\\temp\\help-doc.html...PS C:\\java\\javaAll\\java\u57fa\u7840\\\u4ee3\u7801\\chapter01><\/code><\/pre>\n
    \"image-20220109111623907\"<\/div><\/p>\n
    \u53d8\u91cf<\/h2>\n
    \u57fa\u672c\u6982\u5ff5<\/h3>\n
    \u53d8\u91cf\u662f\u7a0b\u5e8f\u7684\u57fa\u672c\u7ec4\u6210\u5355\u4f4d<\/strong><\/p>\n
    \u57fa\u672c\u8981\u7d20\uff1a\u7c7b\u578b+\u540d\u79f0+\u503c<\/p>\n
    \u53d8\u91cf\u76f8\u5f53\u4e8e\u5185\u5b58\u4e2d\u4e00\u4e2a\u6570\u636e\u5b58\u50a8\u7a7a\u95f4\u7684\u8868\u793a\uff0c\u4f60\u53ef\u4ee5\u628a\u53d8\u91cf\u770b\u505a\u662f\u4e00\u4e2a\u623f\u95f4\u7684\u95e8
    \n\u724c\u53f7\uff0c\u901a\u8fc7\u95e8\u724c\u53f7\u6211\u4eec\u53ef\u4ee5\u627e\u5230\u623f\u95f4\uff0c\u800c\u901a\u8fc7\u53d8\u91cf\u540d\u53ef\u4ee5\u8bbf\u95ee\u5230\u53d8\u91cf(\u503c)\u3002<\/p>\n
    \u53d8\u91cf\u4f7f\u7528\u7684\u57fa\u672c\u6b65\u9aa41)\u58f0\u660e\u53d8\u91cfint a;2) \u8d4b\u503ca = 60;3)\u4f7f\u7528System.out.println(a);\/\/\u4e5f\u53ef\u4ee5\u4e00\u6b65\u5230\u4f4d[int a = 60; \u901a\u5e38\u90fd\u662f\u4e00\u6b65\u5b8c\u6210]<\/code><\/pre>\n
    \u6f14\u793a1\uff1a<\/h4>\n
    public class Var01 {    \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/\u58f0\u660e\u53d8\u91cf      int a;      a = 100;        System.out.println(a);      \/\/\u8fd8\u53ef\u4ee5\u8fd9\u6837\u4f7f\u7528       int b = 800;        System.out.println(b);  }}<\/code><\/pre>\n
    \u6f14\u793a2\uff1a<\/h4>\n
    public class Var02 {    \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/\u8bb0\u5f55\u4eba\u7684\u4fe1\u606f        int age = 30;       double score = 88.9;        char gender = '\u7537';        String name = "king";     \/\/\u8f93\u51fa\u4fe1\u606f, \u5feb\u6377\u952e     System.out.println("\u4eba\u7684\u4fe1\u606f\u5982\u4e0b:");        System.out.println(name);       System.out.println(age);        System.out.println(score);      System.out.println(gender);         }}<\/code><\/pre>\n
    \u6ce8\u610f\u4e8b\u9879\uff1a<\/h4>\n
    \u53d8\u91cf\u4f7f\u7528\u6ce8\u610f\u4e8b\u98791.\u53d8\u91cf\u8868\u793a\u5185\u5b58\u4e2d\u7684\u4e00\u4e2a\u5b58\u50a8\u533a\u57df [\u4e0d\u540c\u7684\u53d8\u91cf\uff0c\u7c7b\u578b\u4e0d\u540c\uff0c\u5360\u7528\u7684\u7a7a\u95f4\u5927\u5c0f\u4e0d\u540c\uff0c\u6bd4\u5982: int 4 \u4e2a\u5b57\u8282, double \u5c31\u662f 8\u4e2a\u5b57\u8282]2.\u8be5\u533a\u57df\u6709\u81ea\u5df1\u7684\u540d\u79f0[\u53d8\u91cf\u540d]\u548c\u7c7b\u578b[\u6570\u636e\u7c7b\u578b]3.\u53d8\u91cf\u5fc5\u987b\u5148\u58f0\u660e\uff0c\u540e\u4f7f\u7528\uff0c\u5373\u6709\u987a\u5e8f4.\u8be5\u533a\u57df\u7684\u6570\u636e\u53ef\u4ee5\u5728\u540c\u4e00\u7c7b\u578b\u8303\u56f4\u5185\u4e0d\u65ad\u53d8\u53165.\u53d8\u91cf\u5728\u540c\u4e00\u4f5c\u7528\u57df\u5185\u4e0d\u80fd\u91cd\u540d6.\u53d8\u91cf=\u53d8\u91cf\u540d+\u503c+\u6570\u636e\u7c7b\u578b\uff0c\u8fd9\u4e00\u70b9\u8bf7\u5927\u5bb6\u6ce8\u610f\u3002\u53d8\u91cf\u4e09\u8981\u7d20<\/code><\/pre>\n
    \u7ec6\u8282<\/h4>\n
    public class VarDetail {    \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/\u53d8\u91cf\u5fc5\u987b\u5148\u58f0\u660e\uff0c\u540e\u4f7f\u7528, \u5373\u6709\u987a\u5e8f     int a = 50;\/\/int        System.out.println(a);\/\/50      \/\/\u8be5\u533a\u57df\u7684\u6570\u636e\/\u503c\u53ef\u4ee5\u5728\u540c\u4e00\u7c7b\u578b\u8303\u56f4\u5185\u4e0d\u65ad\u53d8\u5316        \/\/a = "jack"; \/\/\u00d7     a = 88; \/\/\u5bf9     System.out.println(a);\/\/88              \/\/\u53d8\u91cf\u5728\u540c\u4e00\u4e2a\u4f5c\u7528\u57df\u5185\u4e0d\u80fd\u91cd\u540d        \/\/int a = 77;\/\/\u9519\u8bef   }}class Dog {   public static void main(String[] args) {        int a = 666;\/\/\u5bf9 }}<\/code><\/pre>\n
    +\u53f7\u7684\u4f7f\u7528<\/h3>\n
    1.\u5f53\u5de6\u53f3\u4e24\u8fb9\u90fd\u662f\u6570\u503c\u578b\u65f6\uff0c\u505a\u52a0\u6cd5\u8fd0\u7b97<\/p>\n
    2.\u5f53\u5de6\u53f3\u4e24\u8fb9\u6709\u4e00\u65b9\u4e3a\u5b57\u7b26\u4e32\u65f6\uff0c\u5219\u505a\u62fc\u63a5\u8fd0\u8f93<\/p>\n
    3.\u4ece\u5de6\u5411\u53f3\u8fd0\u7b97(\u6ca1\u6709\u4f18\u5148\u7ea7\u9ad8\u7684\u65f6)<\/p>\n
    \/** * Author: fang * Date:   2022-01-09 13:17 \u661f\u671f\u65e5 * Class:  Plus01 **\/public class Plus01 {    public static void main(String[] args) {        System.out.println(100 + 11);        System.out.println("100" + 11);        System.out.println(100 + 11 + "hello");        System.out.println("hello" + 100 + 11);    }}<\/code><\/pre>\n
    \u7ed3\u679c\uff1a<\/p>\n
    11110011111hellohello10011Process finished with exit code 0<\/code><\/pre>\n
    \u6570\u636e\u7c7b\u578b<\/h3>\n
    \u6bcf\u4e00\u79cd\u6570\u636e\u90fd\u5b9a\u4e49\u4e86\u660e\u786e\u7684\u6570\u636e\u7c7b\u578b\uff08Java\u662f\u5f3a\u6570\u636e\u7c7b\u578b\uff09\uff0c\u5728\u5185\u5b58\u4e2d\u5206\u914d\u4e86\u4e0d\u540c\u5927\u5c0f\u7684\u5185\u5b58\u7a7a\u95f4\uff08\u5b57\u8282\uff09<\/p>\n
    \"image-20220109132154072\"<\/div><\/p>\n
    \u4e0a\u56fe\u8bf4\u660e
    \n1.java\u6570\u636e\u7c7b\u578b\u5206\u4e3a\u4e24\u5927\u7c7b\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u5f15\u7528\u7c7b\u578b
    \n2.\u57fa\u672c\u6570\u636e\u7c7b\u578b\u67098\u79cd \u6570\u503c\u578b [byte , short , int , long , float ,double] char , boolean
    \n3.\u5f15\u7528\u7c7b\u578b[\u7c7b\uff0c\u63a5\u53e3\uff0c\u6570\u7ec4]<\/p>\n
    \u6574\u578b<\/h4>\n
    \u57fa\u672c\u4ecb\u7ecd<\/h5>\n
    Java\u7684\u6574\u6570\u7c7b\u578b\u5c31\u662f\u7528\u4e8e\u5b58\u653e\u6574\u6570\u503c\u7684\uff0c\u6bd4\u5982 12\uff0c30,3456\u7b49\u7b49<\/p>\n
    \"image-20220109132729060\"<\/div><\/p>\n
    \u7ec6\u8282<\/h5>\n
    1\uff0eJava\u5404\u6574\u6570\u7c7b\u578b\u6709\u56fa\u5b9a\u7684\u8303\u56f4\u548c\u5b57\u6bb5\u957f\u5ea6\uff0c\u4e0d\u53d7\u5177\u4f53OS[\u64cd\u4f5c\u7cfb\u7edf]\u7684\u5f71\u54cd\uff0c\u4ee5\u4fdd\u8bc1java\u7a0b\u5e8f\u7684\u53ef\u79fb\u690d\u6027\u30022. Java\u7684\u6574\u578b\u5e38\u91cf\uff08\u5177\u4f53\u503c\uff09\u9ed8\u8ba4\u4e3a int \u578b\uff0c\u58f0\u660elong\u578b\u5e38\u91cf\u987b\u540e\u52a0 "l\u2019\u6216\u2018L\u20193. java\u7a0b\u5e8f\u4e2d\u53d8\u91cf\u5e38\u58f0\u660e\u4e3aint\u578b\uff0c\u9664\u975e\u4e0d\u8db3\u4ee5\u8868\u793a\u5927\u6570\uff0c\u624d\u4f7f\u7528long4. bit: \u8ba1\u7b97\u673a\u4e2d\u7684\u6700\u5c0f\u5b58\u50a8\u5355\u4f4d\u3002byte:\u8ba1\u7b97\u673a\u4e2d\u57fa\u672c\u5b58\u50a8\u5355\u5143,    1byte = 8 bit\u3002   [\u4e8c\u8fdb\u5236\u518d\u8be6\u7ec6\u8bf4\uff0c\u7b80\u5355\u4e3e\u4f8b\u4e00\u4e2a byte 3 \u548c short 3 ]   \u601d\u8003\u9898\uff1along \u7c7b\u578b\uff0c\u6709\u51e0\u4e2a bit   [8 * 8 = 64 bit]  <\/code><\/pre>\n
        \/\/Java\u7684\u6574\u578b\u5e38\u91cf\uff08\u5177\u4f53\u503c\uff09\u9ed8\u8ba4\u4e3a int \u578b\uff0c\u58f0\u660elong\u578b\u5e38\u91cf\u987b\u540e\u52a0\u2018l\u2019\u6216\u2018L\u2019   int n1 = 1;\/\/4\u4e2a\u5b57\u8282   \/\/int n2 = 1L;\/\/\u9519\u8bef\u5199\u6cd5    long n3 = 1L;\/\/\u5bf9<\/code><\/pre>\n
    \u5185\u5b58\u4e2d\u8868\u73b0<\/h5>\n
    \"image-20220109133701867\"<\/div><\/p>\n
    \u6d6e\u70b9\u578b<\/h4>\n
    \u57fa\u672c\u4ecb\u7ecd<\/h5>\n
    Java\u7684\u6d6e\u70b9\u7c7b\u578b\u53ef\u4ee5\u8868\u793a\u4e00\u4e2a\u5c0f\u6570 \u4f8b\u5982123.4 \uff0c 7.8 \uff0c0.12<\/p>\n
    \"image-20220109134045764\"<\/div><\/p>\n
    \u7ec6\u8282<\/h5>\n
    \"image-20220109134425845\"<\/div><\/p>\n
    \u6f14\u793a\u4ee3\u7801<\/h5>\n
