{"id":31023,"date":"2022-12-31T01:42:44","date_gmt":"2023-05-11T19:25:42","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava%e7%9a%84%e6%96%b9%e6%b3%95%e3%80%82\/"},"modified":"2025-08-12T21:55:00","modified_gmt":"2025-08-12T13:55:00","slug":"%e5%85%b3%e4%ba%8ejava%e7%9a%84%e6%96%b9%e6%b3%95%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava%e7%9a%84%e6%96%b9%e6%b3%95%e3%80%82\/","title":{"rendered":"\u5173\u4e8eJava\u7684\u65b9\u6cd5"},"content":{"rendered":"<h2>&#8220;\u65b9\u6cd5&#8221;\u7684\u610f\u601d\u662f<\/h2>\n<p>\u5728\u4e2d\u6587\u4e2d\uff0c\u8fd9\u4e2a\u53e5\u5b50\u7684\u7ffb\u8bd1\u5982\u4e0b\uff1a<\/p>\n<p>\u7c7b\u662f\u4e00\u7ec4\u64cd\u4f5c\uff08\u529f\u80fd\u3001\u53ef\u4ee5\u6267\u884c\u7684\u64cd\u4f5c\u3001\u547d\u4ee4\u7b49\uff09\u7684\u96c6\u5408\u3002\u5177\u4f53\u63cf\u8ff0\u6765\u8bf4\uff0c\u5b83\u662f\u5c5e\u4e8e\u7279\u5b9a\u7c7b\u6216\u5bf9\u8c61\u7684\u4e00\u7ec4\u5904\u7406\u4efb\u52a1\u548c\u91cd\u590d\u4efb\u52a1\u7684\u96c6\u5408\uff0c\u5c06\u591a\u4e2a\u64cd\u4f5c\u7ec4\u5408\u6210\u4e00\u4e2a\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code>\u623b\u308a\u5024\u306e\u578b \u30e1\u30bd\u30c3\u30c9\u540d\u3000\uff08\u5f15\u6570\uff09{\r\n     \u51e6\u7406(\u547d\u4ee4\u6587)\r\n     return;(\u623b\u308a\u5024)\r\n  }\r\n<\/code><\/pre>\n<p>\u30fb\u53c2\u6570\uff1a\u4ece\u8c03\u7528\u8005\u90a3\u91cc\u63a5\u6536\u7684\u503c\u3002\u5f53\u60f3\u8981\u7528\u8fd9\u4e2a\u503c\u6765\u5904\u7406\u6570\u636e\u65f6\uff0c\u6307\u7684\u662f\u4f20\u9012\u7684\u503c\u3002\u5373\u4f7f\u6ca1\u6709\u53c2\u6570\uff0c\u4e5f\u8981\u5199\u4e0a\uff08\uff09\u3002<br \/>\n\u30fb\u8fd4\u56de\u503c\uff1a\u5728\u65b9\u6cd5\u5904\u7406\u540e\u8fd4\u56de\u7ed9\u8c03\u7528\u8005\u7684\u503c\u3002\u7b80\u5355\u8bf4\u5c31\u662f\u5904\u7406\u7ed3\u679c\u7684\u6570\u636e\u3002\u4f7f\u7528\u201creturn\u201d\u6307\u5b9a\u3002\u5982\u679c\u6ca1\u6709\u8fd4\u56de\u503c\uff08\u4e0d\u8fd4\u56de\u4efb\u4f55\u4e1c\u897f\uff09\uff0c\u8981\u5728\u8fd4\u56de\u503c\u7684\u7c7b\u578b\u4e0a\u5199\u4e0a\u201cvoid\u201d\u3002<br \/>\n\u30fb\u65b9\u6cd5\u540d\uff1a\u53ef\u4ee5\u968f\u610f\u53d6\u540d\uff0c\u9075\u5faa\u53d8\u91cf\u7684\u547d\u540d\u89c4\u5219\u3002<\/p>\n<pre class=\"post-pre\"><code>void \u30e1\u30bd\u30c3\u30c9\u540d(\u5f15\u6570){\r\n    \u51e6\u7406(\u547d\u4ee4\u6587)\r\n}\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0a5d37434c4406be3ec4\/5-0.