{"id":29505,"date":"2024-11-25T15:26:51","date_gmt":"2024-11-25T07:26:51","guid":{"rendered":"https:\/\/fwq.ai\/blog\/29505\/"},"modified":"2024-11-25T15:26:51","modified_gmt":"2024-11-25T07:26:51","slug":"%e7%94%a8java%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%e4%b8%ad%e7%9a%84%e8%a7%82%e5%af%9f%e8%80%85%e6%a8%a1%e5%bc%8f%e5%bc%80%e5%8f%91%e5%be%ae%e4%bf%a1%e5%85%ac%e4%bc%97%e5%8f%b7%e7%9a%84%e5%ae%9e","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/29505\/","title":{"rendered":"\u7528Java\u8bbe\u8ba1\u6a21\u5f0f\u4e2d\u7684\u89c2\u5bdf\u8005\u6a21\u5f0f\u5f00\u53d1\u5fae\u4fe1\u516c\u4f17\u53f7\u7684\u5b9e\u4f8b\u4ee3\u7801"},"content":{"rendered":"

\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u4ecb\u7ecd\u4e86\u7528Java\u4e2d\u7684\u5f00\u53d1\u5fae\u4fe1\u516c\u4f17\u53f7\u7684\u4f8b\u5b50,\u8fd9\u91ccJava\u7684\u5fae\u4fe1SDK\u7b49\u90e8\u5206\u4fbf\u4e0d\u518d\u8be6\u8ff0,\u53ea\u6ce8\u91cd\u5173\u952e\u90e8\u5206\u548c\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u89c2\u5bdf\u8005\u6a21\u5f0f\u4f18\u70b9\u7684\u4f53\u73b0,\u9700\u8981\u7684\u670b\u53cb\u53ef\u4ee5\u53c2\u8003\u4e0b<\/p>\n

\u8fd8\u8bb0\u5f97\u8b66\u532a\u7247\u4e0a\uff0c\u532a\u5f92\u4eec\u662f\u600e\u4e48\u914d\u5408\u5b9e\u65bd\u72af\u7f6a\u7684\u5417\uff1f\u4e00\u4e2a\u56e2\u4f19\u5728\u8fdb\u884c\u76d7\u7a83\u7684\u65f6\u5019\uff0c\u603b\u6709\u4e00\u4e24\u4e2a\u4eba\u5728\u95e8\u53e3\u628a\u98ce\u2014\u2014\u5982\u679c\u6709\u4ec0\u4e48\u98ce\u5439\u8349\u52a8\uff0c\u5219\u4f1a\u7acb\u5373\u901a\u77e5\u91cc\u9762\u7684\u540c\u4f19\u7d27\u6025\u64a4\u9000\u3002\u4e5f\u8bb8\u653e\u98ce\u7684\u4eba\u5e76\u4e0d\u4e00\u5b9a\u8ba4\u8bc6\u91cc\u9762\u7684\u6bcf\u4e00\u4e2a\u540c\u4f19\uff1b\u800c\u5728\u91cc\u9762\u4e5f\u8bb8\u6709\u65b0\u6765\u7684\u5c0f\u5f1f\u4e0d\u8ba4\u8bc6\u8fd9\u4e2a\u653e\u98ce\u7684\u3002\u4f46\u662f\u8fd9\u6ca1\u4ec0\u4e48\uff0c\u8fd9\u4e2a\u5f71\u54cd\u4e0d\u4e86\u4ed6\u4eec\u4e4b\u95f4\u7684\u901a\u8baf\uff0c\u56e0\u4e3a\u4ed6\u4eec\u4e4b\u95f4\u6709\u65e9\u5df2\u5546\u5b9a\u597d\u7684\u6697\u53f7\u3002
\u5475\u5475\uff0c\u4e0a\u9762\u63d0\u5230\u7684\u653e\u98ce\u8005\u3001\u5077\u7a83\u8005\u4e4b\u95f4\u7684\u5173\u7cfb\u5c31\u662f\u89c2\u5bdf\u8005\u6a21\u5f0f\u5728\u73b0\u5b9e\u4e2d\u7684\u6d3b\u751f\u751f\u7684\u4f8b\u5b50\u3002<\/p>\n

