{"id":31598,"date":"2023-06-22T13:26:47","date_gmt":"2023-02-11T01:19:46","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e4%b8%ad%e7%9a%84static%e8%ae%a8%e8%ae%ba\/"},"modified":"2024-04-30T10:10:20","modified_gmt":"2024-04-30T02:10:20","slug":"java%e4%b8%ad%e7%9a%84static%e8%ae%a8%e8%ae%ba","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e4%b8%ad%e7%9a%84static%e8%ae%a8%e8%ae%ba\/","title":{"rendered":"Java\u4e2d\u7684static\u8ba8\u8bba"},"content":{"rendered":"

\u9996\u5148<\/h1>\n

\u8fd9\u7bc7\u6587\u7ae0\u662f2017\u5e74MicroAd\u5723\u8bde\u65e5\u5386\u7b2c18\u5929\u7684\u6587\u7ae0\u3002<\/p>\n

\u6211\u4eca\u60f3\u8ba8\u8bba\u4e00\u4e0b\u5728Java\u4e2d\u5173\u4e8e\u9759\u6001(static)\u7684\u4e00\u4e9b\u5197\u957f\u7684\u8bdd\u9898\uff0c\u8fd9\u53ef\u80fd\u662f\u5e73\u65f6\u4f60\u5e76\u4e0d\u592a\u6ce8\u610f\u6216\u5173\u6ce8\u7684\u3002\u5982\u679c\u6211\u4eec\u73b0\u5728\u4e0d\u8c08\u8bba\u5b83\uff0c\u4ee5\u540e\u53ef\u80fd\u5c31\u518d\u4e5f\u6ca1\u6709\u673a\u4f1a\u4e86\u3002<\/p>\n

\u76ee\u6807<\/h1>\n

\u518d\u5c0f\u7684 static\uff0c\u4e5f\u662f static\uff0c
\n\u5728\u5199\u7b80\u5355\u7684\u5c0f\u6d4b\u9a8c\u7684\u540c\u65f6\uff0c\u5077\u5077\u6574\u7406\u4e00\u4e0b Java \u4e2d\u7684 static \u7279\u6027\uff0c\u518d\u786e\u8ba4\u4e00\u904d\u3002<\/p>\n

\u9759\u6001\u5b57\u6bb5<\/h1>\n

\u9996\u5148\uff0cstatic\u8fd9\u4e2a\u8bcd\u5728\u4e2d\u6587\u4e2d\u610f\u601d\u662f”\u9759\u6001”\u3002\u6240\u8c13”\u52a8\u6001”\u6307\u7684\u662f\uff0c\u65e0\u8bba\u521b\u5efa\u591a\u5c11\u4e2a\u5b9e\u4f8b\uff0c\u7c7b\u4e2d\u7684\u8fd9\u4e2a\u53d8\u91cf\u90fd\u53ea\u6709\u4e00\u4e2a\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u7ed9\u5b57\u6bb5\u6dfb\u52a0static\u6765\u5171\u4eab\u4fe1\u606f\u548c\u8d44\u6e90\uff0c\u5728\u591a\u4e2a\u5b9e\u4f8b\u4e4b\u95f4\u5171\u4eab\u3002\u53ef\u4ee5\u901a\u8fc7\u7c7b\u540d.\u5b57\u6bb5\u540d\u6765\u8c03\u7528\uff0c\u5373\u4f7f\u901a\u8fc7\u521b\u5efa\u5b9e\u4f8b\u8c03\u7528\u4e5f\u53ef\u4ee5\u8bbf\u95ee\u76f8\u540c\u7684\u5185\u5bb9\u3002<\/p>\n

\u901a\u8fc7\u4f7f\u7528final static\u8fdb\u884c\u5e38\u91cf\u5b9a\u4e49\uff0c\u53ef\u4ee5\u9632\u6b62\u6bcf\u6b21\u521b\u5efa\u5b9e\u4f8b\u65f6\u76f8\u540c\u7684\u503c\u88ab\u590d\u5236\u5230\u5bf9\u8c61\u4e2d\uff0c\u4ece\u800c\u8282\u7701\u5185\u5b58\u3002<\/p>\n

public<\/span> final<\/span> static<\/span> String<\/span> KEY<\/span> =<\/span> \"happy-toilet\"<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u662f\u4e00\u4e2a\u53ef\u4ee5\u5728\u4efb\u4f55\u5730\u65b9\u53ec\u5524\u7684Happy Toilet\u7684\u6052\u5b9a\u503c\u3002<\/p>\n