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2022-11-02 13.32.32.png\" \/><\/div>\n<pre class=\"post-pre\"><code>class Student{\r\n  \/\/\u30e1\u30f3\u30d0\u5909\u6570\uff08\u5c5e\u6027\uff09\r\n  String name;\r\n  int engScore;\r\n  int mathScore;\r\n\r\n  \/\/\u30e1\u30bd\u30c3\u30c9\uff08\u64cd\u4f5c\uff09\r\n  void display(){\r\n    System.out.println(name + \"\u3055\u3093\");\r\n    System.out.println(\"\u82f1\u8a9e\" + engScore + \"\u70b9\u30fb\u6570\u5b66\" + mathScore + \"\u70b9\");\r\n  }\r\n  void setScore(int eng, int math){\r\n    engScore = eng;\r\n    mathScore = math;\r\n  }  \r\n  double getAvg(){\r\n    double avg = (engScore + mathScore) \/ 2.0;\r\n    return avg;\r\n  }\r\n}\r\n<\/code><\/pre>\n<p>\u5728\u65b9\u6cd5\u4e2d\u5b9a\u4e49\u7684\u53d8\u91cf\u88ab\u79f0\u4e3a\u5c40\u90e8\u53d8\u91cf\u3002\u5c40\u90e8\u53d8\u91cf\u7684\u4f5c\u7528\u57df\u4ec5\u9650\u4e8e\u65b9\u6cd5\u5185\u90e8\uff0c\u6240\u4ee5\u65e0\u6cd5\u4ece\u5176\u4ed6\u65b9\u6cd5\u8bbf\u95ee\u53e6\u4e00\u4e2a\u65b9\u6cd5\u7684\u5c40\u90e8\u53d8\u91cf\uff0c\u5e76\u4e14\u5f53\u65b9\u6cd5\u7ed3\u675f\u65f6\uff0c\u5c40\u90e8\u53d8\u91cf\u4e5f\u4f1a\u88ab\u9500\u6bc1\u3002<\/p>\n<p>\u4e0a\u9762\u7684\u56fe\u7247\u5c55\u793a\u4e86\u65b9\u6cd5\u7684\u4e09\u79cd\u60c5\u51b5\uff1a<br \/>\n1. \u6ca1\u6709\u8fd4\u56de\u503c\u548c\u53c2\u6570\u7684\u60c5\u51b5\uff1b<br \/>\n2. \u6709\u53c2\u6570\u4f46\u6ca1\u6709\u8fd4\u56de\u503c\u7684\u60c5\u51b5\uff1b<br \/>\n3. \u6709\u8fd4\u56de\u503c\u4f46\u6ca1\u6709\u53c2\u6570\u7684\u60c5\u51b5\u3002<\/p>\n<h2>\u6ca1\u6709\u53c2\u6570\u548c\u8fd4\u56de\u503c\u7684\u65b9\u6cd5<\/h2>\n<pre class=\"post-pre\"><code> class Point {\r\n\tint x;\r\n\tint y;\r\n\t\r\n      \/\/\u547c\u3073\u51fa\u3055\u308c\u308b\u5074\r\n\t void printPonition() {\r\n\t\t  System.out.println(\"\u5ea7\u6a19\u5024\u306f(\" + this.x +\",\"+ this.y +\")\u3067\u3059\"); \r\n\t  }\r\n     void printPonition2() {\r\n\t\t  System.out.println(\"\u5ea7\u6a19\u5024\u306f(\" + this.x +\",\"+ this.y +\")\u3067\u3059\"); \r\n\t  }\r\n\t}\r\n\r\n class Main {\r\n\tpublic static void main(String[] args) {\r\n\t\tPoint p1 = new Point();\r\n\t\tp1.x = 10;\r\n\t\tp1.y = 5;\r\n\t\r\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000Point p2 = new Point();\r\n\t\tp2.x = 5;\r\n\t\tp2.y = 2;\r\n\t\tSystem.out.println(\"p1.printPonition\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\"); \r\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\/\/p1\u306eprintPonition\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\r\n\t    p1.printPonition();\r\n\r\n        System.out.println(\"--------\"); \r\n\r\n\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000System.out.println(\"p2.printPonition\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\"); \r\n\t    p2.printPonition();\r\n\t}\r\n}\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>p1.printPonition1\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\r\n\u5ea7\u6a19\u5024\u306f(10,5)\u3067\u3059\r\n--------\r\np2.printPonition2\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\r\n\u5ea7\u6a19\u5024\u306f(5,2)\u3067\u3059\r\n<\/code><\/pre>\n<p>\u5728\u5b9e\u4f8b\u4e0a\u9762\uff0c\u53ef\u4ee5\u901a\u8fc7\u5728\u53d8\u91cf\u540d\u540e\u52a0\u4e0a\u70b9(.)