\u89c2\u5bdf\u8005\uff08Observer\uff09\u6a21\u5f0f\u53c8\u540d\u53d1\u5e03-\u8ba2\u9605\uff08Publish\/Subscribe\uff09\u6a21\u5f0f\u3002GOF\u7ed9\u89c2\u5bdf\u8005\u6a21\u5f0f\u5982\u4e0b\u5b9a\u4e49\uff1a\u5b9a\u4e49\u95f4\u7684\u4e00\u79cd\u4e00\u5bf9\u591a\u7684\u4f9d\u8d56\u5173\u7cfb\uff0c\u5f53\u4e00\u4e2a\u5bf9\u8c61\u7684\u53d1\u751f\u6539\u53d8\u65f6\uff0c\u6240\u6709\u4f9d\u8d56\u4e8e\u5b83\u7684\u5bf9\u8c61\u90fd\u5f97\u5230\u901a\u77e5\u5e76\u88ab\u81ea\u52a8\u66f4\u65b0\u3002
\u5728\u8fd9\u91cc\u5148\u8bb2\u4e00\u4e0b\u8bbe\u8ba1\u7684\u4e00\u4e2a\u91cd\u8981\u539f\u5219\u2014\u2014\u5355\u4e00\u804c\u8d23\u539f\u5219\u3002\u56e0\u6b64\u7cfb\u7edf\u7684\u6bcf\u4e2a\u5bf9\u8c61\u5e94\u8be5\u5c06\u91cd\u70b9\u653e\u5728\u95ee\u9898\u57df\u4e2d\u7684\u79bb\u6563\u62bd\u8c61\u4e0a\u3002\u56e0\u6b64\u7406\u60f3\u7684\u60c5\u51b5\u4e0b\uff0c\u4e00\u4e2a\u5bf9\u8c61\u53ea\u505a\u4e00\u4ef6\u4e8b\u60c5\u3002\u8fd9\u6837\u5728\u5f00\u53d1\u4e2d\u4e5f\u5c31\u5e26\u6765\u4e86\u8bf8\u591a\u7684\u597d\u5904\uff1a\u63d0\u4f9b\u4e86\u91cd\u7528\u6027\u548c\u7ef4\u62a4\u6027\uff0c\u4e5f\u662f\u8fdb\u884c\u91cd\u6784\u7684\u826f\u597d\u7684\u57fa\u7840\u3002
\u56e0\u6b64\u51e0\u4e4e\u6240\u6709\u7684\u8bbe\u8ba1\u6a21\u5f0f\u90fd\u662f\u57fa\u4e8e\u8fd9\u4e2a\u57fa\u672c\u7684\u6765\u7684\u3002\u89c2\u5bdf\u8005\u6a21\u5f0f\u7684\u8d77\u6e90\u6211\u89c9\u5f97\u5e94\u8be5\u662f\u5728GUI\u548c\u4e1a\u52a1\u6570\u636e\u7684\u5904\u7406\u4e0a\uff0c\u56e0\u4e3a\u73b0\u5728\u7edd\u5927\u591a\u6570\u8bb2\u89e3\u89c2\u5bdf\u8005\u6a21\u5f0f\u7684\u4f8b\u5b50\u90fd\u662f\u8fd9\u4e00\u9898\u6750\u3002\u4f46\u662f\u89c2\u5bdf\u8005\u6a21\u5f0f\u7684\u5e94\u7528\u51b3\u4e0d\u4ec5\u9650\u4e8e\u6b64\u4e00\u65b9\u9762\u3002<\/p>\n

\u597d\u4e86\uff0c\u5bf9\u4e8e\u5b9a\u4e49\u7684\u7406\u89e3\u603b\u662f\u9700\u8981\u5b9e\u4f8b\u6765\u89e3\u6790\u7684\uff0c\u5982\u4eca\u7684\u5fae\u4fe1\u670d\u52a1\u53f7\u76f8\u5f53\u706b\u554a\uff0c\u4e0b\u9762\u5c31\u4ee5\u5fae\u4fe1\u670d\u52a1\u53f7\u4e3a\u80cc\u666f\uff0c\u7ed9\u5927\u5bb6\u4ecb\u7ecd\u89c2\u5bdf\u8005\u6a21\u5f0f\u3002
\u770b\u4e00\u5f20\u56fe\uff1a<\/p>\n

\"\u7528Java\u8bbe\u8ba1\u6a21\u5f0f\u4e2d\u7684\u89c2\u5bdf\u8005\u6a21\u5f0f\u5f00\u53d1\u5fae\u4fe1\u516c\u4f17\u53f7\u7684\u5b9e\u4f8b\u4ee3\u7801\u63d2\u56fe\"<\/p>\n