\u9759\u6001\u65b9\u6cd5\uff08\u7c7b\u65b9\u6cd5\uff09<\/h1>\n
\u9759\u6001\u65b9\u6cd5\u4e0d\u5c5e\u4e8e\u7c7b\u7684\u5b9e\u4f8b\uff0c\u800c\u662f\u5c5e\u4e8e\u7c7b\u672c\u8eab\u3002
\n\u53ef\u4ee5\u901a\u8fc7\u7c7b\u540d.\u65b9\u6cd5\u540d\u8fdb\u884c\u8c03\u7528\uff0c\u5982\u679c\u662f\u51fd\u6570\u5f0f\u63a5\u53e3\u7684\u65b9\u6cd5\u5f15\u7528\uff0c\u5219\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7\u7c7b\u540d::\u65b9\u6cd5\u540d\u8fdb\u884c\u8c03\u7528\u3002
\n\u9759\u6001\u6210\u5458\u4e0e\u9759\u6001\u5b57\u6bb5\u4e00\u8d77\u88ab\u79f0\u4e3a\u9759\u6001\u6210\u5458\u3002
\n\u6ca1\u6709static\u4fee\u9970\u7684\u4e00\u822c\u65b9\u6cd5\u88ab\u79f0\u4e3a\u975e\u9759\u6001\u65b9\u6cd5\u6216\u5b9e\u4f8b\u65b9\u6cd5\u3002<\/p>\n
\u4ee5\u4e0b\u662fJava8\u4e4b\u540e\uff0c\u51fd\u6570\u5f0f\u63a5\u53e3\u65b9\u6cd5\u5f15\u7528\u4e2d\u9759\u6001\u65b9\u6cd5\u548c\u5b9e\u4f8b\u65b9\u6cd5\u8c03\u7528\u7684\u533a\u522b\u3002<\/p>\n
public<\/span> class<\/span> MethodReference<\/span> {<\/span>\r\n\r\n  public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n    \/\/ static \u30e1\u30bd\u30c3\u30c9<\/span>\r\n    wakeUp<\/span>(<\/span>MethodReference:<\/span>:<\/span>printWakeUp<\/span>);<\/span>\r\n\r\n    System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>\" and \"<\/span>);<\/span>\r\n\r\n    \/\/ \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9<\/span>\r\n    MethodReference<\/span> mr<\/span> =<\/span> new<\/span> MethodReference<\/span>();<\/span>\r\n    mr<\/span>.<\/span>goToilet<\/span>(<\/span>mr:<\/span>:<\/span>printGoToilet<\/span>);<\/span>\r\n  }<\/span>\r\n\r\n  interface<\/span> Human<\/span> {<\/span>\r\n    void<\/span> doSomething<\/span>();<\/span>\r\n  }<\/span>\r\n\r\n  static<\/span> void<\/span> wakeUp<\/span>(<\/span>Human<\/span> human<\/span>)<\/span> {<\/span>\r\n    human<\/span>.<\/span>doSomething<\/span>();<\/span>\r\n  }<\/span>\r\n\r\n  static<\/span> void<\/span> printWakeUp<\/span>()<\/span> {<\/span>\r\n    String<\/span> wakeUp<\/span> =<\/span> \"wake up\"<\/span>;<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>wakeUp<\/span>);<\/span>\r\n  }<\/span>\r\n\r\n  void<\/span> goToilet<\/span>(<\/span>Human<\/span> human<\/span>)<\/span> {<\/span>\r\n    human<\/span>.<\/span>doSomething<\/span>();<\/span>\r\n  }<\/span>\r\n\r\n  void<\/span> printGoToilet<\/span>()<\/span> {<\/span>\r\n    String<\/span> toilet<\/span> =<\/span> \"happy toilet\"<\/span>;<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>toilet<\/span>);<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u9192\u4f86\u4e26\u958b\u5fc3\u5730\u4f7f\u7528\u5ec1\u6240\u7684\u7d50\u679c\u3002<\/p>\n
