{"id":691,"date":"2020-02-18T10:24:15","date_gmt":"2020-02-18T02:24:15","guid":{"rendered":"http:\/\/wccass.com\/?p=691"},"modified":"2021-09-06T16:29:04","modified_gmt":"2021-09-06T08:29:04","slug":"java%e5%9f%ba%e7%a1%80%e6%8b%be%e9%81%97staticfinal","status":"publish","type":"post","link":"https:\/\/blog.tongyunli.top\/?p=691","title":{"rendered":"java\u57fa\u7840\u62fe\u9057static&final"},"content":{"rendered":"\n

\u9759\u6001\u6210\u5458<\/p>\n\n\n\n

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\u9759\u6001\u7c7b<\/p>\n\n\n\n
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final<\/p>\n\n\n\n
final\u7279\u70b9\uff1a\n1. \u7528final\u4fee\u9970\u7684\u53d8\u91cf\u8868\u793a\u5e38\u91cf\uff0c\u53ea\u80fd\u88ab\u8d4b\u4e00\u6b21\u503c\uff0c\u4e0d\u80fd\u4fee\u6539\u3002\n\n    final\u4fee\u9970\u7684\u6210\u5458\u53d8\u91cf\u6ca1\u6709\u9ed8\u8ba4\u521d\u59cb\u5316\u503c\uff0c\u9700\u8981\u663e\u5f0f\u521d\u59cb\u5316\n    final\u4fee\u9970\u7684\u57fa\u672c\u7c7b\u578b\u53d8\u91cf\uff1a\u503c\u4e0d\u80fd\u88ab\u4fee\u6539\n    final\u4fee\u9970\u7684\u5f15\u7528\u7c7b\u578b\u53d8\u91cf\uff08\u5bf9\u8c61\uff09\uff1a\u5bf9\u8c61\u5730\u5740\u4e0d\u80fd\u88ab\u4fee\u6539\uff0c\u5bf9\u8c61\u5185\u90e8\u7684\u6210\u5458\u53ef\u4ee5\u88ab\u4fee\u6539\n    \u88ab\u5b9a\u4e49\u4e3afinal\u7684\u5bf9\u8c61\u5f15\u7528\u53ea\u80fd\u6307\u5411\u552f\u4e00\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4e0d\u53ef\u4ee5\u5c06\u5b83\u518d\u6307\u5411\u5176\u4ed6\u5bf9\u8c61\uff0c\u4f46\u662f\u4e00\u4e2a\u5bf9\u8c61\u5185\u90e8\u7684\u503c\u5374\u662f\u53ef\u4ee5\u6539\u53d8\u7684\u3002\n\n    \u88abfinal\u4fee\u9970\u7684\u53d8\u91cf\u662f\u4e00\u4e2a\u5e38\u91cf\uff0c\u5fc5\u987b\u88ab\u8d4b\u503c\u540e\u624d\u80fd\u4f7f\u7528\u3002\u53ef\u4ee5\u5728\u5b9a\u4e49\u65f6\u8d4b\u503c\uff0c\u4e5f\u53ef\u5728\u6784\u9020\u65b9\u6cd5\u4e2d\u8d4b\u503c\u3002\uff08\u53ea\u8981\u5728\u6784\u9020\u65b9\u6cd5\u7ed3\u675f\u524d\u7ed9\u8d4b\u503c\u5c31OK\u3002\uff09\n\n2. \u7528final\u4fee\u9970\u7684\u65b9\u6cd5\u4e0d\u80fd\u88ab\u5b50\u7c7b\u7684\u65b9\u6cd5\u8986\u76d6\uff1b\n\n3. \u7528final\u4fee\u9970\u7684\u7c7b\u4e0d\u80fd\u88ab\u7ee7\u627f\uff0c\u6ca1\u6709\u5b50\u7c7b\uff1b\n      final\u7c7b\u4e0d\u80fd\u88ab\u7ee7\u627f\uff0c\u56e0\u6b64final\u7c7b\u7684\u6210\u5458\u65b9\u6cd5\u6ca1\u6709\u673a\u4f1a\u88ab\u8986\u76d6\uff0c\u9ed8\u8ba4\u90fd\u662ffinal\u7684\u3002\n      \u4f46\u662ffinal\u7c7b\u4e2d\u7684\u6210\u5458\u53d8\u91cf\u53ef\u4ee5\u88ab\u5b9a\u4e49\u4e3afinal\u6216\u975efinal\u5f62\u5f0f\u3002\n      \u5728\u8bbe\u8ba1\u7c7b\u65f6\u5019\uff0c\u5982\u679c\u8fd9\u4e2a\u7c7b\u4e0d\u9700\u8981\u6709\u5b50\u7c7b\uff0c\u7c7b\u7684\u5b9e\u73b0\u7ec6\u8282\u4e0d\u5141\u8bb8\u6539\u53d8\uff0c\u90a3\u4e48\u5c31\u8bbe\u8ba1\u4e3afinal\u7c7b\u3002\n4. final\u4e0d\u80fd\u7528\u6765\u4fee\u9970\u6784\u9020\u65b9\u6cd5\u3002\n\n\u793a\u4f8b\uff1a\n\n3.\npublic class Something {\n   public int addOne(final int x) {\n       return ++x;\n   }\n}\n\n4.\npublic class Something {\n   public static void main(String[] args) {\n       Other o = new Other();\n       new Something().addOne(o);\n   }\n   public void addOne(final Other o) {  \/\/o= 0x1234;\n       o.i++;\n   }\n}<\/code><\/pre>\n\n\n\n
static\u548cfinal
\n    static final\u7528\u6765\u4fee\u9970\u6210\u5458\u53d8\u91cf\u548c\u6210\u5458\u65b9\u6cd5\uff0c\u53ef\u7b80\u5355\u7406\u89e3\u4e3a\u201c\u5168\u5c40\u91cf\u201d\uff01 
\n    \u5bf9\u4e8e\u53d8\u91cf\uff0c\u8868\u793a\u4e00\u65e6\u7ed9\u503c\u5c31\u4e0d\u53ef\u4fee\u6539\uff0c\u5e76\u4e14\u901a\u8fc7\u7c7b\u540d\u53ef\u4ee5\u8bbf\u95ee\u3002 
\n    \u5bf9\u4e8e\u65b9\u6cd5\uff0c\u8868\u793a\u4e0d\u53ef\u8986\u76d6\uff0c\u5e76\u4e14\u53ef\u4ee5\u901a\u8fc7\u7c7b\u540d\u76f4\u63a5\u8bbf\u95ee\u3002<\/p>\n\n\n\n
\u62bd\u8c61\u7c7b\u4e0e\u63a5\u53e3<\/p>\n\n\n\n
\u62bd\u8c61\u7c7b\uff1a\n\u542b\u6709abstract\u4fee\u9970\u7b26\u7684class\u5373\u4e3a\u62bd\u8c61\u7c7b\uff0cabstract \u7c7b\u4e0d\u80fd\u521b\u5efa\u7684\u5b9e\u4f8b\u5bf9\u8c61\u3002\u542b\u6709abstract\u65b9\u6cd5\u7684\u7c7b\u5fc5\u987b\u5b9a\u4e49\u4e3aabstract class\uff0cabstract class\u7c7b\u4e2d\u7684\u65b9\u6cd5\u4e0d\u5fc5\u662f\u62bd\u8c61\u7684\u3002abstract class\u7c7b\u4e2d\u5b9a\u4e49\u62bd\u8c61\u65b9\u6cd5\u5fc5\u987b\u5728\u5177\u4f53(Concrete)\u5b50\u7c7b\u4e2d\u5b9e\u73b0\uff0c\u6240\u4ee5\uff0c\u4e0d\u80fd\u6709\u62bd\u8c61\u6784\u9020\u65b9\u6cd5\u6216\u62bd\u8c61\u9759\u6001\u65b9\u6cd5\u3002\u5982\u679c\u7684\u5b50\u7c7b\u6ca1\u6709\u5b9e\u73b0\u62bd\u8c61\u7236\u7c7b\u4e2d\u7684\u6240\u6709\u62bd\u8c61\u65b9\u6cd5\uff0c\u90a3\u4e48\u5b50\u7c7b\u4e5f\u5fc5\u987b\u5b9a\u4e49\u4e3aabstract\u7c7b\u578b\u3002\n\u63a5\u53e3\uff1a\n\u53ef\u4ee5\u8bf4\u6210\u662f\u62bd\u8c61\u7c7b\u7684\u4e00\u79cd\u7279\u4f8b\uff0c\u63a5\u53e3\u4e2d\u7684\u6240\u6709\u65b9\u6cd5\u90fd\u5fc5\u987b\u662f\u62bd\u8c61\u7684\u3002\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5\u5b9a\u4e49\u9ed8\u8ba4\u4e3apublic