\u5e76\u5199\u5165\u65b9\u6cd5\u540d\u7684\u65b9\u5f0f\u6765\u6267\u884c\u65b9\u6cd5\u3002<\/p>\n<p>&#8220;this&#8221; \u662f\u4e00\u4e2a\u8868\u793a\u81ea\u8eab\u7684\u5173\u952e\u8bcd\u3002\u5b83\u7528\u4e8e\u5728\u65b9\u6cd5\u4e2d\u5f15\u7528\u5b9e\u4f8b\u53d8\u91cf\u3002<\/p>\n<p>\u6267\u884c\u5f00\u59cb\u4e8emain\u65b9\u6cd5\u4e2d\u7684\u4ee3\u7801\uff0c\u4eceMain\u7c7b\u5f00\u59cb\u800c\u4e0d\u662fJava\u7684\u6267\u884c\u3002\u6309\u987a\u5e8f\u4ece\u4e0a\u81f3\u4e0b\u6267\u884c\uff0c\u5e76\u5728\u8c03\u7528printPosition1\u65b9\u6cd5\u65f6\uff0c\u5904\u7406\u6d41\u7a0b\u5c06\u8f6c\u79fb\u5230printPosition1\u65b9\u6cd5\u4e2d\u6240\u5199\u7684\u6307\u4ee4\u3002\u5f53\u6267\u884c\u5b8cprintPosition1\u65b9\u6cd5\u4e2d\u7684\u6307\u4ee4\u65f6\uff0c\u6d41\u7a0b\u5c06\u8fd4\u56de\u5230\u8c03\u7528\u65b9\u5e76\u8f93\u51fa&#8221;&#8212;&#8212;&#8220;\uff0c\u7136\u540e\u8c03\u7528printPosition2\u65b9\u6cd5\u3002\u8fd9\u6837\uff0c\u5904\u7406\u6d41\u7a0b\u4e00\u76f4\u8fde\u7eed\u4e0d\u65ad\u5730\u6267\u884c\u6bcf\u4e2a\u6307\u4ee4\u3002<\/p>\n<h2>\u6709\u53c2\u6570\u7684\u65b9\u6cd5\uff08\u65e0\u8fd4\u56de\u503c\uff09<\/h2>\n<p>\u4f20\u9012\u53c2\u6570\u53ef\u4ee5\u4f7f\u7528\u65b9\u6cd5\u540d\u540e\u9762\u7684\u62ec\u53f7()\u8fdb\u884c\u3002\u63a5\u6536\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u65b9\u6cd5\u7684\u503c\uff08\u5b9e\u9645\u53c2\u6570\uff09\u7684\u53d8\u91cf\uff08\u5f62\u5f0f\u53c2\u6570\uff09\u53ea\u80fd\u5728\u8be5\u65b9\u6cd5\u4e2d\u4f7f\u7528\uff0c\u5b83\u6210\u4e3a\u5c40\u90e8\u53d8\u91cf\u3002\u5982\u679c\u8981\u6307\u5b9a\u591a\u4e2a\u53c2\u6570\uff0c\u53ef\u4ee5\u5728\u62ec\u53f7\u4e2d\u7528\u9017\u53f7\uff08,\uff09\u5206\u9694\u7c7b\u578b\u548c\u53d8\u91cf\u540d\u7684\u7ec4\u5408\u6765\u63cf\u8ff0\u3002\u8c03\u7528\u65b9\u6cd5\u7684\u4e00\u65b9\u540c\u6837\u5730\uff0c\u5728\u62ec\u53f7\u4e2d\u7528\u9017\u53f7\uff08,\uff09\u5206\u9694\u503c\u6765\u63cf\u8ff0\u3002<\/p>\n<pre class=\"post-pre\"><code>void \u30e1\u30bd\u30c3\u30c9\u540d(\u578b\u3000\u3000\u5909\u6570\uff08\u4eee\u5f15\u6570\uff09);\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>class Pont {\r\n\tint x;\r\n\tint y;\r\n\t\r\n\t void printPonition() {\r\n\t\t  System.out.println(\"\u5ea7\u6a19\u5024\u306f(\" + this.x +\",\"+ this.y +\")\u3067\u3059\"); \r\n\t } \r\n\t void add(int n, int m ) {   \/\/\u4eee\u5f15\u6570\u3068\u3057\u3066int n\u3068 int m\u3092\u53d7\u3051\u3068\u3063\u3066\u3044\u308b\r\n\t\t this.x += n;\r\n\t\t this.y += m;\r\n\t } \r\n}\r\n\r\nclass ArgumentsExample {\r\n\tpublic static void main(String[] args) {\r\n\t\tPont p = new Pont();\r\n\t\tp.x = 10;\r\n\t\tp.y = 5;\r\n\t\tp.printPonition();\r\n\t\t\r\n\t\tp.add(3,4);      \/\/add\u30e1\u30bd\u30c3\u30c9\u306b\u5b9f\u6570\u3068\u3057\u3066\u6574\u6570\u306e\uff13\u3068\uff14\u3092\u6e21\u3057\u3066\u3044\u308b\u3002\r\n\t\tp.printPonition();\r\n\t}\r\n}\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>\u5ea7\u6a19\u5024\u306f(10,5)\u3067\u3059  \u2190\u6700\u521d\u306bx\u3068y\u306e\u5024\u3092\uff11\uff10\u3068\uff15\u306b\u8a2d\u5b9a\r\n\u5ea7\u6a19\u5024\u306f(13,9)\u3067\u3059\u3000\u3000\u3000\u3000\u2190add\u30e1\u30bd\u30c3\u30c9\u306b\u6574\u6570\uff13\u3068\uff14\u3092\u6e21\u3057\u3066\u3044\u308b\u306e\u3067x\u3068y\u306b\u305d\u308c\u305e\u308c\u304c\u8db3\u3055\u308c\u305f\u7d50\u679c\u306b\u306a\u308b\r\n<\/code><\/pre>\n<p>\u4f7f\u7528 add \u65b9\u6cd5\u65f6\u4f20\u5165\u6574\u6570 3 \u548c 4 \u4f5c\u4e3a\u5b9e\u6570\uff0c\u5e76\u63a5\u53d7 int n \u548c int m \u4f5c\u4e3a\u5f62\u5f0f\u53c2\u6570\u3002\u5c06 3 \u8d4b\u503c\u7ed9 int n\uff0c\u5c06 4 \u8d4b\u503c\u7ed9 int m\uff0c\u7136\u540e\u7f16\u5199 this.x += n; this.y += m;\uff0c\u4ee5\u4fbf\u8f93\u51fa\u4e24\u8005\u76f8\u52a0\u7684\u7ed3\u679c\u3002<\/p>\n<p>\u53ea\u9700\u8981\u4e00\u79cd\u9009\u9879\uff1a<br \/>\n\uff0a \u53c2\u6570\u9700\u6839\u636e\u4f20\u9012\u7684\u503c\u7684\u6570\u91cf\u8fdb\u884c\u7f16\u5199\uff0c\u5e76\u4e14\u5fc5\u987b\u4f7f\u7528\u4e0e\u4f20\u9012\u7684\u503c\u76f8\u540c\u7684\u6570\u636e\u7c7b\u578b\u8fdb\u884c\u58f0\u660e\u3002<\/p>\n<h2>\u6709\u8fd4\u56de\u503c\u7684\u65b9\u6cd5\uff08\u65e0\u53c2\u6570\uff09<\/h2>\n<p>\u5728\u8c03\u7528\u65b9\u4e0d\u4ec5\u53ef\u4ee5\u5c06\u503c\u4f20\u9012\u7ed9\u65b9\u6cd5\uff0c\u8fd8\u53ef\u4ee5\u5728\u8c03\u7528\u65b9\u63a5\u6536\u65b9\u6cd5\u5904\u7406\u540e\u7684\u7ed3\u679c\u503c\u3002<br \/>\n\u901a\u8fc7\u63a5\u6536\u8fd4\u56de\u503c\uff0c\u8c03\u7528\u65b9\u53ef\u4ee5\u4e86\u89e3\u67d0\u4e2a\u8ba1\u7b97\u7684\u7ed3\u679c\u6216\u8005\u5904\u7406\u662f\u5426\u6210\u529f\u3002<\/p>\n<p>\u4e00\u4e2a\u65b9\u6cd5\u53ea\u80fd\u6307\u5b9a\u4e00\u4e2a\u8fd4\u56de\u503c\uff0c\u5e76\u4e14\u9700\u8981\u5728\u65b9\u6cd5\u540d\u4e4b\u524d\u6ce8\u660e\u8fd4\u56de\u503c\u7684\u7c7b\u578b\u3002<br \/>\n\u5982\u679c\u8fd4\u56de\u503c\u662f\u57fa\u672c\u7c7b\u578b\uff0c\u9700\u8981\u6ce8\u660eint\u3001double\u3001boolean\u7b49\u7c7b\u578b\u7684\u540d\u79f0\uff1b\u5982\u679c\u8fd4\u56de\u503c\u662f\u5f15\u7528\u7c7b\u578b\uff0c\u5219\u9700\u8981\u6ce8\u660e\u7c7b\u540d\uff0c\u5982Point\u3002<\/p>\n<p>\u5728\u65b9\u6cd5\u5904\u7406\u7684\u6700\u540e\uff0c\u7d27\u8ddf\u7740\u5173\u952e\u5b57return\uff0c\u5e76\u4e14\u5199\u4e0b\u8981\u8fd4\u56de\u7684\u503c\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u8fd4\u56de\u7684\u6570\u636e\u7c7b\u578b\u5fc5\u987b\u4e0e\u8fd4\u56de\u503c\u7684\u6570\u636e\u7c7b\u578b\u5b8c\u5168\u4e00\u81f4\uff0c\u5426\u5219\u5728\u7f16\u8bd1\u65f6\u4f1a\u51fa\u73b0\u9519\u8bef\u3002<\/p>\n<pre class=\"post-pre\"><code>\u623b\u308a\u5024\u306e\u578b \u30e1\u30bd\u30c3\u30c9\u540d\u3000\uff08\u5f15\u6570\uff09{\r\n     \u51e6\u7406(\u547d\u4ee4\u6587)\r\n     return  \u623b\u308a\u5024;\r\n}\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>class Point {\r\n\tint x;\r\n\tint y;\r\n\t\r\n\t\/\/x\u3068y\u3092\u639b\u3051\u305f\u7d50\u679c\u3092\u8fd4\u3059\r\n\tint getXY() {\r\n\t\treturn this.x * this.y;\r\n\t  }\r\n\t}\r\n\r\n class Main {\r\n\tpublic static void main(String[] args) {\r\n\t\tPoint p = new Point();\r\n\t\tp.x = 10;\r\n\t\tp.y = 5;\r\n\t\t\r\n\t\t\/\/p\u306egetXY\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u3092int\u578b\u306e\u5909\u6570xy\u306b\u4ee3\u5165\r\n\t\tint xy = p.getXY();    \r\n\t    System.out.println(\"p\u306ex\u3068y\u3092\u639b\u3051\u305f\u7d50\u679c\u306f\" + xy); \r\n\r\n\t}\r\n}\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>p\u306ex\u3068y\u3092\u639b\u3051\u305f\u7d50\u679c\u306f50\r\n<\/code><\/pre>\n<h2>\u6709\u53c2\u6570\u548c\u8fd4\u56de\u503c\u7684\u65b9\u6cd5<\/h2>\n<p>\u5728\u4e4b\u524d\u6211\u4eec\u5206\u522b\u770b\u8fc7\u6709\u53c2\u6570\u7684\u65b9\u6cd5\u548c\u6709\u8fd4\u56de\u503c\u7684\u65b9\u6cd5\uff0c\u4f46\u4e5f\u53ef\u4ee5\u5b58\u5728\u65e2\u6709\u53c2\u6570\u53c8\u6709\u8fd4\u56de\u503c\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u4e0b\u5217\u7684isSamePosition\u65b9\u6cd5\u63a5\u6536Point\u7c7b\u5b9e\u4f8b\u7684\u5f15\u7528\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u6bd4\u8f83\u8be5\u5b9e\u4f8b\u4e0e\u81ea\u5df1\u7684\u5750\u6807\u503c\uff0c\u8fd4\u56de\u6bd4\u8f83\u7ed3\u679c\u3002\u8fd4\u56de\u503c\u4e3a\u5e03\u5c14\u7c7b\u578b\uff0c\u5982\u679c\u5750\u6807\u503c\u76f8\u540c\uff0c\u5219\u8fd4\u56detrue\uff0c\u5426\u5219\u8fd4\u56defalse\u3002<br \/>\n\u50cf\u8fd9\u6837\u7684\u65b9\u6cd5\u4e0d\u4ec5\u53ef\u4ee5\u63a5\u6536\u57fa\u672c\u7c7b\u578b\uff08\u5982int\u6216double\uff09\u7684\u503c\uff0c\u8fd8\u53ef\u4ee5\u63a5\u6536\u5b9e\u4f8b\u7684\u5f15\u7528\u4f5c\u4e3a\u53c2\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code>class Point {\r\n\tint x;\r\n\tint y;\r\n\t\r\n\tvoid muitiply(int n) {\r\n\t\tthis.x *= n;\r\n\t\tthis.y *= n;\r\n\t  }\r\n\t\r\n\t\r\n\tboolean isSamePosition(Point p) {\r\n\t\tif(this.x == p.x &amp;&amp; this.y == p.y) {\r\n\t\t\treturn true;\r\n\t\t} else {\r\n\t\t\treturn false;\r\n\t\t}\r\n\t}\r\n} \r\n\r\n class Main {\r\n\tpublic static void main(String[] args) {\r\n\t\tPoint p1 = new Point();\r\n\t\tp1.x = 4;\r\n\t\tp1.y = 2;\r\n\t\t\r\n\t\tPoint p2 = new Point();\r\n\t\tp2.x = 8;\r\n\t\tp2.y = 4;\r\n\t\t\r\n\t\tif(p1.isSamePosition(p2) == true) {\r\n\t\t\tSystem.out.println(\"p\uff11\u3068p\uff12\u306f\u540c\u3058\u5ea7\u6a19\u3067\u3059\" ); \r\n\t\t} else {\r\n\t\t\tSystem.out.println(\"p\uff11\u3068p\uff12\u306f\u7570\u306a\u308b\u5ea7\u6a19\u3067\u3059\"); \r\n\t\t}\r\n\t\t\r\n\t   p1.muitiply(2);\r\n\t   