\u65e0\u6cd5\u91cd\u5199<\/h3>\n
public<\/span> class<\/span> StaticPractice<\/span> {<\/span>\r\n\r\n  public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n\r\n    Human<\/span> developer<\/span> =<\/span> new<\/span> Developer<\/span>();<\/span>\r\n\r\n    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>developer<\/span>.<\/span>getMorning<\/span>());<\/span>\r\n\r\n  }<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> Human<\/span> {<\/span>\r\n  static<\/span> String<\/span> morning<\/span> =<\/span> \"Happy Toilet\"<\/span>;<\/span>\r\n\r\n  static<\/span> String<\/span> getMorning<\/span>()<\/span> {<\/span>\r\n    return<\/span> morning<\/span>;<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> Developer<\/span> extends<\/span> Human<\/span> {<\/span>\r\n  static<\/span> String<\/span> morning<\/span> =<\/span> \"Happy Coding\"<\/span>;<\/span>\r\n\r\n  static<\/span> String<\/span> getMorning<\/span>()<\/span> {<\/span>\r\n    return<\/span> morning<\/span>;<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5f53\u7136\u7684\uff0c\u7ed3\u679c\u662f Happy Toilet\u3002
\n\u5c06\u201cDeveloper developer = new Developer();\u201d\u4fee\u6539\u4e3a\u201c\u4e00\u5fdc Happy Coding \u662f\u53ef\u4ee5\u7684\u201d\u3002<\/p>\n
\u65e0\u6cd5\u88aboverride\uff0c\u6240\u4ee5\u6211\u4eec\u5fc5\u987b\u521b\u5efa\u4e00\u4e2a\u5b9e\u4f8b\u6765\u8868\u793a\u8fd9\u4e2a\u6982\u5ff5\uff0c\u5e76\u4ece\u8be5\u5b9e\u4f8b\u4e2d\u8c03\u7528\u65b9\u6cd5\uff0c\u4f46\u5f52\u6839\u7ed3\u5e95\uff0c\u9759\u6001\u65b9\u6cd5\u672c\u6765\u5c31\u662f\u8fd9\u6837\u7684\u3002<\/p>\n
 Human<\/span>.<\/span>getMorning<\/span>();<\/span>\r\n Developer<\/span>.<\/span>getMorning<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u5728\u6ca1\u6709\u7ecf\u8fc7\u5b9e\u4f8b\u6765\u8fdb\u884c\u7684\u60c5\u51b5\u4e0b\uff0c\u6700\u597d\u901a\u8fc7\u7c7b\u672c\u8eab\u6765\u8fdb\u884c\u5f15\u7528\u3002<\/p>\n
\u5b9e\u9645\u4e0a\uff0c\u5c06\u4e0a\u8ff0\u4ee3\u7801\u76f4\u63a5\u79fb\u690d\u5230 IntelliJ \u4e2d\u8bd5\u8bd5\u770b\u3002<\/p>\n
\"alert.png\"<\/div>\n
\u8bf7\u6ce8\u610f\uff0c\u88ab\u7c7b\u672c\u8eab\u6ca1\u6709\u5f15\u7528\u7684\u9759\u6001\u65b9\u6cd5\u3002<\/p>\n