    public class FloatDetail {  \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/Java \u7684\u6d6e\u70b9\u578b\u5e38\u91cf(\u5177\u4f53\u503c)\u9ed8\u8ba4\u4e3adouble\u578b\uff0c\u58f0\u660efloat\u578b\u5e38\u91cf\uff0c\u987b\u540e\u52a0\u2018f\u2019\u6216\u2018F'     \/\/float num1 = 1.1; \/\/\u5bf9\u4e0d\u5bf9?\u9519\u8bef        float num2 = 1.1F; \/\/\u5bf9\u7684     double num3 = 1.1; \/\/\u5bf9      double num4 = 1.1f; \/\/\u5bf9     \/\/\u5341\u8fdb\u5236\u6570\u5f62\u5f0f\uff1a\u5982\uff1a5.12       512.0f        .512   (\u5fc5\u987b\u6709\u5c0f\u6570\u70b9\uff09     double num5 = .123; \/\/\u7b49\u4ef7 0.123      System.out.println(num5);       \/\/\u79d1\u5b66\u8ba1\u6570\u6cd5\u5f62\u5f0f:\u5982\uff1a5.12e2 [5.12 * 10\u76842\u6b21\u65b9 ]      5.12E-2   []       System.out.println(5.12e2);\/\/512.0      System.out.println(5.12E-2);\/\/0.0512        \/\/\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u5e94\u8be5\u4f7f\u7528double\u578b\uff0c\u56e0\u4e3a\u5b83\u6bd4float\u578b\u66f4\u7cbe\u786e\u3002      \/\/[\u4e3e\u4f8b\u8bf4\u660e]double num9 = 2.1234567851;float num10 =  2.1234567851F;        double num9 =  2.1234567851;        float num10 =  2.1234567851F;       System.out.println(num9);       System.out.println(num10);      \/\/\u6d6e\u70b9\u6570\u4f7f\u7528\u9677\u9631: 2.7 \u548c 8.1 \/ 3  \u6bd4\u8f83        \/\/\u770b\u770b\u4e00\u6bb5\u4ee3\u7801        double num11 = 2.7;     double num12 = 2.7; \/\/8.1 \/ 3; \/\/2.7        System.out.println(num11);\/\/2.7     System.out.println(num12);\/\/\u63a5\u8fd12.7\u7684\u4e00\u4e2a\u5c0f\u6570\uff0c\u800c\u4e0d\u662f2.7       \/\/\u5f97\u5230\u4e00\u4e2a\u91cd\u8981\u7684\u4f7f\u7528\u70b9: \u5f53\u6211\u4eec\u5bf9\u8fd0\u7b97\u7ed3\u679c\u662f\u5c0f\u6570\u7684\u8fdb\u884c\u76f8\u7b49\u5224\u65ad\u662f\uff0c\u8981\u5c0f\u5fc3       \/\/\u5e94\u8be5\u662f\u4ee5\u4e24\u4e2a\u6570\u7684\u5dee\u503c\u7684\u7edd\u5bf9\u503c\uff0c\u5728\u67d0\u4e2a\u7cbe\u5ea6\u8303\u56f4\u7c7b\u5224\u65ad     if( num11 == num12) {           System.out.println("num11 == num12 \u76f8\u7b49");      }       \/\/\u6b63\u786e\u7684\u5199\u6cd5 , ctrl + \/ \u6ce8\u91ca\u5feb\u6377\u952e, \u518d\u6b21\u8f93\u5165\u5c31\u53d6\u6d88\u6ce8\u91ca     if(Math.abs(num11 - num12) < 0.000001 ) {            System.out.println("\u5dee\u503c\u975e\u5e38\u5c0f\uff0c\u5230\u6211\u7684\u89c4\u5b9a\u7cbe\u5ea6\uff0c\u8ba4\u4e3a\u76f8\u7b49...");      }       \/\/ \u53ef\u4ee5\u901a\u8fc7java API  \u6765\u770b \u4e0b\u4e00\u4e2a\u89c6\u9891\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528API      System.out.println(Math.abs(num11 - num12));        \/\/\u7ec6\u8282:\u5982\u679c\u662f\u76f4\u63a5\u67e5\u8be2\u5f97\u7684\u7684\u5c0f\u6570\u6216\u8005\u76f4\u63a5\u8d4b\u503c\uff0c\u662f\u53ef\u4ee5\u5224\u65ad\u76f8\u7b49         }}<\/code><\/pre>\n
    \u5b57\u7b26\u7c7b\u578b<\/h4>\n
    \u57fa\u672c\u4ecb\u7ecd<\/h5>\n
    \u5b57\u7b26\u7c7b\u578b\u53ef\u4ee5\u8868\u793a\u5355\u4e2a\u5b57\u7b26<\/strong>,\u5b57\u7b26\u7c7b\u578b\u662fchar, char\u662f\u4e24\u4e2a\u5b57\u8282(\u53ef\u4ee5\u5b58\u653e\u6c49\u5b57),
    \n\u591a\u4e2a\u5b57\u7b26\u6211\u4eec\u7528\u5b57\u7b26\u4e32String<\/p>\n
    \u6f14\u793a<\/h5>\n
    package chapter03;\/** * Author: fang * Date:   2022-01-09 13:48 \u661f\u671f\u65e5 * Class:  Char01 **\/public class Char01 {    public static void main(String[] args) {        char c1 = 'a';        char c2 = '\\t';        char c3 = '\u97e9';        char c4 = 97; \/\/\u8bf4\u660e: \u5b57\u7b26\u7c7b\u578b\u53ef\u4ee5\u76f4\u63a5\u5b58\u653e\u4e00\u4e2a\u6570\u5b57        \/\/\u4fee\u6539\u5feb\u6377\u952e        \/\/\u5220\u9664\u5f53\u524d\u884c\u7684\u5feb\u6377\u952e\u4f7f\u7528 ctrl+shif+k => ctrl+ k        System.out.println(c1);        System.out.println(c2);        System.out.println(c3);        System.out.println(c4);\/\/\u5f53\u8f93\u51fac4\u65f6\u5019\uff0c\u4f1a\u8f93\u51fa97\u8868\u793a\u7684\u5b57\u7b26 => \u7f16\u7801\u7684\u6982\u5ff5    }}<\/code><\/pre>\n
    \u7ed3\u679c\uff1a<\/p>\n
    a   \u97e9aProcess finished with exit code 0<\/code><\/pre>\n
    \u5b57\u7b26\u7c7b\u578b\u4f7f\u7528\u7ec6\u8282<\/h5>\n
    1\uff0e\u5b57\u7b26\u5e38\u91cf\u662f\u7528\u5355\u5f15\u53f7('')\u62ec\u8d77\u6765\u7684\u5355\u4e2a\u5b57\u7b26\u3002\u4f8b\u5982:char c1 = 'a'\uff1bchar c2 = "\u4e2d'; char c3 = "9';2.Java\u4e2d\u8fd8\u5141\u8bb8\u4f7f\u7528\u8f6c\u4e49\u5b57\u7b26'\\' \u6765\u5c06\u5176\u540e\u7684\u5b57\u7b26\u8f6c\u53d8\u4e3a\u7279\u6b8a\u5b57\u7b26\u578b\u5e38\u91cf\u3002   \u4f8b\u5982\uff1achar c3 ='\\n'\uff1b\/\/ "\\n'\u8868\u793a\u6362\u884c\u7b263.\u5728java\u4e2d, char\u7684\u672c\u8d28\u662f\u4e00\u4e2a\u6574\u6570\uff0c\u5728\u8f93\u51fa\u65f6\uff0c\u662funicode\u7801\u5bf9\u5e94\u7684\u5b57\u7b26\u3002   http:\/\/tool.chinaz.com\/Tools\/Unicode.aspx4.\u53ef\u4ee5\u76f4\u63a5\u7ed9char\u8d4b\u4e00\u4e2a\u6574\u6570,\u7136\u540e\u8f93\u51fa\u65f6\uff0c\u4f1a\u6309\u7167\u5bf9\u5e94\u7684unicode\u5b57\u7b26\u8f93\u51fa[97]5.char\u7c7b\u578b\u662f\u53ef\u4ee5\u8fdb\u884c\u8fd0\u7b97\u7684\uff0c\u76f8\u5f53\u4e8e\u4e00\u4e2a\u6574\u6570\uff0c\u56e0\u4e3a\u5b83\u90fd\u5bf9\u5e94\u6709Unode\u7801.<\/code><\/pre>\n
    \u7ec6\u8282\u4ee3\u7801<\/h5>\n
    package chapter03;\/** * Author: fang * Date:   2022-01-09 13:55 \u661f\u671f\u65e5 * Class:  CharDetail **\/public class CharDetail {    \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/\u5728java\u4e2d\uff0cchar\u7684\u672c\u8d28\u662f\u4e00\u4e2a\u6574\u6570\uff0c\u5728\u9ed8\u8ba4\u8f93\u51fa\u65f6\uff0c\u662funicode\u7801\u5bf9\u5e94\u7684\u5b57\u7b26        \/\/\u8981\u8f93\u51fa\u5bf9\u5e94\u7684\u6570\u5b57\uff0c\u53ef\u4ee5(int)\u5b57\u7b26        char c1 = 97;        System.out.println(c1); \/\/ a        char c2 = 'a'; \/\/\u8f93\u51fa'a' \u5bf9\u5e94\u7684 \u6570\u5b57        System.out.println((int)c2);        char c3 = '\u97e9';        System.out.println((int)c3);\/\/38889        char c4 = 38889;        System.out.println(c4);\/\/\u97e9        \/\/char\u7c7b\u578b\u662f\u53ef\u4ee5\u8fdb\u884c\u8fd0\u7b97\u7684\uff0c\u76f8\u5f53\u4e8e\u4e00\u4e2a\u6574\u6570\uff0c\u56e0\u4e3a\u5b83\u90fd\u5bf9\u5e94\u6709Unicode\u7801.        System.out.println('a' + 10);\/\/107        \/\/\u8bfe\u5802\u5c0f\u6d4b\u8bd5        char c5 = 'b' + 1;\/\/98+1==> 99        System.out.println((int)c5); \/\/99        System.out.println(c5); \/\/99->\u5bf9\u5e94\u7684\u5b57\u7b26->\u7f16\u7801\u8868ASCII(\u89c4\u5b9a\u597d\u7684)=>c    }}<\/code><\/pre>\n
    \u7ed3\u679c<\/p>\n
    a9738889\u97e910799cProcess finished with exit code 0<\/code><\/pre>\n
    \u5b57\u7b26\u7c7b\u578b\u7684\u672c\u8d28<\/h5>\n
    1\uff0e\u5b57\u7b26\u578b \u5b58\u50a8\u5230 \u8ba1\u7b97\u673a\u4e2d\uff0c\u9700\u8981\u5c06\u5b57\u7b26\u5bf9\u5e94\u7684\u7801\u503c\uff08\u6574\u6570\uff09\u627e\u51fa\u6765\uff0c\u6bd4\u5982'a"\uff1a   \u5b58\u50a8: 'a' ==> \u7801\u503c 97 ==> \u4e8c\u8fdb\u5236\uff08110 0001\uff09 ==> \u5b58\u50a8   \u8bfb\u53d6\uff1a\u4e8c\u8fdb\u5236\uff08110 0001\uff09 => 97 ===> 'a' => \u663e\u793a2. \u5b57\u7b26\u548c\u7801\u503c\u7684\u5bf9\u5e94\u5173\u7cfb\u662f\u901a\u8fc7\u5b57\u7b26\u7f16\u7801\u8868\u51b3\u5b9a\u7684(\u662f\u89c4\u5b9a\u597d)\u25cf \u4ecb\u7ecd\u4e00\u4e0b\u5b57\u7b26\u7f16\u7801\u8868 [sublime\u6d4b\u8bd5]ASCII (ASCII \u7f16\u7801\u8868 \u4e00\u4e2a\u5b57\u8282\u8868\u793a \uff0c\u4e00\u4e2a128\u4e2a\u5b57\u7b26\uff0c\u5b9e\u9645\u4e0a\u4e00\u4e2a\u5b57\u8282\u53ef\u4ee5\u8868\u793a256\u54e5\u5b57\u7b26)Unicode (Unicode \u7f16\u7801\u8868 \u56fa\u5b9a\u5927\u5c0f\u7684\u7f16\u7801 \u4f7f\u7528\u4e24\u4e2a\u5b57\u8282\u6765\u8868\u793a\u5b57\u7b26\uff0c\u5b57\u6bcd\u548c\u6c49\u5b57\u7edf\u4e00\u5360\u7528\u4e24\u4e2a\u5b57\u8282\uff0c\u8fd9\u6837\u6d6a\u8d39\u7a7a\u95f4 )---\u53ea\u662f\u89c4\u8303 \u76ee\u524d\u5b9e\u9645\u5b9e\u73b0\u7684unicode\u7f16\u7801\u53ea\u8981\u6709\u4e09\u79cd\uff1aUTF-8,UCS-2\u548cUTF-16\uff0c\u4e09\u79cdunicode\u5b57\u7b26\u96c6\u4e4b\u95f4\u53ef\u4ee5\u6309\u7167\u89c4\u8303\u8fdb\u884c\u8f6c\u6362utf-8\uff08\u7f16\u7801\u8868\uff0c\u5927\u5c0f\u53ef\u53d8\u7684\u7f16\u7801 \u5b57\u6bcd\u4f7f\u75281\u4e2a\u5b57\u8282\uff0c\u6c49\u5b57\u4f7f\u75283\u4e2a\u5b57\u8282\uff09gbk (\u53ef\u4ee5\u8868\u793a\u6c49\u5b57\uff0c\u800c\u4e14\u8303\u56f4\u5e7f\uff0c\u5b57\u6bcd\u4f7f\u75281\u4e2a\u5b57\u8282\uff0c\u6c49\u5b572\u4e2a\u5b57\u8282)gb2312 (\u53ef\u4ee5\u8868\u793a\u6c49\u5b57, gb2312 < gbk)bia5\u7801(\u7e41\u4f53\u4e2d\u6587\uff0c\u53f0\u6e7e\uff0c\u9999\u6e2f)<\/code><\/pre>\n