\u5176\u4e2d\u6bcf\u4e2a\u4f7f\u7528\u8005\u90fd\u6709\u4e0a\u56fe\u4e2d\u76843\u6761\u7ebf\uff0c\u4e3a\u4e86\u4f7f\u56fe\u7247\u6e05\u6670\u7701\u7565\u4e86\u3002
\u5982\u4e0a\u56fe\u6240\u793a\uff0c\u670d\u52a1\u53f7\u5c31\u662f\u6211\u4eec\u7684\u4e3b\u9898\uff0c\u4f7f\u7528\u8005\u5c31\u662f\u89c2\u5bdf\u8005\u3002\u73b0\u5728\u6211\u4eec\u660e\u786e\u4e0b\u529f\u80fd\uff1a
1\u3001\u670d\u52a1\u53f7\u5c31\u662f\u4e3b\u9898\uff0c\u4e1a\u52a1\u5c31\u662f\u63a8\u9001\u6d88\u606f
2\u3001\u89c2\u5bdf\u8005\u53ea\u9700\u8981\u8ba2\u9605\u4e3b\u9898\uff0c\u53ea\u8981\u6709\u65b0\u7684\u6d88\u606f\u5c31\u4f1a\u9001\u6765
3\u3001\u5f53\u4e0d\u60f3\u8981\u6b64\u4e3b\u9898\u6d88\u606f\u65f6\uff0c\u53d6\u6d88\u8ba2\u9605
4\u3001\u53ea\u8981\u670d\u52a1\u53f7\u8fd8\u5728\uff0c\u5c31\u4f1a\u4e00\u76f4\u6709\u4eba\u8ba2\u9605
\u597d\u4e86\uff0c\u73b0\u5728\u6211\u4eec\u6765\u770b\u770b\u89c2\u5bdf\u8005\u6a21\u5f0f\u7684\u7c7b\u56fe\uff1a<\/p>\n

\"\u7528Java\u8bbe\u8ba1\u6a21\u5f0f\u4e2d\u7684\u89c2\u5bdf\u8005\u6a21\u5f0f\u5f00\u53d1\u5fae\u4fe1\u516c\u4f17\u53f7\u7684\u5b9e\u4f8b\u4ee3\u7801\u63d2\u56fe1\"<\/p>\n

\u63a5\u4e0b\u6765\u5c31\u662f\u4ee3\u7801\u65f6\u95f4\u4e86\uff0c\u6211\u4eec\u6a21\u62df\u4e00\u4e2a\u5fae\u4fe13D\u5f69\u7968\u670d\u52a1\u53f7\uff0c\u548c\u4e00\u4e9b\u8ba2\u9605\u8005\u3002
\u9996\u5148\u5f00\u59cb\u5199\u6211\u4eec\u7684\u4e3b\u9898\uff0c\u548c\u89c2\u5bdf\u8005\u63a5\u53e3\uff1a<\/p>\n