abstract\u7c7b\u578b\uff0c\u63a5\u53e3\u4e2d\u7684\u6210\u5458\u53d8\u91cf\u7c7b\u578b\u9ed8\u8ba4\u4e3apublic static final\u3002\n\n\u4e0b\u9762\u6bd4\u8f83\u4e00\u4e0b\u4e24\u8005\u7684\u8bed\u6cd5\u533a\u522b\uff1a\n1. \u62bd\u8c61\u7c7b\u53ef\u4ee5\u6709\u6784\u9020\u65b9\u6cd5\uff0c\u63a5\u53e3\u4e2d\u4e0d\u80fd\u6709\u6784\u9020\u65b9\u6cd5\u3002\n2. \u62bd\u8c61\u7c7b\u4e2d\u53ef\u4ee5\u6709\u666e\u901a\u6210\u5458\u53d8\u91cf\uff0c\u63a5\u53e3\u4e2d\u6ca1\u6709\u666e\u901a\u6210\u5458\u53d8\u91cf\n3. \u62bd\u8c61\u7c7b\u4e2d\u53ef\u4ee5\u5305\u542b\u975e\u62bd\u8c61\u7684\u666e\u901a\u65b9\u6cd5\uff0c\u63a5\u53e3\u4e2d\u7684\u6240\u6709\u65b9\u6cd5\u5fc5\u987b\u90fd\u662f\u62bd\u8c61\u7684\uff0c\u4e0d\u80fd\u6709\u975e\u62bd\u8c61\u7684\u666e\u901a\u65b9\u6cd5\u3002\n4. \u62bd\u8c61\u7c7b\u4e2d\u7684\u62bd\u8c61\u65b9\u6cd5\u7684\u8bbf\u95ee\u7c7b\u578b\u53ef\u4ee5\u662fpublic\uff0cprotected\uff0c\u4f46\u63a5\u53e3\u4e2d\u7684\u62bd\u8c61\u65b9\u6cd5\u53ea\u80fd\u662fpublic\u7c7b\u578b\u7684\uff0c\u5e76\u4e14\u9ed8\u8ba4\u5373\u4e3apublic abstract\u7c7b\u578b\u3002\n5. \u62bd\u8c61\u7c7b\u4e2d\u53ef\u4ee5\u5305\u542b\u9759\u6001\u65b9\u6cd5\uff0c\u63a5\u53e3\u4e2d\u4e0d\u80fd\u5305\u542b\u9759\u6001\u65b9\u6cd5\n6. \u62bd\u8c61\u7c7b\u548c\u63a5\u53e3\u4e2d\u90fd\u53ef\u4ee5\u5305\u542b\u9759\u6001\u6210\u5458\u53d8\u91cf\uff0c\u62bd\u8c61\u7c7b\u4e2d\u7684\u9759\u6001\u6210\u5458\u53d8\u91cf\u7684\u8bbf\u95ee\u7c7b\u578b\u53ef\u4ee5\u4efb\u610f\uff0c\u4f46\u63a5\u53e3\u4e2d\u5b9a\u4e49\u7684\u53d8\u91cf\u53ea\u80fd\u662fpublic static final\u7c7b\u578b\uff0c\u5e76\u4e14\u9ed8\u8ba4\u5373\u4e3apublic static final\u7c7b\u578b\u3002\n7. \u4e00\u4e2a\u7c7b\u53ef\u4ee5\u5b9e\u73b0\u591a\u4e2a\u63a5\u53e3\uff0c\u4f46\u53ea\u80fd\u7ee7\u627f\u4e00\u4e2a\u62bd\u8c61\u7c7b\u3002\n\n\n\n\u63a5\u53e3\u548c\u62bd\u8c61\u7c7b\u7684\u6982\u5ff5\u4e0d\u4e00\u6837\uff08\u901a\u4fd7\u7684\u8bb2\uff09\u3002\n\n\u63a5\u53e3\u662f\u5bf9\u52a8\u4f5c\u7684\u62bd\u8c61\uff0c\u62bd\u8c61\u7c7b\u662f\u5bf9\u6839\u6e90\u7684