    \u5e03\u5c14\u7c7b\u578b<\/h4>\n
    \u57fa\u672c\u4ecb\u7ecd<\/h5>\n
    1\uff0e\u5e03\u5c14\u7c7b\u578b\u4e5f\u53ebboolean\u7c7b\u578b\uff0cboolean\u7c7b\u578b\u53ea\u5141\u8bb8\u53d6\u503ctrue\u548cfalse\uff0cnull
    \n2\uff0eboolean\u7c7b\u578b\u53601\u4e2a\u5b57\u8282\u3002
    \n3.boolean\u7c7b\u578b\u9002\u4e8e\u903b\u8f91\u8fd0\u7b97\uff0c\u4e00\u822c\u7528\u4e8e\u6d41\u7a0b\u63a7\u5236<\/p>\n
      \n
    • if\u6761\u4ef6\u63a7\u5236\u8bed\u53e5;<\/li>\n
    • while\u5faa\u73af\u63a7\u5236\u8bed\u53e5;<\/li>\n
    • do-while\u5faa\u73af\u63a7\u5236\u8bed\u53e5;<\/li>\n
    • for\u5faa\u73af\u63a7\u5236\u8bed\u53e5<\/li>\n<\/ul>\n
      public class Boolean01 {    \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/\u6f14\u793a\u5224\u65ad\u6210\u7ee9\u662f\u5426\u901a\u8fc7\u7684\u6848\u4f8b     \/\/\u5b9a\u4e49\u4e00\u4e2a\u5e03\u5c14\u53d8\u91cf      boolean isPass = true;\/\/        if(isPass == true) {            System.out.println("\u8003\u8bd5\u901a\u8fc7\uff0c\u606d\u559c");        } else {            System.out.println("\u8003\u8bd5\u6ca1\u6709\u901a\u8fc7\uff0c\u4e0b\u6b21\u52aa\u529b");        }   }}<\/code><\/pre>\n
      \u6570\u636e\u7c7b\u578b\u8f6c\u6362<\/h3>\n
      \u81ea\u52a8\u7c7b\u578b\u8f6c\u6362<\/h5>\n
      \"image-20220109141755192\"<\/div><\/p>\n
      public class AutoConvert {  \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/\u6f14\u793a\u81ea\u52a8\u8f6c\u6362        int num = 'a';\/\/ok char -> int     double d1 = 80; \/\/ok int -> double       System.out.println(num);\/\/97        System.out.println(d1);\/\/80.0   }}<\/code><\/pre>\n
      \u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\u7ec6\u8282<\/h6>\n
      1\uff1a \u6709\u591a\u79cd\u7c7b\u578b\u7684\u6570\u636e\u6df7\u5408\u8fd0\u7b97\u65f6\uff0c\u7cfb\u7edf\u9996\u5148\u81ea\u52a8\u5c06\u6240\u6709\u6570\u636e\u8f6c\u6362\u6210\u5bb9\u91cf\u6700\u5927\u7684\u90a3\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u7136\u540e\u518d\u8fdb\u884c\u8ba1\u7b972: \u5f53\u6211\u4eec\u628a\u7cbe\u5ea6(\u5bb9\u91cf)\u5927 \u7684\u6570\u636e\u7c7b\u578b\u8d4b\u503c\u7ed9\u7cbe\u5ea6(\u5bb9\u91cf)\u5c0f \u7684\u6570\u636e\u7c7b\u578b\u65f6\uff0c\u5c31\u4f1a\u62a5\u9519\uff0c\u53cd\u4e4b\u5c31\u4f1a\u8fdb\u884c\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\u30023: (byte, short) \u548c char\u4e4b\u95f4\u4e0d\u4f1a\u76f8\u4e92\u81ea\u52a8\u8f6c\u63624: byte\uff0cshort\uff0cchar  \u4ed6\u4eec\u4e09\u8005\u53ef\u4ee5\u8ba1\u7b97\uff0c\u5728\u8ba1\u7b97\u65f6\u9996\u5148\u8f6c\u6362\u4e3aint\u7c7b\u578b5.boolean\u4e0d\u53c2\u4e0e\u8f6c\u63626.\u81ea\u52a8\u63d0\u5347\u539f\u5219\uff1a\u8868\u8fbe\u5f0f\u7ed3\u679c\u7684\u7c7b\u578b\u81ea\u52a8\u63d0\u5347\u4e3a \u64cd\u4f5c\u6570\u4e2d\u6700\u5927\u7684\u7c7b\u578b<\/code><\/pre>\n
      package chapter03;\/** * Author: fang * Date:   2022-01-09 14:19 \u661f\u671f\u65e5 * Class:  AutoConvertDetail **\/\/\/\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\u7ec6\u8282public class AutoConvertDetail {    \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/\u7ec6\u82821\uff1a \u6709\u591a\u79cd\u7c7b\u578b\u7684\u6570\u636e\u6df7\u5408\u8fd0\u7b97\u65f6\uff0c        \/\/\u7cfb\u7edf\u9996\u5148\u81ea\u52a8\u5c06\u6240\u6709\u6570\u636e\u8f6c\u6362\u6210\u5bb9\u91cf\u6700\u5927\u7684\u90a3\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u7136\u540e\u518d\u8fdb\u884c\u8ba1\u7b97        int n1 = 10; \/\/ok        \/\/float d1 = n1 + 1.1;\/\/\u9519\u8bef n1 + 1.1 => \u7ed3\u679c\u7c7b\u578b\u662f double        \/\/double d1 = n1 + 1.1;\/\/\u5bf9 n1 + 1.1 => \u7ed3\u679c\u7c7b\u578b\u662f double        float d1 = n1 + 1.1F;\/\/\u5bf9 n1 + 1.1 => \u7ed3\u679c\u7c7b\u578b\u662f float        \/\/\u7ec6\u82822: \u5f53\u6211\u4eec\u628a\u7cbe\u5ea6(\u5bb9\u91cf)\u5927 \u7684\u6570\u636e\u7c7b\u578b\u8d4b\u503c\u7ed9\u7cbe\u5ea6(\u5bb9\u91cf)\u5c0f \u7684\u6570\u636e\u7c7b\u578b\u65f6\uff0c        \/\/\u5c31\u4f1a\u62a5\u9519\uff0c\u53cd\u4e4b\u5c31\u4f1a\u8fdb\u884c\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\u3002        \/\/        \/\/int n2 = 1.1;\/\/\u9519\u8bef double -> int        \/\/\u7ec6\u82823: (byte, short) \u548c char\u4e4b\u95f4\u4e0d\u4f1a\u76f8\u4e92\u81ea\u52a8\u8f6c\u6362        \/\/\u5f53\u628a\u5177\u4f53\u6570\u8d4b\u7ed9 byte \u65f6\uff0c(1)\u5148\u5224\u65ad\u8be5\u6570\u662f\u5426\u5728byte\u8303\u56f4\u5185\uff0c\u5982\u679c\u662f\u5c31\u53ef\u4ee5        byte b1 = 10; \/\/\u5bf9  , -128-127        \/\/ int n2 = 1; \/\/n2 \u662fint        \/\/ byte b2 = n2; \/\/\u9519\u8bef\uff0c\u539f\u56e0\uff1a \u5982\u679c\u662f\u53d8\u91cf\u8d4b\u503c\uff0c\u5224\u65ad\u7c7b\u578b        \/\/        \/\/ char c1 = b1; \/\/\u9519\u8bef\uff0c \u539f\u56e0 byte \u4e0d\u80fd\u81ea\u52a8\u8f6c\u6210 char        \/\/        \/\/        \/\/\u7ec6\u82824: byte\uff0cshort\uff0cchar  \u4ed6\u4eec\u4e09\u8005\u53ef\u4ee5\u8ba1\u7b97\uff0c\u5728\u8ba1\u7b97\u65f6\u9996\u5148\u8f6c\u6362\u4e3aint\u7c7b\u578b        byte b2 = 1;        byte b3 = 2;        short s1 = 1;        \/\/short s2 = b2 + s1;\/\/\u9519, b2 + s1 => int        int s2 = b2 + s1;\/\/\u5bf9, b2 + s1 => int        \/\/byte b4 = b2 + b3; \/\/\u9519\u8bef: b2 + b3 => int        \/\/        \/\/boolean \u4e0d\u53c2\u4e0e\u8f6c\u6362        boolean pass = true;        \/\/int num100 = pass;\/\/ boolean \u4e0d\u53c2\u4e0e\u7c7b\u578b\u7684\u81ea\u52a8\u8f6c\u6362        \/\/\u81ea\u52a8\u63d0\u5347\u539f\u5219\uff1a \u8868\u8fbe\u5f0f\u7ed3\u679c\u7684\u7c7b\u578b\u81ea\u52a8\u63d0\u5347\u4e3a \u64cd\u4f5c\u6570\u4e2d\u6700\u5927\u7684\u7c7b\u578b        \/\/\u770b\u4e00\u9053\u9898        byte b4 = 1;        short s3 = 100;        int num200 = 1;        float num300 = 1.1F;        double num500 = b4 + s3 + num200 + num300; \/\/float -> double    }}<\/code><\/pre>\n
      \u5f3a\u5236\u7c7b\u578b\u8f6c\u6362<\/h5>\n
      \u4ecb\u7ecd<\/h6>\n
      \u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\u7684\u9006\u8fc7\u7a0b\uff0c\u5c06\u5bb9\u91cf\u5927\u7684\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u4e3a\u5bb9\u91cf\u5c0f\u7684\u6570\u636e\u7c7b\u578b\u3002\u4f7f\u7528\u65f6\u8981
      \n\u52a0\u4e0a\u5f3a\u5236\u8f6c\u6362\u7b26\uff08\uff09\uff0c\u4f46\u53ef\u80fd\u9020\u6210\u7cbe\u5ea6\u964d\u4f4e\u6216\u6ea2\u51fa,\u683c\u5916\u8981\u6ce8\u610f\u3002<\/p>\n
      \u6f14\u793a<\/h6>\n
      package chapter03;\/** * Author: fang * Date:   2022-01-09 14:31 \u661f\u671f\u65e5 * Class:  ForceConvert **\/public class ForceConvert {    public static void main(String[] args) {        \/\/\u6f14\u793a\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362        int n1 = (int)1.9;        System.out.println("n1=" + n1);\/\/1, \u9020\u6210\u7cbe\u5ea6\u635f\u5931        int n2 = 2000;        byte b1 = (byte)n2;        System.out.println("b1=" + b1);\/\/\u9020\u6210 \u6570\u636e\u6ea2\u51fa    }}<\/code><\/pre>\n
      \u7ed3\u679c<\/p>\n
      n1=1b1=-48Process finished with exit code 0<\/code><\/pre>\n
      \u7ec6\u8282<\/h6>\n
      \u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u7ec6\u8282\u8bf4\u660e\uff1a1\uff0e\u5f53\u8fdb\u884c\u6570\u636e\u7684\u5927\u5c0f\u4ece \u5927->\u5c0f\uff0c\u5c31\u9700\u8981\u4f7f\u7528\u5230\u5f3a\u5236\u8f6c\u63622. \u5f3a\u8f6c\u7b26\u53f7\u53ea\u9488\u5bf9\u4e8e\u6700\u8fd1\u7684\u64cd\u4f5c\u6570\u6709\u6548\uff0c\u5f80\u5f80\u4f1a\u4f7f\u7528\u5c0f\u62ec\u53f7\u63d0\u5347\u4f18\u5148\u7ea7\/\/int x = (int)10*3.5+6*1.5;int y = (int)(10*3.5+6*1.5);System.out.println(y);3.char\u7c7b\u578b\u53ef\u4ee5\u4fdd\u5b58 int\u7684\u5e38\u91cf\u503c\uff0c\u4f46\u4e0d\u80fd\u4fdd\u5b58int\u7684\u53d8\u91cf\u503c\uff0c\u9700\u8981\u5f3a\u8f6cchar c1 = 100;\/\/okint m = 100;\/\/okchar c2 = m;\/\/\u9519\u8befchar c3 = (char)m;\/\/okSystem.out.printin(c3);\/\/'d'4\uff0ebyte\u548cshort char\u7c7b\u578b\u5728\u8fdb\u884c\u8fd0\u7b97\u65f6\uff0c\u5f53\u505aint\u7c7b\u578b\u5904\u7406\u3002<\/code><\/pre>\n