package com.zhy.pattern.observer; \r\n \r\n\/** \r\n * \u4e3b\u9898\u63a5\u53e3\uff0c\u6240\u6709\u7684\u4e3b\u9898\u5fc5\u987b\u5b9e\u73b0\u6b64\u63a5\u53e3 \r\n * \r\n * @author zhy \r\n * \r\n *\/ \r\npublic interface Subject \r\n{ \r\n  \/** \r\n   * \u6ce8\u518c\u4e00\u4e2a\u89c2\u5bdf\u7740 \r\n   * \r\n   * @param observer \r\n   *\/ \r\n  public void registerObserver(Observer observer); \r\n \r\n  \/** \r\n   * \u79fb\u9664\u4e00\u4e2a\u89c2\u5bdf\u8005 \r\n   * \r\n   * @param observer \r\n   *\/ \r\n  public void removeObserver(Observer observer); \r\n \r\n  \/** \r\n   * \u901a\u77e5\u6240\u6709\u7684\u89c2\u5bdf\u7740 \r\n   *\/ \r\n  public void notifyObservers(); \r\n \r\n} \r\npackage com.zhy.pattern.observer; \r\n \r\n\/** \r\n * @author zhy \u6240\u6709\u7684\u89c2\u5bdf\u8005\u9700\u8981\u5b9e\u73b0\u6b64\u63a5\u53e3 \r\n *\/ \r\npublic interface Observer \r\n{ \r\n  public void update(String msg); \r\n \r\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u63a5\u4e0b\u67653D\u670d\u52a1\u53f7\u7684\u5b9e\u73b0\u7c7b\uff1a<\/p>\n
package com.zhy.pattern.observer; \r\n \r\nimport java.util.ArrayList; \r\nimport java.util.List; \r\n \r\npublic class ObjectFor3D implements Subject \r\n{ \r\n  private List<Observer> observers = new ArrayList<Observer>(); \r\n  \/** \r\n   * 3D\u5f69\u7968\u7684\u53f7\u7801 \r\n   *\/ \r\n  private String msg; \r\n \r\n  @Override \r\n  public void registerObserver(Observer observer) \r\n  { \r\n    observers.add(observer); \r\n  } \r\n \r\n  @Override \r\n  public void removeObserver(Observer observer) \r\n  { \r\n    int index = observers.indexOf(observer); \r\n    if (index >= 0) \r\n    { \r\n      observers.remove(index); \r\n    } \r\n  } \r\n \r\n  @Override \r\n  public void notifyObservers() \r\n  { \r\n    for (Observer observer : observers) \r\n    { \r\n      observer.update(msg); \r\n    } \r\n  } \r\n \r\n  \/** \r\n   * \u4e3b\u9898\u66f4\u65b0\u6d88\u606f \r\n   * \r\n   * @param msg \r\n   *\/ \r\n  public void setMsg(String msg) \r\n  { \r\n    this.msg = msg; \r\n     \r\n    notifyObservers(); \r\n  } \r\n \r\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u6a21\u62df\u4e24\u4e2a\u4f7f\u7528\u8005\uff1a<\/p>\n
package com.zhy.pattern.observer; \r\n \r\npublic class Observer1 implements Observer \r\n{ \r\n \r\n  private Subject subject; \r\n \r\n  public Observer1(Subject subject) \r\n  { \r\n    this.subject = subject; \r\n    subject.registerObserver(this); \r\n  } \r\n \r\n  @Override \r\n  public void update(String msg) \r\n  { \r\n    System.out.println(\"observer1 \u5f97\u5230 3D \u53f7\u7801 -->\" + msg + \", \u6211\u8981\u8bb0\u4e0b\u6765\u3002\"); \r\n  } \r\n \r\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
package com.zhy.pattern.observer; \r\n \r\npublic class Observer2 implements Observer \r\n{ \r\n  private Subject subject ;  \r\n   \r\n  public Observer2(Subject subject) \r\n  { \r\n    this.subject = subject ; \r\n    subject.registerObserver(this); \r\n  } \r\n   \r\n  @Override \r\n  public void update(String msg) \r\n  { \r\n    System.out.println(\"observer2 \u5f97\u5230 3D \u53f7\u7801 -->\" + msg + \"\u6211\u8981\u544a\u8bc9\u820d\u53cb\u4eec\u3002\"); \r\n  } \r\n   \r\n   \r\n \r\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u53ef\u4ee5\u770b\u51fa\uff1a\u670d\u52a1\u53f7\u4e2d\u7ef4\u62a4\u4e86\u6240\u6709\u5411\u5b83\u8ba2\u9605\u6d88\u606f\u7684\u4f7f\u7528\u8005\uff0c\u5f53\u670d\u52a1\u53f7\u6709\u65b0\u6d88\u606f\u65f6\uff0c\u901a\u77e5\u6240\u6709\u7684\u4f7f\u7528\u8005\u3002\u6574\u4e2a\u662f\u4e00\u79cd\u677e\u8026\u5408\uff0c\u4e3b\u9898\u7684\u5b9e\u73b0\u4e0d\u4f9d\u8d56\u4e0e\u4f7f\u7528\u8005\uff0c\u5f53\u589e\u52a0\u65b0\u7684\u4f7f\u7528\u8005\u65f6\uff0c\u4e3b\u9898\u7684\u4ee3\u7801\u4e0d\u9700\u8981\u6539\u53d8\uff1b\u4f7f\u7528\u8005\u5982\u4f55\u5904\u7406\u5f97\u5230\u7684\u6570\u636e\u4e0e\u4e3b\u9898\u65e0\u5173\uff1b