\uff08\u7279\u522b\u611f\u8c22 @kawamnv \u3055\u3093\uff09<\/p>\n
\u516c\u5171\u7684\u9759\u6001\u7684\u4e3b\u65b9\u6cd5(String [] args)<\/h3>\n
\u5f53\u8c03\u7528\u4e3b\u65b9\u6cd5\u65f6\uff0c\u7531\u4e8e\u5185\u5b58\u4e2d\u5c1a\u4e0d\u5b58\u5728\u5b9e\u4f8b\uff0c\u6240\u4ee5\u5373\u4f7f\u4e3b\u65b9\u6cd5\u6240\u5728\u7684\u7c7b\u5c1a\u672a\u88ab\u5b9e\u4f8b\u5316\uff0c\u4e5f\u9700\u8981\u6267\u884c\u3002<\/p>\n
\u9759\u6001\u7c7b\uff08\u9759\u6001\u5185\u90e8\u7c7b\uff09<\/h1>\n
\u5728\u7c7b\u4e2d\u6709\u4e09\u79cd\u7c7b\u578b\u7684\u5185\u90e8\u7c7b\uff1a\u6210\u5458\u7c7b\u3001\u5c40\u90e8\u7c7b\u548c\u533f\u540d\u7c7b\u3002
\n\u9759\u6001\u6210\u5458\u7c7b\u662f\u5176\u4e2d\u7684\u4e00\u79cd\uff0c\u58f0\u660e\u4f4d\u7f6e\u5728\u7c7b\u5757\u4e2d\uff08\u4e0e\u5b57\u6bb5\u548c\u65b9\u6cd5\u7684\u4f4d\u7f6e\u76f8\u540c\uff09\u3002
\n\u7136\u800c\u4e25\u683c\u6765\u8bf4\uff0c\u9759\u6001\u6210\u5458\u7c7b\u5f88\u96be\u79f0\u4e3a\u5185\u90e8\u7c7b\uff0c\u66f4\u6b63\u786e\u7684\u8868\u8fbe\u5e94\u8be5\u662f\u5b83\u662f\u4e00\u4e2a\u5b8c\u5168\u4e0d\u540c\u7684\u7c7b\u3002<\/p>\n
\u5f53\u6211\u4eec\u5c06\u5305\u88f9\u5185\u90e8\u7c7b\u7684\u7c7b\u79f0\u4e3a\u5916\u90e8\u7c7b\u65f6\uff0c\u5916\u90e8\u7c7b\u4e0e\u5176\u5b9e\u4f8b\u7684\u5173\u7cfb\u76f8\u5bf9\u8f83\u5f31\uff0c\u5e76\u4e14\u53ef\u4ee5\u8bbf\u95ee\u5916\u90e8\u7c7b\u7684\u9759\u6001\u6210\u5458\u3002<\/p>\n
\u4e0e\u5176\u4ed6\u9759\u6001\u5143\u7d20\u4e00\u6837\uff0c\u53ef\u4ee5\u901a\u8fc7\u5916\u90e8\u7c7b\u540d.\u6210\u5458\u7c7b\u540d\u6765\u4f7f\u7528\u3002<\/p>\n
class<\/span> Outer<\/span> {<\/span> \/\/ \u5916\u90e8\u30af\u30e9\u30b9<\/span>\r\n\r\n  \/\/ \u30e1\u30f3\u30d0\u30af\u30e9\u30b9\u2780 static \u30af\u30e9\u30b9<\/span>\r\n  static<\/span> class<\/span> StaticInner<\/span> {<\/span>\r\n    private<\/span> Integer<\/span> in<\/span>;<\/span>\r\n\r\n    public<\/span> Integer<\/span> getIn<\/span>()<\/span> {<\/span>\r\n      return<\/span> in<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> void<\/span> setIn<\/span>(<\/span>Integer<\/span> in<\/span>)<\/span> {<\/span>\r\n      this<\/span>.<\/span>in<\/span> =<\/span> in<\/span>;<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n\r\n  \/\/ \u30e1\u30f3\u30d0\u30af\u30e9\u30b9\u2781 \u53b3\u5bc6\u7684\u306a\u30e1\u30f3\u30d0\u30af\u30e9\u30b9<\/span>\r\n  class<\/span> Inner<\/span> {<\/span>\r\n    private<\/span> String<\/span> str<\/span>;<\/span>\r\n\r\n    public<\/span> String<\/span> getStr<\/span>()<\/span> {<\/span>\r\n      return<\/span> str<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> void<\/span> setStr<\/span>(<\/span>String<\/span> str<\/span>)<\/span> {<\/span>\r\n      this<\/span>.