      public class ForceConvertDetail {   \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {                \/\/\u6f14\u793a\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362      \/\/\u5f3a\u8f6c\u7b26\u53f7\u53ea\u9488\u5bf9\u4e8e\u6700\u8fd1\u7684\u64cd\u4f5c\u6570\u6709\u6548\uff0c\u5f80\u5f80\u4f1a\u4f7f\u7528\u5c0f\u62ec\u53f7\u63d0\u5347\u4f18\u5148\u7ea7        \/\/int x = (int)10*3.5+6*1.5;\/\/\u7f16\u8bd1\u9519\u8bef\uff1a double -> int        int x = (int)(10*3.5+6*1.5);\/\/ (int)44.0 -> 44       System.out.println(x);\/\/44      char c1 = 100; \/\/ok     int m = 100; \/\/ok       \/\/char c2 = m; \/\/\u9519\u8bef     char c3 = (char)m; \/\/ok     System.out.println(c3);\/\/100\u5bf9\u5e94\u7684\u5b57\u7b26, d\u5b57\u7b26  }}<\/code><\/pre>\n
      \u57fa\u672c\u6570\u636e\u7c7b\u578b\u7ec3\u4e60<\/h4>\n
      \u5224\u65ad\u662f\u5426\u80fd\u591f\u901a\u8fc7\u7f16\u8bd11. short s = 12; \/\/ok   s = s-9;\/\/\u9519\u8bef int ->short  2. byte b = 10; \/\/ok   b = b + 11;\/\/\u9519\u8bef int->byte   b = (byte)(b+11)\uff1b\/\/\u6b63\u786e\uff0c\u4f7f\u7528\u5f3a\u8f6c3. char c = 'a'\uff1b\/\/ok   int i = 16;\/\/ok   float d = .314F\uff1b\/\/ok   double result = c + i + d; \/\/ok float->double4. byte b = 16; \/\/ok   short s = 14; \/\/ok   short t = s + b; \/\/\u9519\u8befint ->short<\/code><\/pre>\n
      \u57fa\u672c\u6570\u636e\u7c7b\u578b\u548cString\u7c7b\u578b\u7684\u8f6c\u6362<\/h4>\n
      \u4ecb\u7ecd<\/h5>\n
      \u5728\u7a0b\u5e8f\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u9700\u8981\u5c06\u57fa\u672c\u6570\u636e\u7c7b\u578b\u8f6c\u6210String\u7c7b\u578b\u3002\u6216\u8005\u5c06String\u7c7b\u578b<\/p>\n
      \u8f6c\u6210\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/p>\n
      \u57fa\u672c\u7c7b\u578b\u8f6cString\u7c7b\u578b<\/p>\n
      \u8bed\u6cd5\uff1a \u5c06\u57fa\u672c\u7c7b\u578b\u7684\u503c+\u201c\u201d \u5373\u53ef<\/p>\n
      String\u7c7b\u578b\u8f6c\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/p>\n
      \u8bed\u6cd5\uff1a\u901a\u8fc7\u57fa\u672c\u7c7b\u578b\u7684\u5305\u88c5\u7c7b\u8c03\u7528parseXX\u65b9\u6cd5\u5373\u53ef<\/p>\n
      \u6f14\u793a<\/h5>\n
      public class StringToBasic {    \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {                \/\/\u57fa\u672c\u6570\u636e\u7c7b\u578b->String     int n1 = 100;       float f1 = 1.1F;        double d1 = 4.5;        boolean b1 = true;      String s1 = n1 + "";      String s2 = f1 + "";      String s3 = d1 + "";      String s4 = b1 + "";      System.out.println(s1 + " " + s2 + " " + s3 + " " + s4);      \/\/String->\u5bf9\u5e94\u7684\u57fa\u672c\u6570\u636e\u7c7b\u578b      String s5 = "123";        \/\/\u4f1a\u5728OOP \u8bb2\u5bf9\u8c61\u548c\u65b9\u6cd5\u7684\u65f6\u5019\u56de\u8be6\u7ec6        \/\/\u89e3\u8bfb \u4f7f\u7528 \u57fa\u672c\u6570\u636e\u7c7b\u578b\u5bf9\u5e94\u7684\u5305\u88c5\u7c7b\uff0c\u7684\u76f8\u5e94\u65b9\u6cd5\uff0c\u5f97\u5230\u57fa\u672c\u6570\u636e\u7c7b\u578b     int num1 = Integer.parseInt(s5);        double num2 = Double.parseDouble(s5);       float num3 = Float.parseFloat(s5);      long num4 = Long.parseLong(s5);     byte num5 = Byte.parseByte(s5);     boolean b = Boolean.parseBoolean("true");     short num6 = Short.parseShort(s5);      System.out.println("===================");        System.out.println(num1);\/\/123      System.out.println(num2);\/\/123.0        System.out.println(num3);\/\/123.0        System.out.println(num4);\/\/123      System.out.println(num5);\/\/123      System.out.println(num6);\/\/123      System.out.println(b);\/\/true        \/\/\u600e\u4e48\u628a\u5b57\u7b26\u4e32\u8f6c\u6210\u5b57\u7b26char -> \u542b\u4e49\u662f\u6307 \u628a\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\u5f97\u5230        \/\/\u89e3\u8bfb  s5.charAt(0) \u5f97\u5230 s5\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26 '1'     System.out.println(s5.charAt(0));           }}<\/code><\/pre>\n
      \u6ce8\u610f\u4e8b\u9879<\/h5>\n
      1.\u5728\u5c06String\u7c7b\u578b \u8f6c\u6210\u57fa\u672c\u6570\u636e\u7c7b\u578b\u65f6\uff0c\u8981 \u786e\u4fddString\u7c7b\u578b\u80fd\u591f\u8f6c\u6210\u6709\u6548\u7684\u6570\u636e\uff0c<\/p>\n
      \u6bd4\u5982 \u6211\u4eec\u53ef\u4ee5\u628a \u201c123\u201d \u8f6c\u6210\u6574\u6570\uff0c\u4f46\u662f\u4e0d\u80fd\u628a \u201chello\u201d \u8f6c\u6210\u4e00\u4e2a\u6574\u6570<\/p>\n
      2.\u5982\u679c\u683c\u5f0f\u4e0d\u6b63\u786e\uff0c\u5c31\u4f1a\u629b\u51fa\u5f02\u5e38\uff0c\u7a0b\u5e8f\u5c31\u4f1a\u7ec8\u6b62\uff0c\u8fd9\u4e2a\u95ee\u9898\u5728\u5f02\u5e38\u7ae0\u8282\u5904\u7406<\/p>\n
      \u672c\u7ae0\u4f5c\u4e1a<\/h3>\n
      \"image-20220109145854861\"<\/div><\/p>\n
      public class Homework01 {   \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {                int n1;        n1 = 13;        int n2;        n2 = 17;        int n3;        n3 = n1 + n2;        System.out.println("n3 = " + n3);\/\/30        int n4 = 38;        int n5 = n4 - n3;        System.out.println("n5 = " + n5);\/\/8    }}<\/code><\/pre>\n
      package chapter03;\/** * Author: fang * Date:   2022-01-09 15:01 \u661f\u671f\u65e5 * Class:  Homework **\/public class Homework02 {    public static void main(String[] args) {        \/\/\u4f7f\u7528char\u7c7b\u578b \u5206\u522b\u4fdd\u5b58 \\n \\t \\r  \\\\ 1 2 3 \u7b49\u5b57\u7b26 \u5e76\u6253\u5370\u8f93\u51fa        char c1 = '\\n';        char c2 = '\\t';        char c3 = '\\r';        char c4 = '\\\\';        char c5 = '1';        char c6 = '2';        char c7 = '3';        System.out.println(c1);        System.out.println(c2);        System.out.println(c3);        System.out.println(c4);        System.out.println(c5);        System.out.println(c6);        System.out.println(c7);    }}<\/code><\/pre>\n
      public class Homework03 {   \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/\u7f16\u7a0b\uff0c\u4fdd\u5b58\u4e24\u672c\u4e66\u540d\uff0c\u7528+\u62fc\u63a5\uff0c\u770b\u6548\u679c\u3002\u4fdd\u5b58\u4e24\u4e2a\u6027\u522b\uff0c        \/\/\u7528\u52a0\u53f7\u62fc\u63a5\uff0c\u770b\u6548\u679c\u3002\u4fdd\u5b58\u4e24\u672c\u4e66\u4ef7\u683c\uff0c\u7528\u52a0\u53f7\u62fc\u63a5\uff0c\u770b\u6548\u679c               String book1 = "\u5929\u9f99\u516b\u90e8";        String book2 = "\u7b11\u50b2\u6c5f\u6e56";        System.out.println(book1 + book2);\/\/\u5929\u9f99\u516b\u90e8\u7b11\u50b2\u6c5f\u6e56        \/\/\u6027\u522b\u5e94\u8be5\u4f7f\u7528char\u4fdd\u5b58      char c1 = '\u7537';        char c2 = '\u5973';        System.out.println(c1 + c2);\/\/\u5f97\u5230  \u7537 \u5b57\u7b26\u7801\u503c + \u5973 \u5b57\u7b26\u7801\u503c       \/\/\u4fdd\u5b58\u4e24\u672c\u4e66\u4ef7\u683c       double price1 = 123.56;     double price2 = 100.11;     System.out.println(price1 + price2);\/\/\u5c31\u662f 123.56+100.11  }}<\/code><\/pre>\n
      public class Homework04 {   \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/*       \u59d3\u540d \u5e74\u9f84  \u6210\u7ee9  \u6027\u522b  \u7231\u597d      xx      xx  xx  xx  xx      \u8981\u6c42\uff1a     1) \u7528\u53d8\u91cf\u5c06\u59d3\u540d\u3001\u5e74\u9f84\u3001\u6210\u7ee9\u3001\u6027\u522b\u3001\u7231\u597d\u5b58\u50a8     2) \u4f7f\u7528+      3) \u6dfb\u52a0\u9002\u5f53\u7684\u6ce8\u91ca      4) \u6dfb\u52a0\u8f6c\u4e49\u5b57\u7b26, \u4f7f\u7528\u4e00\u6761\u8bed\u53e5\u8f93\u51fa      *\/     \/\/\u59d3\u540d        String name = "jack";     int age = 20;       double score = 80.9;        char gender = '\u7537';        String hobby = "\u6253\u7bee\u7403";     \/\/\u8f93\u51fa\u4e86\u4fe1\u606f, \u53ef\u4ee5\u4f7f\u7528\u6362\u884c     System.out.println("\u59d3\u540d\\t\u5e74\u9f84\\t\u6210\u7ee9\\t\u6027\u522b\\t\u7231\u597d\\n" + name + "\\t"             + age + "\\t" + score + "\\t" + gender + "\\t" + hobby); }}<\/code><\/pre>\n