\u62bd\u8c61\u3002\n\n\u62bd\u8c61\u7c7b\u8868\u793a\u7684\u662f\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u662f\u4ec0\u4e48\u3002\u63a5\u53e3\u8868\u793a\u7684\u662f\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u80fd\u505a\u4ec0\u4e48\u3002\u6bd4\u5982\uff0c\u7537\u4eba\uff0c\u5973\u4eba\uff0c\u8fd9\u4e24\u4e2a\u7c7b\uff08\u5982\u679c\u662f\u7c7b\u7684\u8bdd\u2026\u2026\uff09\uff0c\u4ed6\u4eec\u7684\u62bd\u8c61\u7c7b\u662f\u4eba\u3002\u8bf4\u660e\uff0c\u4ed6\u4eec\u90fd\u662f\u4eba\u3002\u94c1\uff08iron\uff09\u95e8\u3001\u73bb\u7483\u95e8\u8fd9\u4e24\u4e2a\u7c7b\u7684\u62bd\u8c61\u7c7b\u662f\u95e8\uff0c\u8bf4\u660e\u4ed6\u4eec\u90fd\u662f\u95e8\u3002\n\n\u4eba\u53ef\u4ee5\u5403\u4e1c\u897f\uff0c\u72d7\u4e5f\u53ef\u4ee5\u5403\u4e1c\u897f\uff0c\u4f60\u53ef\u4ee5\u628a\u201c\u5403\u4e1c\u897f\u201d\u5b9a\u4e49\u6210\u4e00\u4e2a\u63a5\u53e3\uff0c\u7136\u540e\u8ba9\u8fd9\u4e9b\u7c7b\u53bb\u5b9e\u73b0\u5b83.\n\n\u6240\u4ee5\uff0cJava\u4e2d\u4e00\u4e2a\u7c7b\u53ea\u80fd\u7ee7\u627f\u4e00\u4e2a\u7c7b\uff08\u62bd\u8c61\u7c7b\uff09(\u6b63\u5982\u7537\u4eba\u4e0d\u53ef\u80fd\u540c\u65f6\u662f\u4eba\u548c\u95e8)\uff0c\u4f46\u662f\u53ef\u4ee5\u5b9e\u73b0\u591a\u4e2a\u63a5\u53e3(\u5403\u996d\u63a5\u53e3\u3001\u8d70\u8def\u63a5\u53e3)\u3002\n\n\u5f53\u4f60\u5173\u6ce8\u4e00\u4e2a\u4e8b\u7269\u7684\u672c\u8d28\u7684\u65f6\u5019\uff0c\u7528\u62bd\u8c61\u7c7b\uff1b\u5f53\u4f60\u5173\u6ce8\u4e00\u4e2a\u64cd\u4f5c\u7684\u65f6\u5019\uff0c\u7528\u63a5\u53e3\u3002\n\n\u63a5\u53e3\u53ef\u4ee5\u5b9e\u73b0\u4e5f\u53ef\u4ee5\u7ee7\u627f\uff0c\u62bd\u8c61\u7c7b\u4e0d\u884c\n\u62bd\u8c61\u7c7b\u7684\u529f\u80fd\u8981\u8fdc\u8d85\u8fc7\u63a5\u53e3\uff0c\u4f46\u662f\uff0c\u5b9a\u4e49\u62bd\u8c61\u7c7b\u7684\u4ee3\u4ef7\u9ad8\u3002\u56e0\u4e3a\u9ad8\u7ea7\u8bed\u8a00\u6765\u8bf4\uff08\u4ece\u5b9e\u9645\u8bbe\u8ba1\u4e0a\u6765\u8bf4\u4e5f\u662f\uff09\u6bcf\u4e2a\u7c7b\u53ea\u80fd\u7ee7\u627f\u4e00\u4e2a\u7c7b\u3002\u5728\u8fd9\u4e2a\u7c7b\u4e2d\uff0c\u4f60\u5fc5\u987b\u7ee7\u627f\u6216\u7f16\u5199\u51fa\u5176\u6240\u6709\u5b50\u7c7b\u7684\n\u6240\u6709\u5171\u6027\u3002\u867d\u7136\u63a5\u53e3\u5728\u529f\u80fd\u4e0a\u4f1a\u5f31\u5316\u8bb8\u591a\uff0c\u4f46\u662f\u5b83\u53ea\u662f\u9488\u5bf9\u4e00\u4e2a\u52a8\u4f5c\u7684\u63cf\u8ff0\u3002\u800c\u4e14\u4f60\u53ef\u4ee5\u5728\u4e00\u4e2a\u7c7b\u4e2d\u540c\u65f6\u5b9e\u73b0\u591a\u4e2a\u63a5\u53e3\u3002\u5728\u8bbe\u8ba1\u9636\u6bb5\u4f1a\u964d\u4f4e\u96be\u5ea6\u7684\u3002<\/code><\/pre>\n\n\n\n