<\/span>str<\/span> =<\/span> str<\/span>;<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4e0b\u9762\u662f\u5728\u65e0\u5173\u7684\u7c7b\u548c\u4e3b\u65b9\u6cd5\u4e2d\u8c03\u7528\u7684\u65b9\u5f0f\u3002<\/p>\n
class<\/span> Execute<\/span> {<\/span>\r\n  public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n    \/\/ static \u30af\u30e9\u30b9<\/span>\r\n    Outer<\/span>.<\/span>StaticInner<\/span> staticInner<\/span> =<\/span> new<\/span> Outer<\/span>.<\/span>StaticInner<\/span>();<\/span>\r\n\r\n    \/\/ \u53b3\u5bc6\u7684\u306a\u30e1\u30f3\u30d0\u30af\u30e9\u30b9<\/span>\r\n    Outer<\/span> outer<\/span> =<\/span> new<\/span> Outer<\/span>();<\/span>\r\n    Outer<\/span>.<\/span>Inner<\/span> inner<\/span> =<\/span> outer<\/span>.<\/span>new<\/span> Inner<\/span>();<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6211\u5728\u4e0a\u8ff0\u4f8b\u5b50\u4e2d\u52a0\u5165\u4e86\u4e00\u4e2a\u4f8b\u5b50\uff0c\u4e25\u683c\u7684\u6210\u5458\u7c7b\u4e0e\u5916\u90e8\u7c7b\u7684\u5b9e\u4f8b\u6709\u7740\u5f3a\u70c8\u7684\u5173\u8054\uff0c\u56e0\u6b64\u5982\u679c\u6ca1\u6709\u5916\u90e8\u7c7b\u7684\u5b9e\u4f8b\uff0c\u5c31\u65e0\u6cd5\u521b\u5efa\u65b0\u7684\u5b9e\u4f8b\u3002\u7531\u4e8e\u5b83\u4e0d\u662f\u9759\u6001\u7684\uff0c\u6240\u4ee5\u4e5f\u53ef\u4ee5\u8bbf\u95ee\u975e\u9759\u6001\u6210\u5458\u3002<\/p>\n
\u9759\u6001\u521d\u59cb\u5316\u7a0b\u5e8f<\/h1>\n
static<\/span> {<\/span>\r\n  \/\/ \u51e6\u7406<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u9759\u6001\u521d\u59cb\u5316\u5757\u662f\u5728\u7c7b\u52a0\u8f7d\uff08\u52a0\u8f7d.class\u6587\u4ef6\uff09\u65f6\u6267\u884c\u4e00\u6b21\u7684\u5757\u3002
\n\u5b83\u7528\u4e8e\u7f16\u5199\u5728\u5b9e\u4f8b\u5316\u67d0\u4e2a\u7c7b\u4e4b\u524d\u6216\u5728\u4e3b\u65b9\u6cd5\u4e4b\u524d\u8981\u8c03\u7528\u6267\u884c\u7684\u5904\u7406\u3002
\n\u5f53\u7136\uff0c\u53ea\u80fd\u5bf9\u9759\u6001\u5bf9\u8c61\u8fdb\u884c\u7f16\u5199\u3002<\/p>\n
\u6211\u66fe\u7ecf\u601d\u8003\u8fc7\u8fd9\u662f\u5426\u6709\u7528\u9014\u3002<\/p>\n