      \u8fd0\u7b97\u7b26<\/h2>\n
      \u8fd0\u7b97\u7b26\u4ecb\u7ecd<\/h3>\n
      \u8fd0\u7b97\u7b26\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u7b26\u53f7\uff0c\u7528\u4ee5\u8868\u793a\u6570\u636e\u7684\u8fd0\u7b97\u3001\u8d4b\u503c\u548c\u6bd4\u8f83\u7b49\u3002<\/p>\n
        \n
      1. \u7b97\u672f\u8fd0\u7b97\u7b26<\/li>\n
      2. \u8d4b\u503c\u8fd0\u7b97\u7b26<\/li>\n
      3. \u5173\u7cfb\u8fd0\u7b97[\u5317\u8f83\u8fd0\u7b97\u7b26]<\/li>\n
      4. \u903b\u8f91\u8fd0\u7b97\u7b26<\/li>\n
      5. \u4f4d\u8fd0\u7b97\u7b26 [\u9700\u8981\u4e8c\u8fdb\u5236\u57fa\u7840]<\/li>\n
      6. \u4e09\u5143\u8fd0\u7b97\u7b26<\/li>\n<\/ol>\n
        \u7b97\u672f\u8fd0\u7b97\u7b26<\/h3>\n
        \u7b97\u672f\u8fd0\u7b97\u7b26\u662f\u5bf9\u6570\u503c\u7c7b\u578b\u7684\u53d8\u91cf\u8fdb\u884c\u8fd0\u7b97\u7684\uff0c\u5728Java\u7a0b\u5e8f\u4e2d\u4f7f\u7528\u7684\u975e\u5e38\u591a\u3002<\/p>\n
        \"image-20220109210942122\"<\/div><\/p>\n
        \u6848\u4f8b\u6f14\u793a<\/p>\n
        \/** * \u6f14\u793a\u7b97\u672f\u8fd0\u7b97\u7b26\u7684\u4f7f\u7528  *\/public class ArithmeticOperator {   \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/ \/\u4f7f\u7528      System.out.println(10 \/ 4); \/\/\u4ece\u6570\u5b66\u6765\u770b\u662f2.5, java\u4e2d 2        System.out.println(10.0 \/ 4); \/\/java\u662f2.5        \/\/ \u6ce8\u91ca\u5feb\u6377\u952e ctrl + \/, \u518d\u6b21\u8f93\u5165 ctrl + \/ \u53d6\u6d88\u6ce8\u91ca       double d = 10 \/ 4;\/\/java\u4e2d10 \/ 4 = 2, 2=>2.0      System.out.println(d);\/\/ \u662f2.0       \/\/ % \u53d6\u6a21 ,\u53d6\u4f59     \/\/ \u5728 % \u7684\u672c\u8d28 \u770b\u4e00\u4e2a\u516c\u5f0f!!!! a % b = a - a \/ b * b      \/\/ -10 % 3 => -10 - (-10) \/ 3 * 3 = -10 + 9 = -1     \/\/ 10 % -3 = 10 - 10 \/ (-3) * (-3) = 10 - 9 = 1     \/\/ -10 % -3 =  (-10) - (-10) \/ (-3) * (-3) = -10 + 9 = -1       System.out.println(10 % 3); \/\/1     System.out.println(-10 % 3); \/\/ -1      System.out.println(10 % -3); \/\/1        System.out.println(-10 % -3);\/\/-1       \/\/++\u7684\u4f7f\u7528     \/\/      int i = 10;     i++;\/\/\u81ea\u589e \u7b49\u4ef7\u4e8e i = i + 1; => i = 11        ++i;\/\/\u81ea\u589e \u7b49\u4ef7\u4e8e i = i + 1; => i = 12        System.out.println("i=" + i);\/\/12     \/*      \u4f5c\u4e3a\u8868\u8fbe\u5f0f\u4f7f\u7528        \u524d++\uff1a++i\u5148\u81ea\u589e\u540e\u8d4b\u503c        \u540e++\uff1ai++\u5148\u8d4b\u503c\u540e\u81ea\u589e        *\/     int j = 8;      \/\/int k = ++j; \/\/\u7b49\u4ef7 j=j+1;k=j;      int k = j++; \/\/ \u7b49\u4ef7 k =j;j=j+1;      System.out.println("k=" + k + "j=" + j);\/\/8 9   }}<\/code><\/pre>\n
        \u9762\u8bd5\u9898<\/p>\n
        \"image-20220109211147343\"<\/div>
        \n
        \"image-20220109211516886\"<\/div><\/p>\n
        \/\/\u7ec3\u4e60public class ArithmeticOperatorExercise01 {     \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {                \/\/ int i = 1;\/\/i->1      \/\/ i = i++; \/\/\u89c4\u5219\u4f7f\u7528\u4e34\u65f6\u53d8\u91cf: (1) temp=i;(2) i=i+1;(3)i=temp;     \/\/ System.out.println(i); \/\/ 1      \/\/ int i=1;     \/\/ i=++i; \/\/\u89c4\u5219\u4f7f\u7528\u4e34\u65f6\u53d8\u91cf: (1) i=i+1;(2) temp=i;(3)i=temp;       \/\/ System.out.println(i); \/\/2       \/\/      \/\/ \u6d4b\u8bd5\u8f93\u51fa     int i1 = 10;        int i2 = 20;        int i = i1++;        System.out.print("i="+i);\/\/10        System.out.println("i2="+i2);\/\/20        i = --i2;         System.out.print("i="+i);\/\/19        System.out.println("i2="+i2);\/\/19 }}<\/code><\/pre>\n
        \u8bfe\u5802\u7ec3\u4e60<\/p>\n
        \"image-20220109211625765\"<\/div><\/p>\n
        package chapter04;\/** * Author: fang * Date:   2022-01-09 21:17 \u661f\u671f\u65e5 * Class:  ArithmeticOperatorExercise02 **\/public class ArithmeticOperatorExercise02 {    public static void main(String[] args) {        \/\/1.\u9700\u6c42:        \/\/\u5047\u5982\u8fd8\u670959\u5929\u653e\u5047\uff0c\u95ee\uff1a\u5408xx\u4e2a\u661f\u671f\u96f6xx\u5929        \/\/2.\u601d\u8def\u5206\u6790        \/\/(1) \u4f7f\u7528int \u53d8\u91cf days \u4fdd\u5b58 \u5929\u6570        \/\/(2) \u4e00\u4e2a\u661f\u671f\u662f7\u5929 \u661f\u671f\u6570weeks\uff1a days \/ 7 \u96f6xx\u5929leftDays days % 7        \/\/(3) \u8f93\u51fa        int days = 14;        int week = (int)(days \/ 7) ;        int last = days % 7 ;        System.out.println(days +"\u5929 \u5408\u8ba1 "+ week +"\u661f\u671f \u96f6 " + last + " \u5929" );        \/\/1.\u9700\u6c42        \/\/\u5b9a\u4e49\u4e00\u4e2a\u53d8\u91cf\u4fdd\u5b58\u534e\u6c0f\u6e29\u5ea6\uff0c\u534e\u6c0f\u6e29\u5ea6\u8f6c\u6362\u6444\u6c0f\u6e29\u5ea6\u7684\u516c\u5f0f\u4e3a        \/\/\uff1a5\/9*(\u534e\u6c0f\u6e29\u5ea6-100),\u8bf7\u6c42\u51fa\u534e\u6c0f\u6e29\u5ea6\u5bf9\u5e94\u7684\u6444\u6c0f\u6e29\u5ea6        \/\/        \/\/2\u601d\u8def\u5206\u6790        \/\/(1) \u5148\u5b9a\u4e49\u4e00\u4e2adouble huaShi \u53d8\u91cf\u4fdd\u5b58 \u534e\u6c0f\u6e29\u5ea6        \/\/(2) \u6839\u636e\u7ed9\u51fa\u7684\u516c\u5f0f\uff0c\u8fdb\u884c\u8ba1\u7b97\u5373\u53ef5\/9*(\u534e\u6c0f\u6e29\u5ea6-100)        \/\/    \u8003\u8651\u6570\u5b66\u516c\u5f0f\u548cjava\u8bed\u8a00\u7684\u7279\u6027        \/\/(3) \u5c06\u5f97\u5230\u7684\u7ed3\u679c\u4fdd\u5b58\u5230double sheShi        double huashi = 111.2;        double sheshi = 5.0 \/ 9 * (huashi - 100);        System.out.println( "\u534e\u6c0f\u6e29\u5ea6 "+ huashi +" \u5bf9\u5e94\u7684\u6444\u6c0f\u6e29\u5ea6\u4e3a \uff1a" + sheshi);    }}<\/code><\/pre>\n
        \u5173\u7cfb\u8fd0\u7b97\u7b26<\/h3>\n
        \u4ecb\u7ecd
        \n1.\u5173\u7cfb\u8fd0\u7b97\u7b26\u7684\u7ed3\u679c\u90fd\u662fboolean\u578b\uff0c\u4e5f\u5c31\u662f\u8981\u4e48\u662ftrue\uff0c\u8981\u4e48\u662ffalse<\/p>\n
        2.\u5173\u7cfb\u8868\u8fbe\u5f0f \u7ecf\u5e38\u7528\u5728 if\u7ed3\u6784\u7684\u6761\u4ef6\u4e2d\u6216\u5faa\u73af\u7ed3\u6784\u7684\u6761\u4ef6\u4e2d<\/p>\n
        \"image-20220109212917164\"<\/div><\/p>\n
        \u6f14\u793a<\/p>\n
        \/\/\u6f14\u793a\u5173\u7cfb\u8fd0\u7b97\u7b26\u7684\u4f7f\u7528\/\/public class RelationalOperator {     \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        int a = 9;  \/\/\u8001\u97e9\u63d0\u793a:  \u5f00\u53d1\u4e2d\uff0c\u4e0d\u53ef\u4ee5\u4f7f\u7528  a, b        int b = 8;      System.out.println(a > b); \/\/T       System.out.println(a >= b);  \/\/T     System.out.println(a <= b); \/\/F      System.out.println(a < b);\/\/F        System.out.println(a == b); \/\/F     System.out.println(a != b); \/\/T     boolean flag = a > b; \/\/T        System.out.println("flag=" + flag);   }}<\/code><\/pre>\n
        \u25cf \u7ec6\u8282\u8bf4\u660e
        \n1)\u5173\u7cfb\u8fd0\u7b97\u7b26\u7684\u7ed3\u679c\u90fd\u662fboolean\u578b\uff0c\u4e5f\u5c31\u662f\u8981\u4e48\u662ftrue,\u8981\u4e48\u662ffalse\u3002
        \n2)\u5173\u7cfb\u8fd0\u7b97\u7b26\u7ec4\u6210\u7684\u8868\u8fbe\u5f0f\uff0c\u6211\u4eec\u79f0\u4e3a\u5173\u7cfb\u8868\u8fbe\u5f0f<\/strong>\u3002a > b
        \n3)\u6bd4\u8f83\u8fd0\u7b97\u7b26"=="\u4e0d\u80fd\u8bef\u5199\u6210"="<\/p>\n
        \u903b\u8f91\u8fd0\u7b97\u7b26<\/h3>\n
        \u25cf \u4ecb\u7ecd
        \n\u7528\u4e8e\u8fde\u63a5\u591a\u4e2a\u6761\u4ef6\uff08\u591a\u4e2a\u5173\u7cfb\u8868\u8fbe\u5f0f\uff09\uff0c\u6700\u7ec8\u7684\u7ed3\u679c\u4e5f\u662f\u4e00\u4e2aboolean\u503c\u3002<\/p>\n
        \"image-20220109213443808\"<\/div>
        \n