\u4ee3\u78011\uff1a
\npackage cn.itcast.employment.staticdemo;<\/p>\n\n\n\n
class Person {
\n    \/\/\u5e74\u9f84
\n    public static int age = 0;<\/p>\n\n\n\n
\/\/\u51fa\u751f\nPerson(){}\n\n\/\/\u514b\u9686\u4eba\nPerson(int age){\n    this.age = age;\n}\n\n\/\/\u8fc7\u4e86\u4e00\u5e74\npublic void grow(){\n    age++;\n}<\/code><\/pre>\n\n\n\n
}<\/p>\n\n\n\n
public class staticDemo {<\/p>\n\n\n\n
Person p = new Person(10);\n\nstatic Person p1,p2;\n\nstatic{\n    System.out.println(\"p1.age =\" + p1.age + \",p2.age =\" + p2.age);\n    p1 = new Person(20);\n    System.out.println(\"p1.age =\" + p1.age + \",p2.age =\" + p2.age);\n    p2 = new Person(30);\n    System.out.println(\"p1.age =\" + p1.age + \",p2.age =\" + p2.age);\n}\n\npublic static void main(String[] args) {\n\n    staticDemo sd = new staticDemo();\n\n    System.out.println(\"p.age =\" + sd.p.age);\n    System.out.println(\"p1.age =\" +p1.age + \",p2.age =\" + p2.age);\n    p1.grow();\n    System.out.println(\"p1.age =\" +p1.age + \",p2.age =\" + p2.age);\n    System.out.println(sd.p.age);\n}<\/code><\/pre>\n\n\n\n
}<\/p>\n\n\n\n
\u4ee3\u78012\uff1a
\n    public class StaticCls {
\n        public static void main(String[] args) {
\n            OuterCls.InnerCls oi = new OuterCls.InnerCls();
\n        }
\n    }<\/p>\n\n\n\n
class OuterCls {\n    public static class InnerCls {\n        InnerCls() {\n            System.out.println(\"InnerCls\");\n        }\n    }\n}<\/code><\/pre>\n\n\n\n
\u5728JAVA\u4e2d\u5982\u4f55\u5b8c\u5168\u8df3\u51fa\u5f53\u524d\u7684\u591a\u91cd\u5d4c\u5957\u5faa\u73af\uff1f<\/p>\n\n\n\n
\u4ee3\u7801\uff1a
\n\u65b9\u5f0f\u4e00\uff1a\u53ef\u4ee5\u5728\u5916\u9762\u7684\u5faa\u73af\u8bed\u53e5\u524d\u5b9a\u4e49\u4e00\u4e2a\u6807\u53f7\uff0c\u7136\u540e\u5728\u91cc\u5c42\u5faa\u73af\u4f53\u7684\u4ee3\u7801\u4e2d\u4f7f\u7528\u5e26\u6709\u6807\u53f7\u7684break \u8bed\u53e5\uff0c\u5373\u53ef\u8df3\u51fa\u5916\u5c42\u5faa\u73af\u3002
\n    ok:for(int i=0;i<arr.length ;i++)
\n    {
\n        for(int j=0;j<arr[i].length;j++)
\n        {<\/p>\n\n\n\n
        if(arr[i][j]  == 5) \n        {\n            break ok;\n        }\n        System.out.println(\u201ci=\u201d + i + \u201c,j=\u201d + j);\n    }\n}  <\/code><\/pre>\n\n\n\n