public<\/span> final<\/span> static<\/span> String<\/span> VALUE<\/span>;<\/span>\r\n\r\nstatic<\/span> {<\/span>\r\n  VALUE<\/span> =<\/span> makeValue<\/span>();<\/span>\r\n}<\/span> \r\n\r\n\/**\r\n * \u7279\u5b9a\u6761\u4ef6\u4e0b\u3067\u5024\u3092\u52d5\u7684\u306b\u751f\u6210\u3059\u308b\r\n * @return value \u751f\u6210\u3057\u305f\u5024\r\n *\/<\/span>\r\nprivate<\/span> static<\/span> String<\/span> makeValue<\/span>()<\/span> {<\/span>\r\n  \/\/ omit<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u524d\u51e0\u5929\uff0c\u6211\u7a81\u7136\u6709\u673a\u4f1a\u5c1d\u8bd5\u4e86\u8fd9\u79cd\u7528\u6cd5\u3002
\n\u56e0\u4e3a\u6211\u60f3\u5728\u5b9e\u4f8b\u5316\u4e4b\u524d\u7684\u65e9\u671f\u9636\u6bb5\uff0c\u521b\u5efa\u4e00\u4e2a\u65b0\u503c\u5e76\u5728\u6574\u4e2a\u8fc7\u7a0b\u4e2d\u91cd\u590d\u4f7f\u7528\u5b83\uff0c\u6240\u4ee5\u6b63\u597d\u8fd9\u6837\u505a\u975e\u5e38\u9002\u5408\u3002<\/p>\n
\u6784\u9020\u51fd\u6570\u548c\u9759\u6001\u521d\u59cb\u5316\u5668<\/h3>\n
class<\/span> Something<\/span> {<\/span>\r\n\r\n  void<\/span> printA<\/span>()<\/span> {<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>\"t\"<\/span>);<\/span>\r\n  }<\/span>\r\n\r\n  void<\/span> printB<\/span>()<\/span> {<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>\"e\"<\/span>);<\/span>\r\n  }<\/span>\r\n\r\n  Something<\/span> ()<\/span> {<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>\"l\"<\/span>);<\/span>\r\n    printB<\/span>();<\/span>\r\n  }<\/span>\r\n\r\n  static<\/span> {<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>\"i\"<\/span>);<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> StaticTest<\/span> {<\/span>\r\n  static<\/span> {<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>\"T\"<\/span>);<\/span>\r\n  }<\/span>\r\n\r\n  public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span> []<\/span> args<\/span>)<\/span> {<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>\"o\"<\/span>);<\/span>\r\n    new<\/span> Something<\/span>().<\/span>printA<\/span>();<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7b54\u6848\u53ea\u9700\u8981\u4e00\u79cd\u9009\u9879\uff1a\u6700\u7ec8\u7ed3\u679c\u662f\u5395\u6240\u3002
\n\u9759\u6001\u521d\u59cb\u5316\u7a0b\u5e8f\u53ef\u4ee5\u5728\u5b9e\u4f8b\u5316\u4e4b\u524d\u88ab\u8c03\u7528\uff0c\u65e9\u4e8e\u6784\u9020\u51fd\u6570\u3002<\/p>\n
\u9759\u6001\u5bfc\u5165\u58f0\u660e<\/h1>\n
Java5\u4ee5\u540e\u5f15\u5165\u4e86\u8be5\u529f\u80fd\u3002<\/p>\n
\u4ee5\u4e0b\u662f\u524d\u6b21\u53d1\u5e03\u65f6\u7528\u4e8e\u521b\u5efa\u7ea6\u675f\u6ce8\u91ca\u7684\u6e90\u4ee3\u7801\u3002<\/p>\n