        \"image-20220109213516328\"<\/div>
        \n
        \"image-20220109213649434\"<\/div><\/p>\n
        \/** * \u6f14\u793a\u903b\u8f91\u8fd0\u7b97\u7b26\u7684\u4f7f\u7528 *\/public class LogicOperator01 {   \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/&&\u77ed\u8def\u4e0e  \u548c & \u6848\u4f8b\u6f14\u793a       int age = 50;       if(age > 20 && age < 90) {            System.out.println("ok100");      }       \/\/&\u903b\u8f91\u4e0e\u4f7f\u7528        if(age > 20 & age < 90) {         System.out.println("ok200");      }       \/\/\u533a\u522b        int a = 4;      int b = 9;      \/\/\u5bf9\u4e8e&&\u77ed\u8def\u4e0e\u800c\u8a00\uff0c\u5982\u679c\u7b2c\u4e00\u4e2a\u6761\u4ef6\u4e3afalse ,\u540e\u9762\u7684\u6761\u4ef6\u4e0d\u518d\u5224\u65ad        \/\/\u5bf9\u4e8e&\u903b\u8f91\u4e0e\u800c\u8a00\uff0c\u5982\u679c\u7b2c\u4e00\u4e2a\u6761\u4ef6\u4e3afalse ,\u540e\u9762\u7684\u6761\u4ef6\u4ecd\u7136\u4f1a\u5224\u65ad        if(a < 1 & ++b < 50) {            System.out.println("ok300");      }       System.out.println("a=" + a + " b=" + b);\/\/ 4 10            }}<\/code><\/pre>\n
        \"image-20220109213846917\"<\/div><\/p>\n
        \/\/\u6f14\u793a| || \u4f7f\u7528public class LogicOperator02 {   \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/||\u77ed\u8def\u6216  \u548c |\u903b\u8f91\u6216 \u6848\u4f8b\u6f14\u793a        \/\/|| \u89c4\u5219: \u4e24\u4e2a\u6761\u4ef6\u4e2d\u53ea\u8981\u6709\u4e00\u4e2a\u6210\u7acb\uff0c\u7ed3\u679c\u4e3atrue,\u5426\u5219\u4e3afalse      \/\/| \u89c4\u5219: \u4e24\u4e2a\u6761\u4ef6\u4e2d\u53ea\u8981\u6709\u4e00\u4e2a\u6210\u7acb\uff0c\u7ed3\u679c\u4e3atrue,\u5426\u5219\u4e3afalse       int age = 50;       if(age > 20 || age < 30) {            System.out.println("ok100");      }       \/\/&\u903b\u8f91\u4e0e\u4f7f\u7528        if(age > 20 | age < 30) {         System.out.println("ok200");      }       \/\/\u770b\u770b\u533a\u522b      \/\/(1)||\u77ed\u8def\u6216\uff1a\u5982\u679c\u7b2c\u4e00\u4e2a\u6761\u4ef6\u4e3atrue\uff0c        \/\/\u5219\u7b2c\u4e8c\u4e2a\u6761\u4ef6\u4e0d\u4f1a\u5224\u65ad\uff0c\u6700\u7ec8\u7ed3\u679c\u4e3atrue\uff0c\u6548\u7387\u9ad8      \/\/(2)| \u903b\u8f91\u6216\uff1a\u4e0d\u7ba1\u7b2c\u4e00\u4e2a\u6761\u4ef6\u662f\u5426\u4e3atrue\uff0c\u7b2c\u4e8c\u4e2a\u6761\u4ef6\u90fd\u8981\u5224\u65ad\uff0c\u6548\u7387\u4f4e     int a = 4;      int b = 9;      if( a > 1 || ++b > 4) { \/\/ \u53ef\u4ee5\u6362\u6210 | \u6d4b\u8bd5          System.out.println("ok300");      }       System.out.println("a=" + a + " b=" + b); \/\/4 10    }}<\/code><\/pre>\n
        \"image-20220109213952125\"<\/div><\/p>\n
        \/\/!\u548c^\u6848\u4f8b\u6f14\u793apublic class InverseOperator {     \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/! \u64cd\u4f5c\u662f\u53d6\u53cd T->F  , F -> T      System.out.println(60 > 20); \/\/T     System.out.println(!(60 > 20)); \/\/F      \/\/a^b: \u53eb\u903b\u8f91\u5f02\u6216\uff0c\u5f53 a \u548c b \u4e0d\u540c\u65f6\uff0c\u5219\u7ed3\u679c\u4e3atrue, \u5426\u5219\u4e3afalse     boolean b = (10 > 1) ^ ( 3 > 5);      System.out.println("b=" + b);\/\/T  }}<\/code><\/pre>\n
        \u7ec3\u4e60\u9898<\/p>\n
        \"image-20220109214143716\"<\/div>
        \n
        \"image-20220109214333362\"<\/div>
        \n
        \"image-20220109214420303\"<\/div><\/p>\n
        \u9a8c\u8bc1<\/p>\n
        \/\/\u9a8c\u8bc1public class Test {     \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/ int x = 5;       \/\/ int y=5;     \/\/ if(x++==6 & ++y==6){ \/\/\u903b\u8f91\u4e0e       \/\/  x = 11;     \/\/ }        \/\/ System.out.println("x="+x+",y="+y);      \/\/ \/\/6, 6       \/\/ int x = 5,y = 5;     \/\/ if(x++==6 && ++y==6){        \/\/  x = 11;     \/\/ }        \/\/ System.out.println("x="+x+",y="+y);      \/\/ \/\/6, 5       \/\/      \/\/ int x = 5,y = 5;     \/\/ if(x++==5 | ++y==5){     \/\/  x =11;      \/\/ }        \/\/ System.out.println("x="+x+",y="+y);      \/\/11, 6     \/\/      \/\/ int x = 5,y = 5;     \/\/ if(x++==5 || ++y==5){        \/\/  x =11;      \/\/ }        \/\/ System.out.println("x="+x+",y="+y);      \/\/11, 5     \/\/      \/\/      boolean x=true;     boolean y=false;        short z=46;     if( (z++==46)&& (y=true) )   z++;       if((x=false) || (++z==49))  z++;        System. out.println("z="+z); \/\/50     }}<\/code><\/pre>\n
        \u8d4b\u503c\u8fd0\u7b97\u7b26<\/h3>\n
        \u25cf\u4ecb\u7ecd
        \n\u8d4b\u503c\u8fd0\u7b97\u7b26\u5c31\u662f\u5c06\u67d0\u4e2a\u8fd0\u7b97\u540e\u7684\u503c,\u8d4b\u7ed9\u6307\u5b9a\u7684\u53d8\u91cf\u3002
        \n\u25cf \u8d4b\u503c\u8fd0\u7b97\u7b26\u7684\u5206\u7c7b
        \n\u57fa\u672c\u8d4b\u503c\u8fd0\u7b97\u7b26 =   int a = 100;
        \n\u590d\u5408\u8d4b\u503c\u8fd0\u7b97\u7b26
        \n+=\uff0c -=\uff0c\/=\uff0c*=\uff0c%= \u7b49<\/p>\n
        \u91cd\u70b9\u8bb2\u89e3\u4e00\u4e2a += \uff0c<\/p>\n
        \u5176\u5b83\u7684\u4f7f\u7528\u662f\u4e00\u4e2a\u9053\u7406
        \n.
        \na += b; [\u7b49\u4ef7 \uff1f  a = a + b; ]
        \na -= b; [\u7b49\u4ef7\uff1f a=  a - b]<\/p>\n
        \"image-20220109214903693\"<\/div><\/p>\n
        \/\/\u6f14\u793a\u8d4b\u503c\u8fd0\u7b97\u7b26\u7684\u4f7f\u7528public class AssignOperator {   \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        int n1 = 10;        n1 += 4;\/\/ n1 = n1 + 4;     System.out.println(n1); \/\/ 14       n1 \/= 3;\/\/ n1 = n1 \/ 3;\/\/4      System.out.println(n1); \/\/ 4        \/\/\u590d\u5408\u8d4b\u503c\u8fd0\u7b97\u7b26\u4f1a\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362        byte b = 3;     b += 2; \/\/ \u7b49\u4ef7 b = (byte)(b + 2);        b++; \/\/ b = (byte)(b+1);            }}<\/code><\/pre>\n
        \u4e09\u5143\u8fd0\u7b97\u7b26<\/h3>\n
        \u25cf\u57fa\u672c\u8bed\u6cd5
        \n\u6761\u4ef6\u8868\u8fbe\u5f0f\uff1f\u8868\u8fbe\u5f0f1:\u8868\u8fbe\u5f0f2;
        \n1.\u5982\u679c\u6761\u4ef6\u8868\u8fbe\u5f0f\u4e3atrue,\u8fd0\u7b97\u540e\u7684\u7ed3\u679c\u662f\u8868\u8fbe\u5f0f1\uff1b
        \n2.\u5982\u679c\u6761\u4ef6\u8868\u8fbe\u5f0f\u4e3afalse,\u8fd0\u7b97\u540e\u7684\u7ed3\u679c\u662f\u8868\u8fbe\u5f0f2\uff1b<\/p>\n
        \u25cf \u6848\u4f8b\u6f14\u793a
        \nint a = 10;
        \nint b = 99;
        \nint result = :<\/p>\n
        \/\/\u4e09\u5143\u8fd0\u7b97\u7b26\u4f7f\u7528public class TernaryOperator {     \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        int a = 10;     int b = 99;     \/\/ \u89e3\u8bfb       \/\/ 1. a > b \u4e3a false      \/\/ 2. \u8fd4\u56de b--, \u5148\u8fd4\u56de b\u7684\u503c,\u7136\u540e\u5728 b-1       \/\/ 3. \u8fd4\u56de\u7684\u7ed3\u679c\u662f99      int result = a > b ? a++ : b--;      System.out.println("result=" + result);       System.out.println("a=" + a);     System.out.println("b=" + b); }}<\/code><\/pre>\n
        \u7ec6\u8282<\/p>\n
          \n
        1. \u8868\u8fbe\u5f0f1\u548c\u8868\u8fbe\u5f0f2 \u8981\u4e3a\u53ef\u4ee5\u8d4b\u7ed9\u63a5\u53d7\u53d8\u91cf\u7684\u7c7b\u578b\uff08\u6216\u8005\u53ef\u4ee5\u81ea\u52a8\u8f6c\u6362\uff09<\/li>\n
        2. \u4e09\u5143\u8fd0\u7b97\u7b26\u53ef\u4ee5\u8f6c\u6210if--else \u8bed\u53e5<\/li>\n<\/ol>\n
          \/\/\u4e09\u5143\u8fd0\u7b97\u7b26\u7ec6\u8282public class TernaryOperatorDetail {   \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/\u8868\u8fbe\u5f0f1\u548c\u8868\u8fbe\u5f0f2\u8981\u4e3a\u53ef\u4ee5\u8d4b\u7ed9\u63a5\u6536\u53d8\u91cf\u7684\u7c7b\u578b        \/\/(\u6216\u53ef\u4ee5\u81ea\u52a8\u8f6c\u6362\/\u6216\u8005\u5f3a\u5236\u8f6c\u6362)      int a = 3;      int b = 8;      int c = a > b ? (int)1.1 : (int)3.4;\/\/\u53ef\u4ee5\u7684        double d = a > b ? a : b + 3;\/\/\u53ef\u4ee5\u7684\uff0c\u6ee1\u8db3 int -> double   }}<\/code><\/pre>\n
          \"image-20220109215728716\"<\/div><\/p>\n