if(p1.isSamePosition(p2) == true) {\r\n\t\t\tSystem.out.println(\"p\uff11\u3068p\uff12\u306f\u540c\u3058\u5ea7\u6a19\u3067\u3059\"); \r\n\t\t} else {\r\n\t\t\tSystem.out.println(\"p\uff11\u3068p\uff12\u306f\u7570\u306a\u308b\u5ea7\u6a19\u3067\u3059\"); \r\n\t\t}\r\n\t}\r\n}\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>p\uff11\u3068p\uff12\u306f\u7570\u306a\u308b\u5ea7\u6a19\u3067\u3059\r\np\uff11\u3068p\uff12\u306f\u540c\u3058\u5ea7\u6a19\u3067\u3059\r\n<\/code><\/pre>\n<p>isSamePosition\u65b9\u6cd5\u63a5\u6536\u7684\u53c2\u6570\u662fPoint\u7c7b\u7684\u5b9e\u4f8b\uff0c\u6240\u4ee5\u53ef\u4ee5\u5c06\u53d8\u91cf p2 \u4f5c\u4e3a\u53c2\u6570\u4f20\u5165\u3002\uff08\u867d\u7136\u8868\u8fbe\u4e3a\u201cPoint\u7c7b\u7684\u5b9e\u4f8b\u201d\uff0c\u4f46\u5b9e\u9645\u4e0aisSamePosition\u65b9\u6cd5\u63a5\u6536\u7684\u662f\u201cPoint\u7c7b\u5b9e\u4f8b\u7684\u5f15\u7528\u201d\uff09\u3002\u901a\u8fc7\u6bd4\u8f83\u7a0b\u5e8f\u4ee3\u7801\u548c\u7ed3\u679c\uff0c\u6700\u5f00\u59cb\u65f6\uff0cp1\u7684\u5750\u6807\u662f\uff082\uff0c4\uff09\uff0cp2\u7684\u5750\u6807\u662f\uff084\uff0c8\uff09\uff0c\u7ed3\u679c\u4e0d\u540c\u3002\u4f46\u662f\u5728\u4e2d\u95f4\uff0cp1\u7684\u5750\u6807\u53d8\u6210\u4e86\uff084\uff0c8\uff09\uff0c\u53ef\u4ee5\u786e\u8ba4p1\u548cp2\u73b0\u5728\u5177\u6709\u76f8\u540c\u7684\u5750\u6807\u3002<\/p>\n<h2>\u7c7b\u65b9\u6cd5\uff08\u9759\u6001\u65b9\u6cd5\uff09\u548c\u5b9e\u4f8b\u65b9\u6cd5<\/h2>\n<p>\u9759\u6001\u65b9\u6cd5\u662f\u5e26\u6709\u9759\u6001\u4fee\u9970\u7b26\u7684\u65b9\u6cd5\u3002<br \/>\n\u5b9e\u4f8b\u65b9\u6cd5\u662f\u4e0d\u5e26\u6709\u9759\u6001\u4fee\u9970\u7b26\u7684\u65b9\u6cd5\uff0c\u6b63\u5982\u5176\u540d\u79f0\u6240\u793a\uff0c\u5b83\u662f\u4e0e\u5b9e\u4f8b\u76f8\u5173\u8054\u7684\u65b9\u6cd5\uff0c\u56e0\u6b64\u5fc5\u987b\u901a\u8fc7\u5b9e\u4f8b\u5316\u7c7b\u6765\u4f7f\u7528\u3002<br \/>\n\u5728Java\u4e2d\uff0c\u901a\u5e38\u7684\u65b9\u6cd5\u9700\u8981\u5b9e\u4f8b\u5316\u7c7b\u540e\u624d\u80fd\u4f7f\u7528\uff0c\u4f46\u52a0\u4e0astatic\u4fee\u9970\u7b26\u7684\u7c7b\u65b9\u6cd5\u53ef\u4ee5\u76f4\u63a5\u8c03\u7528\u548c\u4f7f\u7528\uff0c\u5b83\u662f\u4e0e\u7c7b\u76f8\u5173\u8054\u7684\u65b9\u6cd5\uff0c\u5e76\u5b9a\u4e49\u4e86\u4e0e\u6574\u4e2a\u7c7b\u76f8\u5173\u7684\u5904\u7406\u3002<\/p>\n<pre class=\"post-pre\"><code>\u30af\u30e9\u30b9\u540d.\u30e1\u30bd\u30c3\u30c9\u540d();\r\n\/\/\u4f8b\u6587\r\n Student4 stu1 = new Student4(\"\u83c5\u539f\");\r\n    Student4.display();\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u540d.