\u65b9\u5f0f\u4e8c\uff1a\u8ba9\u5916\u5c42\u7684\u5faa\u73af\u6761\u4ef6\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\u53ef\u4ee5\u53d7\u5230\u91cc\u5c42\u5faa\u73af\u4f53\u4ee3\u7801\u7684\u63a7\u5236\uff0c\u4f8b\u5982\uff0c\u8981\u5728\u4e8c\u7ef4\u6570\u7ec4\u4e2d\u67e5\u627e\u5230\u67d0\u4e2a\u6570\u5b57\u3002
\nint arr[][] = {{1,2,3},{4,5,6,7},{9}};
\nboolean found = true;
\nfor(int i=0;i<arr.length && found;i++)
\n    {
\n        for(int j=0;j<arr[i].length;j++)
\n        {<\/p>\n\n\n\n
        if(arr[i][j]  == 5) \n        {\n            found = true;\n            break;\n        }\n        System.out.println(\u201ci=\u201d + i + \u201c,j=\u201d + j);\n    }\n} <\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u9759\u6001\u6210\u5458 \u88abstatic\u4fee\u9970\u7684\u6210\u8bed\u5176\u5b9e\u662f\u4e00\u4e2a\u7c7b\u6210\u5458\u3002 \u5f53\u8fd9\u4e2a\u7c7b\u88ab\u865a\u62df\u673a\u7b2c\u4e00\u6b21\u52a0\u8f7d\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u4e3a\u8be5\u53d8\u91cf\u5206\u914d\u4e86\u5185\u5b58 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[27,22],"class_list":["post-691","post","type-post","status-publish","format-standard","hentry","tag-java","tag-projk"],"_links":{"self":[{"href":"https:\/\/blog.tongyunli.top\/index.php?rest_route=\/wp\/v2\/posts\/691","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.tongyunli.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.tongyunli.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.tongyunli.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.tongyunli.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=691"}],"version-history":[{"count":1,"href":"https:\/\/blog.tongyunli.top\/index.php?rest_route=\/wp\/v2\/posts\/691\/revisions"}],"predecessor-version":[{"id":814,"href":"https:\/\/blog.tongyunli.top\/index.php?rest_route=\/wp\/v2\/posts\/691\/revisions\/814"}],"wp:attachment":[{"href":"https:\/\/blog.tongyunli.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=691"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.tongyunli.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=691"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.tongyunli.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=691"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}