          public class TernaryOperatorExercise {  \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/\u6848\u4f8b\uff1a\u5b9e\u73b0\u4e09\u4e2a\u6570\u7684\u6700\u5927\u503c      int n1 = 553;       int n2 = 33;        int n3 = 123;       \/\/\u601d\u8def        \/\/1. \u5148\u5f97\u5230 n1 \u548c n2 \u4e2d\u6700\u5927\u6570 , \u4fdd\u5b58\u5230 max1        \/\/2. \u7136\u540e\u518d \u6c42\u51fa max1 \u548c  n3\u4e2d\u7684\u6700\u5927\u6570\uff0c\u4fdd\u5b58\u5230 max2                int max1 = n1 > n2 ? n1 : n2;        int max2 = max1 > n3 ? max1 : n3;        System.out.println("\u6700\u5927\u6570=" + max2);        \/\/\u4f7f\u7528\u4e00\u6761\u8bed\u53e5\u5b9e\u73b0, \u63a8\u8350\u4f7f\u7528\u4e0a\u9762\u65b9\u6cd5        \/\/\u8001\u5e08\u63d0\u793a: \u540e\u9762\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u66f4\u597d\u65b9\u6cd5,\u6bd4\u5982\u6392\u5e8f       \/\/ int max = (n1 > n2 ? n1 : n2) > n3 ?       \/\/              (n1 > n2 ? n1 : n2) : n3;        \/\/ System.out.println("\u6700\u5927\u6570=" + max);          \/\/      }}<\/code><\/pre>\n
          \u8fd0\u7b97\u7b26\u4f18\u5148\u7ea7<\/h3>\n
          \u8fd0\u7b97\u7b26\u4f18\u5148\u7ea7
          \n1.\u8fd0\u7b97\u7b26\u6709\u4e0d\u540c\u7684\u4f18\u5148\u7ea7\uff0c\u6240\u8c13\u4f18\u5148\u7ea7\u5c31\u662f\u8868\u8fbe\u5f0f\u8fd0\u7b97\u4e2d\u7684\u8fd0\u7b97\u987a\u5e8f\u3002
          \n\u5982\u53f3\u8868\uff0c\u4e0a\u4e00\u884c\u8fd0\u7b97\u7b26\u603b\u4f18\u5148\u4e8e\u4e0b\u4e00\u884c\u3002
          \n2.\u53ea\u6709\u5355\u76ee\u8fd0\u7b97\u7b26\u3001\u8d4b\u503c\u8fd0\u7b97\u7b26\u662f\u4ece\u53f3\u5411\u5de6\u8fd0\u7b97\u7684\u3002<\/p>\n
          \"image-20220109220124961\"<\/div><\/p>\n
          \u6807\u8bc6\u7b26\u7684\u547d\u540d\u89c4\u5219\u548c\u89c4\u8303<\/h3>\n
          \u2022 \u6807\u8bc6\u7b26\u6982\u5ff51\uff0eJava\u5bf9\u5404\u79cd\u53d8\u91cf\u3001\u65b9\u6cd5\u548c\u7c7b\u7b49\u547d\u540d\u65f6\u4f7f\u7528\u7684\u5b57\u7b26\u5e8f\u5217\u79f0\u4e3a\u6807\u8bc6\u7b262. \u51e1\u662f\u81ea\u5df1\u53ef\u4ee5\u8d77\u540d\u5b57\u7684\u5730\u65b9\u90fd\u53eb\u6807\u8bc6\u7b26 int num1 = 90;   \u2022 \u6807\u8bc6\u7b26\u7684\u547d\u540d\u89c4\u5219(\u5fc5\u987b\u9075\u5b88)     1\uff0e\u753126\u4e2a\u82f1\u6587\u5b57\u6bcd\u5927\u5c0f\u5199\uff0c0-9\uff0c_\u6216 $ \u7ec4\u6210  2\uff0e\u6570\u5b57\u4e0d\u53ef\u4ee5\u5f00\u5934\u3002 int 3ab = 1;\/\/\u9519\u8bef  3\uff0e\u4e0d\u53ef\u4ee5\u4f7f\u7528\u5173\u952e\u5b57\u548c\u4fdd\u7559\u5b57\uff0c\u4f46\u80fd\u5305\u542b\u5173\u952e\u5b57\u548c\u4fdd\u7559\u5b57\u3002  4.Java\u4e2d\u4e25\u683c\u533a\u5206\u5927\u5c0f\u5199\uff0c\u957f\u5ea6\u65e0\u9650\u5236\u3002int totalNum = 10; int n = 90;  5.\u6807\u8bc6\u7b26\u4e0d\u80fd\u5305\u542b\u7a7a\u683c\u3002int a b = 90;\/\/\u9519\u8bef<\/code><\/pre>\n
          \"image-20220109221541396\"<\/div><\/p>\n
          \u547d\u4ee4\u89c4\u8303<\/p>\n
          \"image-20220109221625752\"<\/div><\/p>\n
          \u5173\u952e\u5b57<\/h3>\n
          \"image-20220109221651024\"<\/div>
          \n
          \"image-20220109221731579\"<\/div><\/p>\n
          \u4fdd\u7559\u5b57<\/h3>\n
          \u4ecb\u7ecdJava\u4fdd\u7559\u5b57\uff1a\u73b0\u6709Java\u7248\u672c\u5c1a\u672a\u4f7f\u7528\uff0c\u4f46\u4ee5\u540e\u7248\u672c\u53ef\u80fd\u4f1a\u4f5c\u4e3a\u5173\u952e\u5b57\u4f7f\u7528\u3002\u81ea\u5df1\u547d\u540d\u6807\u8bc6\u7b26\u65f6\u8981\u907f\u514d\u4f7f\u7528\u8fd9\u4e9b\u4fdd\u7559\u5b57byValue\u3001cast\u3001future\u3001generic\u3001inner,opeator,outer,rest,var ,goto ,const<\/code><\/pre>\n
          \u8fdb\u5236<\/h3>\n
          \u2022 \u8fdb\u5236\u4ecb\u7ecd\u5bf9\u4e8e\u6574\u6570\uff0c\u6709\u56db\u79cd\u8868\u793a\u65b9\u5f0f\uff1a1\uff0e\u4e8c\u8fdb\u5236\uff1a0,1\uff0c\u6ee12\u8fdb1.\u4ee5Ob\u62160B\u5f00\u5934\u30022\uff0e\u5341\u8fdb\u5236\uff1a0-9\uff0c\u6ee110\u8fdb1\u30023.\u516b\u8fdb\u5236\uff1a0-7\uff0c\u6ee18\u8fdb1.\u4ee5\u6570\u5b570\u5f00\u5934\u8868\u793a\u30024.\u5341\u516d\u8fdb\u5236\uff1a0-9\u53caA(10)-F(15)\uff0c\u6ee116\u8fdb1. \u4ee50x\u62160X\u5f00\u5934\u8868\u793a\u3002\u6b64\u5904\u7684A-F\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u3002<\/code><\/pre>\n
          \/\/\u6f14\u793a\u56db\u79cd\u8fdb\u5236\/\/public class BinaryTest {     \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/n1 \u4e8c\u8fdb\u5236        int n1 = 0b1010;        \/\/n2 10\u8fdb\u5236       int n2 = 1010;      \/\/n3 8\u8fdb\u5236        int n3 = 01010;     \/\/n4 16\u8fdb\u5236       int n4 = 0X10101;       System.out.println("n1=" + n1);       System.out.println("n2=" + n2);       System.out.println("n3=" + n3);       System.out.println("n4=" + n4);       System.out.println(0x23A);  }}<\/code><\/pre>\n
          \"image-20220109222346593\"<\/div>
          \n
          \"image-20220109222532294\"<\/div><\/p>\n
          \u8fdb\u5236\u7684\u8f6c\u6362<\/h3>\n
          win10 \u81ea\u5e26\u8ba1\u7b97\u5668<\/p>\n
          HEX \u5341\u516d\u8fdb\u5236<\/p>\n
          DEC \u5341\u8fdb\u5236<\/p>\n
          OCT \u516b\u8fdb\u5236<\/p>\n
          BIN \u4e8c\u8fdb\u5236<\/p>\n
          \u4e8c\u8fdb\u5236\u8f6c\u5341\u8fdb\u5236<\/h4>\n
          \u89c4\u5219\uff1a\u4ece\u6700\u4f4e\u4f4d(\u53f3\u8fb9)\u5f00\u59cb\uff0c\u5c06\u6bcf\u4e2a\u4f4d\u4e0a\u7684\u6570\u63d0\u53d6\u51fa\u6765\uff0c\u4e58\u4ee52\u7684(\u4f4d\u6570-1)\u6b21\u65b9\uff0c\u7136\u540e\u6c42\u548c\u3002\u6848\u4f8b\uff1a\u8bf7\u5c06 0b1011 \u8f6c\u6210\u5341\u8fdb\u5236\u7684\u6570\u25cf0b1011 =   1 * 2^(1-1) + 1 * 2^(2-1) + 0 * 2^(3-1) + 1 * 2^(4-1)       = 1 + 2 + 0 + 8 = 11<\/code><\/pre>\n
          \u516b\u8fdb\u5236\u8f6c\u5341\u8fdb\u5236<\/h4>\n
          \u89c4\u5219\uff1a\u4ece\u6700\u4f4e\u4f4d(\u53f3\u8fb9)\u5f00\u59cb\uff0c\u5c06\u6bcf\u4e2a\u4f4d\u4e0a\u7684\u6570\u63d0\u53d6\u51fa\u6765\uff0c\u4e58\u4ee58\u7684(\u4f4d\u6570-1)\u6b21\u65b9\u7136\u540e\u6c42\u548c\u3002\u6848\u4f8b\uff1a\u8bf7\u5c06 0234\u8f6c\u6210\u5341\u8fdb\u5236\u7684\u65700234 = 4 * 8^0 + 3 * 8^1 + 2 * 8^2= 4 + 24 + 128 = 156<\/code><\/pre>\n
          \u5341\u516d\u8fdb\u5236\u8f6c\u5341\u8fdb\u5236<\/h4>\n
          \u89c4\u5219\uff1a\u4ece\u6700\u4f4e\u4f4d(\u53f3\u8fb9)\u5f00\u59cb\uff0c\u5c06\u6bcf\u4e2a\u4f4d\u4e0a\u7684\u6570\u63d0\u53d6\u51fa\u6765\uff0c\u4e58\u4ee516\u7684(\u4f4d\u6570-1)\u6b21\u65b9\uff0c\u7136\u540e\u6c42\u548c\u3002\u6848\u4f8b\uff1a\u8bf7\u5c06 0x23A \u8f6c\u6210\u5341\u8fdb\u5236\u7684\u65700x23A = 10 * 16^0 + 3 * 16 ^ 1 + 2* 16^2 = 10 + 48 + 512 = 570<\/code><\/pre>\n
          \u7ec3\u4e60<\/h4>\n
          \"image-20220109223625186\"<\/div><\/p>\n
          \u5341\u8fdb\u5236\u8f6c\u4e8c\u8fdb\u5236<\/h4>\n
          \u89c4\u5219\uff1a\u5c06\u8be5\u6570\u4e0d\u65ad\u9664\u4ee52\uff0c\u76f4\u5230\u5546\u4e3a0\u4e3a\u6b62\uff0c\u7136\u540e\u5c06\u6bcf\u6b65\u5f97\u5230\u7684\u4f59\u6570\u5012\u8fc7\u6765\uff0c\u5c31\u662f\u5bf9\u5e94\u7684\u4e8c\u8fdb\u5236\u3002\u6848\u4f8b:\u8bf7\u5c0634\u8f6c\u6210\u4e8c\u8fdb\u5236 = <\/code><\/pre>\n
          \"image-20220109224015546\"<\/div><\/p>\n
          \u5341\u8fdb\u5236\u8f6c\u516b\u8fdb\u5236<\/h4>\n
          \"image-20220109224051751\"<\/div><\/p>\n
          \u5341\u8fdb\u5236\u8f6c\u5341\u516d\u8fdb\u5236<\/h4>\n
          \"image-20220109224141680\"<\/div><\/p>\n
          \u7ec3\u4e60<\/h4>\n
          \"image-20220109224214162\"<\/div><\/p>\n
          \u4e8c\u8fdb\u5236\u8f6c\u516b\u8fdb\u5236<\/h4>\n
          \"image-20220109224311274\"<\/div><\/p>\n
          \u4e8c\u8fdb\u5236\u8f6c\u5341\u516d\u8fdb\u5236<\/h4>\n
          \"image-20220109224336174\"<\/div><\/p>\n
          \u7ec3\u4e60<\/h4>\n
          \"image-20220109224352641\"<\/div><\/p>\n
          \u516b\u8fdb\u5236\u8f6c\u4e8c\u8fdb\u5236<\/h4>\n
          \"image-20220109224453071\"<\/div><\/p>\n
          \u7701\u7565\u4e86\u9996\u4f4d\u76840<\/p>\n