import<\/span> static<\/span> java<\/span>.<\/span>lang<\/span>.<\/span>annotation<\/span>.<\/span>ElementType<\/span>.<\/span>FIELD<\/span>;<\/span>\r\nimport<\/span> static<\/span> java<\/span>.<\/span>lang<\/span>.<\/span>annotation<\/span>.<\/span>RetentionPolicy<\/span>.<\/span>RUNTIME<\/span>;<\/span>\r\n\r\n@Target<\/span>({<\/span>FIELD<\/span>})<\/span>\r\n@Retention<\/span>(<\/span>RUNTIME<\/span>)<\/span>\r\n@Constraint<\/span>(<\/span>validatedBy<\/span> =<\/span> {<\/span>CustomSizeValidator<\/span>.<\/span>class<\/span>})<\/span>\r\npublic<\/span> @interface<\/span> CustomSize<\/span> {<\/span>\r\n  \/\/ omit<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5b9e\u9645\u4e0a\uff0c\u7531\u4e8eElementType\u548cRetentionPolicy\u662f\u5177\u6709\u8f83\u957f\u5305\u540d\u7684\u679a\u4e3e\u7c7b\u578b\uff0c\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u50cf\u4e0a\u9762\u90a3\u6837\u7b80\u6d01\u5730\u7f16\u5199\u4ee3\u7801\u3002<\/p>\n
\u5982\u679c\u662f\u5916\u90e8\u7c7b\u7684\u9759\u6001\u6210\u5458\uff0c\u5219\u4e0d\u4e00\u5b9a\u975e\u8981\u4f7f\u7528\u679a\u4e3e\uff0c\u53ef\u4ee5\u4f7f\u7528\u5176\u4ed6\u65b9\u5f0f\u8fdb\u884c\u5229\u7528\u3002<\/p>\n
import<\/span> static<\/span> java<\/span>.<\/span>lang<\/span>.<\/span>System<\/span>.*;<\/span>\r\nimport<\/span> static<\/span> java<\/span>.<\/span>lang<\/span>.<\/span>Math<\/span>.*;<\/span>\r\n<\/code><\/pre>\n
\u7ed3\u675f\u4e86<\/h1>\n
\u65e9\u4e0a\u7b2c\u4e00\u4e2a\u5982\u5395\u7684\u65f6\u95f4\uff0c\u91cd\u65b0\u786e\u8ba4\u57fa\u7840\u6587\u6cd5\u975e\u5e38\u91cd\u8981\uff08\u5c0f\u58f0\u8bf4\uff09\u3002<\/p>\n
\u4ee5\u4e0a<\/p>\n","protected":false},"excerpt":{"rendered":"
\u9996\u5148 \u8fd9\u7bc7\u6587\u7ae0\u662f2017\u5e74MicroAd\u5723\u8bde\u65e5\u5386\u7b2c18\u5929\u7684\u6587\u7ae0\u3002 \u6211\u4eca\u60f3\u8ba8\u8bba\u4e00\u4e0b\u5728Java\u4e2d\u5173\u4e8e\u9759\u6001(stat […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31598","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nJava\u4e2d\u7684static\u8ba8\u8bba - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u4e2d\u7684static\u8ba8\u8bba\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u4e2d\u7684static\u8ba8\u8bba\" \/>\n<meta property=\"og:description\" content=\"\u9996\u5148 \u8fd9\u7bc7\u6587\u7ae0\u662f2017\u5e74MicroAd\u5723\u8bde\u65e5\u5386\u7b2c18\u5929\u7684\u6587\u7ae0\u3002 \u6211\u4eca\u60f3\u8ba8\u8bba\u4e00\u4e0b\u5728Java\u4e2d\u5173\u4e8e\u9759\u6001(stat […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u4e2d\u7684static\u8ba8\u8bba\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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