\u30e1\u30bd\u30c3\u30c9\u540d();\r\n\/\/\u4f8b\u6587\r\n Student4 stu1 = new Student4(\"\u83c5\u539f\");\r\n    stu1.display();\r\n<\/code><\/pre>\n<h3>\u9759\u6001\u65b9\u6cd5\uff08\u7c7b\u65b9\u6cd5\uff09\u548c\u5b9e\u4f8b\u65b9\u6cd5\u7684\u4f7f\u7528\u65b9\u5f0f<\/h3>\n<p>\u9759\u6001\u65b9\u6cd5\uff08\u7c7b\u65b9\u6cd5\uff09\u7684\u4e3b\u8981\u7528\u9014\u662f\u6267\u884c\u4e0d\u4f9d\u8d56\u4e8e\u5b9e\u4f8b\u72b6\u6001\u7684\u64cd\u4f5c\u3002\u8fd9\u4e5f\u88ab\u79f0\u4e3a\u5b9e\u7528\u65b9\u6cd5\uff0c\u5e76\u7528\u4e8e\u89c4\u5b9a\u597d\u7684\u5904\u7406\u64cd\u4f5c\u3002<\/p>\n<p>\u5f53\u9700\u8981\u5728\u6bcf\u4e2a\u5b9e\u4f8b\uff08\u5bf9\u8c61\uff09\u4e0a\u6267\u884c\u4e0d\u540c\u64cd\u4f5c\u65f6\uff0c\u6211\u4eec\u4f7f\u7528\u5b9e\u4f8b\u65b9\u6cd5\uff0c\u56e0\u4e3a\u5b9e\u4f8b\u65b9\u6cd5\u662f\u7ed1\u5b9a\u5728\u5b9e\u4f8b\uff08\u5bf9\u8c61\uff09\u4e0a\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u4ee5\u6807\u51c6API\u4e2d\u7684String\u7c7b\u4e3a\u4f8b\uff08\u7c7b\u5e93\u662f\u6307\u5c06\u7c7b\u8fdb\u884c\u7ec4\u7ec7\u7684\u7c7b\u5e93\uff0c\u5176\u4e2d\u5305\u542b\u7684\u7c7b\u6839\u636e\u529f\u80fd\u548c\u76ee\u7684\u88ab\u5b58\u50a8\u4e3a\u5305\uff09\uff0c\u7528\u4e8e\u6bd4\u8f83\u503c\u7684\u201cequals\u201d\u65b9\u6cd5\u662f\u5b9e\u4f8b\u65b9\u6cd5\uff0c\u5c06int\u7c7b\u578b\u7684\u53d8\u91cf\u8f6c\u6362\u4e3aString\u7c7b\u578b\u7684\u201cvalueOf\u201d\u662f\u9759\u6001\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code>public boolean equals(Object anObject) \u2190 \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\r\n\r\npublic static String valueOf(int i) \u2190 static\u30e1\u30bd\u30c3\u30c9\r\n<\/code><\/pre>\n<p>&#8220;equals&#8221;\u65b9\u6cd5\u662f\u4e00\u4e2a\u5b9e\u4f8b\u65b9\u6cd5\uff0c\u7528\u4e8e\u6bd4\u8f83\u5b57\u7b26\u4e32\u5bf9\u8c61\uff08\u5b9e\u4f8b\uff09\u662f\u5426\u76f8\u7b49\uff0c\u5e76\u4e14\u4f9d\u8d56\u4e8e\u5b57\u7b26\u4e32\u5bf9\u8c61\uff08\u5b9e\u4f8b\uff09\u7684\u72b6\u6001\u3002<\/p>\n<pre class=\"post-pre\"><code>\/\/equals\u30e1\u30bd\u30c3\u30c9\u306f2\u3064\u306e\u6587\u5b57\u5217\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u306e\u6bd4\u8f03\u3092\u3059\u308b\r\nString value = \"\u3042\u3042\u3042\";\r\nvalue.equals(\"\u3044\u3044\u3044\"); \u2190 String\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u300cvalue\u300d\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\r\n<\/code><\/pre>\n<p>\u4e0e\u6b64\u76f8\u5bf9\u5e94\u7684\u662f\uff0c\u4f5c\u4e3a\u9759\u6001\u65b9\u6cd5\u7684&#8221;valueOf&#8221;\u65b9\u6cd5\u662f\u4e00\u79cd\u5c06int\u7c7b\u578b\u53d8\u91cf\u8f6c\u6362\u4e3aString\u7c7b\u578b\u53d8\u91cf\u7684\u65b9\u6cd5\uff0c\u5e76\u4e14\u4e0d\u4f9d\u8d56\u4e8eString\u5bf9\u8c61\uff08\u5b9e\u4f8b\uff09\u7684\u72b6\u6001\u3002<\/p>\n<pre class=\"post-pre\"><code>\/\/ valueOf\u30e1\u30bd\u30c3\u30c9\u306f\u5f15\u6570\u306b\u6307\u5b9a\u3057\u305f\u69d8\u3005\u306a\u578b\u306e\u5f62\u3092String\u578b\u306e\u6587\u5b57\u5217\u3068\u3057\u3066\u8fd4\u3059\u3053\u3068\u304c\u3067\u304d\u308b\r\nString newValue = String.valueOf(123); \u2190 String\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u95a2\u4fc2\u306a\u3044\u51e6\u7406\r\n\/\/ String.valueOf\u3067int\u578b\u306e\u5909\u6570(123)\u3092Stringm\u578b\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8newValue\u306b\u5909\u63db\u3057\u3066\u3044\u308b\r\n<\/code><\/pre>\n<p>\u5982\u6b64\u8bf4\u6765\uff0c\u9759\u6001\u65b9\u6cd5\u53ef\u4ee5\u6267\u884c\u4e0e\u5b9e\u4f8b\u72b6\u6001\u65e0\u5173\u7684\u64cd\u4f5c\u3002<\/p>\n<h3>\u4e0b\u9762\u662f\u4e00\u4e2a\u4f8b\u53e5\u7684\u4e2d\u6587\u672c\u5730\u8bed\u8a00\u91ca\u4e49\uff1a<\/h3>\n<p>&#8220;The weather is very hot today, so I&#8217;m going to the beach to swim and cool off.&#8221;<\/p>\n<pre class=\"post-pre\"><code>public class UtilitySampleMain {\r\n\r\n    public static void main(String[] args) {\r\n        System.out.println(\"\u6570\u5024\u30c1\u30a7\u30c3\u30af\u306e\u7d50\u679c\uff1a\" + UtilitySample.isNumber(\"\u3042\u3044\u3046\u3048\u304a\"));\r\n    }\r\n}\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>import java.util.regex.Pattern;\r\n\r\npublic class UtilitySample {\r\n\r\n    private UtilitySample() {}\r\n    \r\n    \/**\r\n     * @param value \u691c\u8a3c\u5bfe\u8c61\u306e\u5024\r\n     * @return \u7d50\u679c\uff08true\uff1a\u6570\u5024\u3001false\uff1a\u6570\u5024\u3067\u306f\u306a\u3044\uff09\r\n     *\/\r\n        \r\n     \/\/ \u6570\u5024\u30c1\u30a7\u30c3\u30af\u3092\u3059\u308b\u70ba\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u72b6\u614b\u306b\u4f9d\u5b58\u3057\u306a\u3044isNumber\u30e1\u30bd\u30c3\u30c9\r\n    public static boolean isNumber(String value) {\r\n        boolean result = false;\r\n        if (value != null) {\r\n            Pattern pattern = Pattern.compile(\"^[0-9]+$|-[0-9]+$\");\r\n            result = pattern.matcher(value).matches();\r\n        }\r\n        return result;\r\n    }\r\n}\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>\u6570\u5024\u30c1\u30a7\u30c3\u30af\u306e\u7d50\u679c\uff1afalse\r\n<\/code><\/pre>\n<p>\u300cisNumber\u300d\u65b9\u6cd5\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u6765\u5224\u65ad\u53c2\u6570\u7684\u503c\u662f\u5426\u4e3a\u6570\u503c\u3002(\u4f7f\u7528\u6807\u51c6API\u7684Pattern\u7c7b)<\/p>\n<p>\u7531\u4e8e\u300cUtilitySample\u300d\u7c7b\u53ea\u5b9e\u73b0\u4e86\u9759\u6001\u65b9\u6cd5\uff0c\u56e0\u6b64\u5c06\u6784\u9020\u51fd\u6570\u8bbe\u4e3a\u79c1\u6709\uff0c\u4ee5\u9632\u6b62\u4ece\u5916\u90e8\u751f\u6210\u5bf9\u8c61\uff08\u5b9e\u4f8b\uff09\u3002<\/p>\n<p>\u901a\u8fc7\u5c06\u6784\u9020\u51fd\u6570\u8bbe\u4e3a\u79c1\u6709\uff0c\u660e\u786e\u4e86\u5b83\u662f\u4e00\u4e2a\u5b9e\u7528\u5de5\u5177\u7c7b\u3002<\/p>\n<h2>\u53c2\u8003\u8d44\u6599<\/h2>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#8220;\u65b9\u6cd5&#8221;\u7684\u610f\u601d\u662f \u5728\u4e2d\u6587\u4e2d\uff0c\u8fd9\u4e2a\u53e5\u5b50\u7684\u7ffb\u8bd1\u5982\u4e0b\uff1a 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