          ob 010 011 111<\/p>\n
          \u5341\u516d\u8fdb\u5236\u8f6c\u4e8c\u8fdb\u5236<\/h4>\n
          \"image-20220109224605230\"<\/div><\/p>\n
          \u7ec3\u4e60<\/h4>\n
          *
          \"image-20220109224645934\"<\/div>**<\/p>\n
          \u4f4d\u8fd0\u7b97<\/h3>\n
          \u4e8c\u8fdb\u5236\u5728\u8fd0\u7b97\u4e2d\u7684\u8bf4\u660e<\/h3>\n
          \u4e8c\u8fdb\u5236\u5728\u8fd0\u7b97\u4e2d\u7684\u8bf4\u660e1.\u4e8c\u8fdb\u5236\u662f\u90222\u8fdb\u4f4d\u7684\u8fdb\u4f4d\u5236, 0\u30011\u662f\u57fa\u672c\u7b97\u7b26\u30022. \u73b0\u4ee3\u7684\u7535\u5b50\u8ba1\u7b97\u673a\u6280\u672f\u5168\u90e8\u91c7\u7528\u7684\u662f\u4e8c\u8fdb\u5236\uff0c\u56e0\u4e3a\u5b83\u53ea\u4f7f\u7528O\u30011\u4e24\u4e2a\u6570\u5b57\u7b26\u53f7\uff0c\u975e\u5e38\u7b80\u5355\u65b9\u4fbf\uff0c\u6613\u4e8e\u7528\u7535\u5b50\u65b9\u5f0f\u5b9e\u73b0\u3002\u8ba1\u7b97\u673a\u5185\u90e8\u5904\u7406\u7684\u4fe1\u606f\uff0c\u90fd\u662f\u91c7\u7528\u4e8c\u8fdb\u5236\u6570\u6765\u8868\u793a\u7684\u3002\u4e8c\u8fdb\u5236\uff08Binary\uff09\u6570\u75280\u548c1\u4e24\u4e2a\u6570\u5b57\u53ca\u5176\u7ec4\u5408\u6765\u8868\u793a\u4efb\u4f55\u6570\u3002\u8fdb\u4f4d\u89c4\u5219\u662f"\u90222\u8fdb1\u201d\uff0c\u6570\u5b571\u5728\u4e0d\u540c\u7684\u4f4d\u4e0a\u4ee3\u8868\u4e0d\u540c\u7684\u503c\uff0c\u6309\u4ece\u53f3\u81f3\u5de6\u7684\u6b21\u5e8f\uff0c\u8fd9\u4e2a\u503c\u4ee5\u4e8c\u500d\u9012\u589e\u3002<\/code><\/pre>\n
          \u539f\u7801 \u53cd\u7801 \u8865\u7801<\/h3>\n
          (\u80cc\u4e0b\u6765)\u5bf9\u4e8e\u6709\u7b26\u53f7\u7684\u800c\u8a00\uff1a1. \u4e8c\u8fdb\u5236\u7684\u6700\u9ad8\u4f4d\u662f\u7b26\u53f7\u4f4d: 0\u8868\u793a\u6b63\u6570,1\u8868\u793a\u8d1f\u6570(\u8001\u97e9\u53e3\u8bc0: O->0 1-> -)2. \u6b63\u6570\u7684\u539f\u7801\uff0c\u53cd\u7801\uff0c\u8865\u7801\u90fd\u4e00\u6837(\u4e09\u7801\u5408\u4e00)3\uff0e\u8d1f\u6570\u7684\u53cd\u7801=\u5b83\u7684\u539f\u7801\u7b26\u53f7\u4f4d\u4e0d\u53d8\uff0c\u5176\u5b83\u4f4d\u53d6\u53cd(0->1,1->0)4. \u8d1f\u6570\u7684\u8865\u7801=\u5b83\u7684\u53cd\u7801 + 1\uff0c \u8d1f\u6570\u7684\u53cd\u7801 = \u8d1f\u6570\u7684\u8865\u7801 - 15. 0\u7684\u53cd\u7801\uff0c\u8865\u7801\u90fd\u662fO6. java\u6ca1\u6709\u65e0\u7b26\u53f7\u6570\uff0c\u6362\u8a00\u4e4b\uff0cjava\u4e2d\u7684\u6570\u90fd\u662f\u6709\u7b26\u53f7\u76847\uff0e\u5728\u8ba1\u7b97\u673a\u8fd0\u7b97\u7684\u65f6\u5019\uff0c\u90fd\u662f\u4ee5\u8865\u7801\u7684\u65b9\u5f0f\u6765\u8fd0\u7b97\u7684.8\uff0e\u5f53\u6211\u4eec\u770b\u8fd0\u7b97\u7ed3\u679c\u7684\u65f6\u5019\uff0c\u8981\u770b\u4ed6\u7684\u539f\u7801<\/code><\/pre>\n
          \u4f4d\u8fd0\u7b97\u7b26<\/h3>\n
          \u25cfjava\u4e2d\u67097\u4e2a\u4f4d\u8fd0\u7b97 ( &\uff0c |, ^, ~, >>, << \u548c >>>)\u5206\u522b\u662f \u6309\u4f4d\u4e0e&\u3001\u6309\u4f4d\u6216|\u3001\u6309\u4f4d\u5f02\u6216^,\u6309\u4f4d\u53d6\u53cd~,\u5b83\u4eec\u7684\u8fd0\u7b97\u89c4\u5219\u662f:\u6309\u4f4d\u4e0e&    \u4e24\u4f4d\u5168\u4e3a1\uff0c\u7ed3\u679c\u4e3a1\uff0c\u5426\u5219\u4e3a0\u6309\u4f4d\u6216| \u4e24\u4f4d\u6709\u4e00\u4e2a\u4e3a1\uff0c\u7ed3\u679c\u4e3a1\uff0c\u5426\u5219\u4e3a0\u6309\u4f4d\u5f02\u6216   \u4e24\u4f4d\u4e00\u4e2a\u4e3aO,\u4e00\u4e2a\u4e3a1, \u7ed3\u679c\u4e3a1\uff0c\u5426\u5219\u4e3a0\u6309\u4f4d\u53d6\u53cd\u3002 0->1,1->0<\/code><\/pre>\n
          \/\/\u4f4d\u8fd0\u7b97public class BitOperator {     \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        \/\/\u770b\u8001\u5e08\u7684\u63a8\u5bfc\u8fc7\u7a0b      \/\/1. \u5148\u5f97\u5230 2\u7684\u8865\u7801 => 2\u7684\u539f\u7801 00000000 00000000 00000000 00000010        \/\/   2\u7684\u8865\u7801 00000000 00000000 00000000 00000010       \/\/2. 3\u7684\u8865\u7801 3\u7684\u539f\u7801 00000000 00000000 00000000 00000011      \/\/   3\u7684\u8865\u7801 00000000 00000000 00000000 00000011       \/\/3. \u6309\u4f4d&        \/\/   00000000 00000000 00000000 00000010        \/\/   00000000 00000000 00000000 00000011        \/\/   00000000 00000000 00000000 00000010 & \u8fd0\u7b97\u540e\u7684\u8865\u7801       \/\/   \u8fd0\u7b97\u540e\u7684\u539f\u7801 \u4e5f\u662f  00000000 00000000 00000000 00000010     \/\/   \u7ed3\u679c\u5c31\u662f  2        System.out.println(2&3);\/\/2     \/\/\u63a8\u5bfc        \/\/1. \u5148\u5f97\u5230 -2\u7684\u539f\u7801 10000000 00000000 00000000 00000010      \/\/2. -2\u7684 \u53cd\u7801         11111111 11111111 11111111 11111101     \/\/3. -2\u7684 \u8865\u7801       11111111 11111111 11111111 11111110       \/\/4. ~-2\u64cd\u4f5c        00000000 00000000 00000000 00000001\u8fd0\u7b97\u540e\u7684\u8865\u7801     \/\/5. \u8fd0\u7b97\u540e\u7684\u539f\u7801 \u5c31\u662f 00000000 00000000 00000000 00000001 => 1      System.out.println(~-2);\/\/1     \/\/\u63a8\u5bfc        \/\/1. \u5f97\u52302\u7684\u8865\u7801 00000000 00000000 00000000 00000010     \/\/2. ~2\u64cd\u4f5c     11111111 11111111 11111111 11111101  \u8fd0\u7b97\u540e\u7684\u8865\u7801       \/\/3. \u8fd0\u7b97\u540e\u7684\u53cd\u7801  11111111 11111111 11111111 11111100        \/\/4. \u8fd0\u7b97\u540e\u7684\u539f\u7801  10000000 00000000 00000000 00000011=>-3     System.out.println(~2); \/\/-3    }}<\/code><\/pre>\n
          \u8fd8\u67093\u4e2a\u4f4d\u8fd0\u7b97\u7b26>>\u3001<< \u548c >>>\uff0c\u8fd0\u7b97\u89c4\u5219:1\uff0e\u7b97\u672f\u53f3\u79fb >>\uff1a\u4f4e\u4f4d\u6ea2\u51fa,\u7b26\u53f7\u4f4d\u4e0d\u53d8,\u5e76\u7528\u7b26\u53f7\u4f4d\u8865\u6ea2\u51fa\u7684\u9ad8\u4f4d2. \u7b97\u672f\u5de6\u79fb <<: \u7b26\u53f7\u4f4d\u4e0d\u53d8,\u4f4e\u4f4d\u8865O3. >>> \u903b\u8f91\u53f3\u79fb\u4e5f\u53eb\u65e0\u7b26\u53f7\u53f3\u79fb,\u8fd0\u7b97\u89c4\u5219\u662f: \u4f4e\u4f4d\u6ea2\u51fa\uff0c\u9ad8\u4f4d\u8865 04\uff0e\u7279\u522b\u8bf4\u660e\uff1a\u6ca1\u6709<<< \u7b26\u53f7<\/code><\/pre>\n
          \"image-20220109230232246\"<\/div><\/p>\n
          public class BitOperator02 {    \/\/\u7f16\u5199\u4e00\u4e2amain\u65b9\u6cd5    public static void main(String[] args) {        System.out.println(1 >> 2); \/\/0       System.out.println(1 << 2); \/\/4       System.out.println(4 << 3); \/\/ 4 * 2 * 2 * 2 = 32     System.out.println(15 >> 2); \/\/ 15 \/ 2 \/ 2 = 3        System.out.println(-10.4%3); \/\/ -1.4\u8fd1\u4f3c\u503c     int i=66;       System.out.println(++i+i); \/\/134    }}<\/code><\/pre>\n
          \u672c\u7ae0\u4f5c\u4e1a<\/h3>\n
          \"image-20220109230317190\"<\/div>
          \n
          \"image-20220109230502575\"<\/div>
          \n
          \"image-20220109230538258\"<\/div><\/p>\n
          \u63a7\u5236\u7ed3\u6784<\/h2>\n
          \u987a\u5e8f<\/h3>\n
          \u5206\u652f<\/h4>\n
          \u5faa\u73af<\/h4>\n
          break<\/h4>\n
          continue<\/h4>\n
          return<\/h4>\n","protected":false},"excerpt":{"rendered":"
          \u6848\u4f8b\u90fd\u6765\u6e90\u4e8e\u97e9\u987a\u5e73\u8001\u5e08\u7684\u6574\u7406 \u8f6c\u4e49\u5b57\u7b26 Java\u5e38\u89c1\u7684\u8f6c\u4e49\u5b57\u7b26 \u5bf9\u5e94\u5173\u7cfb \\t \u5236\u8868\u4f4d \\n \u6362\u884c \\\\ \\  […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[125],"tags":[42,93],"class_list":["post-13","post","type-post","status-publish","format-standard","hentry","category-java-backend","tag-java","tag-93"],"_links":{"self":[{"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/posts\/13","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=13"}],"version-history":[{"count":1,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/posts\/13\/revisions"}],"predecessor-version":[{"id":2195,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/posts\/13\/revisions\/2195"}],"wp:attachment":[{"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=13"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=13"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=13"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}