\u6700\u540e\u770b\u4e0b\u6d4b\u8bd5\u4ee3\u7801\uff1a<\/p>\n
package com.zhy.pattern.observer.test; \r\n \r\nimport com.zhy.pattern.observer.ObjectFor3D; \r\nimport com.zhy.pattern.observer.Observer; \r\nimport com.zhy.pattern.observer.Observer1; \r\nimport com.zhy.pattern.observer.Observer2; \r\nimport com.zhy.pattern.observer.Subject; \r\n \r\npublic class Test \r\n{ \r\n  public static void main(String[] args) \r\n  { \r\n    \/\/\u6a21\u62df\u4e00\u4e2a3D\u7684\u670d\u52a1\u53f7 \r\n    ObjectFor3D subjectFor3d = new ObjectFor3D(); \r\n    \/\/\u5ba2\u62371 \r\n    Observer observer1 = new Observer1(subjectFor3d); \r\n    Observer observer2 = new Observer2(subjectFor3d); \r\n \r\n    subjectFor3d.setMsg(\"20140420\u76843D\u53f7\u7801\u662f\uff1a127\" ); \r\n    subjectFor3d.setMsg(\"20140421\u76843D\u53f7\u7801\u662f\uff1a333\" ); \r\n     \r\n  } \r\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n
observer1 \u5f97\u5230 3D \u53f7\u7801 -->20140420\u76843D\u53f7\u7801\u662f\uff1a127, \u6211\u8981\u8bb0\u4e0b\u6765\u3002 \r\nobserver2 \u5f97\u5230 3D \u53f7\u7801 -->20140420\u76843D\u53f7\u7801\u662f\uff1a127\u6211\u8981\u544a\u8bc9\u820d\u53cb\u4eec\u3002 \r\nobserver1 \u5f97\u5230 3D \u53f7\u7801 -->20140421\u76843D\u53f7\u7801\u662f\uff1a333, \u6211\u8981\u8bb0\u4e0b\u6765\u3002 \r\nobserver2 \u5f97\u5230 3D \u53f7\u7801 -->20140421\u76843D\u53f7\u7801\u662f\uff1a333\u6211\u8981\u544a\u8bc9\u820d\u53cb\u4eec\u3002<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u5bf9\u4e8eJDK\u6216\u8005Andorid\u4e2d\u90fd\u6709\u5f88\u591a\u5730\u65b9\u5b9e\u73b0\u4e86\u89c2\u5bdf\u8005\u6a21\u5f0f\uff0c\u6bd4\u5982XXXView.addXXXListenter \uff0c \u5f53\u7136\u4e86 XXXView.setOnXXXListener\u4e0d\u4e00\u5b9a\u662f\u89c2\u5bdf\u8005\u6a21\u5f0f\uff0c\u56e0\u4e3a\u89c2\u5bdf\u8005\u6a21\u5f0f\u662f\u4e00\u79cd\u4e00\u5bf9\u591a\u7684\u5173\u7cfb\uff0c\u5bf9\u4e8esetXXXListener\u662f1\u5bf91\u7684\u5173\u7cfb\uff0c\u5e94\u8be5\u53eb\u56de\u8c03\u3002<\/p>\n
\u606d\u559c\u4f60\u5b66\u4f1a\u4e86\u89c2\u5bdf\u8005\u6a21\u5f0f\uff0c\u4e0a\u9762\u7684\u89c2\u5bdf\u8005\u6a21\u5f0f\u4f7f\u6211\u4eec\u4ece\u65e0\u5230\u6709\u7684\u5199\u51fa\uff0c\u5f53\u7136\u4e86java\u4e2d\u5df2\u7ecf\u5e2e\u6211\u4eec\u5b9e\u73b0\u4e86\u89c2\u5bdf\u8005\u6a21\u5f0f\uff0c\u501f\u52a9\u4e8ejava.util.Observable\u548cjava.util.Observer\u3002
\u4e0b\u9762\u6211\u4eec\u4f7f\u7528Java\u5185\u7f6e\u7684\u7c7b\u5b9e\u73b0\u89c2\u5bdf\u8005\u6a21\u5f0f\uff1a<\/p>\n
\u9996\u5148\u662f\u4e00\u4e2a3D\u5f69\u7968\u670d\u52a1\u53f7\u4e3b\u9898\uff1a<\/p>\n
package com.zhy.pattern.observer.java; \r\n \r\nimport java.util.Observable; \r\n \r\npublic class SubjectFor3d extends Observable \r\n{ \r\n  private String msg ;  \r\n   \r\n   \r\n  public String getMsg() \r\n  { \r\n    return msg; \r\n  } \r\n \r\n \r\n  \/** \r\n   * \u4e3b\u9898\u66f4\u65b0\u6d88\u606f \r\n   * \r\n   * @param msg \r\n   *\/ \r\n  public void setMsg(String msg) \r\n  { \r\n    this.msg = msg ; \r\n    setChanged(); \r\n    notifyObservers(); \r\n  } \r\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u4e0b\u9762\u662f\u4e00\u4e2a\u53cc\u8272\u7403\u7684\u670d\u52a1\u53f7\u4e3b\u9898\uff1a<\/p>\n
package com.zhy.pattern.observer.java; \r\n \r\nimport java.util.Observable; \r\n \r\npublic class SubjectForSSQ extends Observable \r\n{ \r\n  private String msg ;  \r\n   \r\n   \r\n  public String getMsg() \r\n  { \r\n    return msg; \r\n  } \r\n \r\n \r\n  \/** \r\n   * \u4e3b\u9898\u66f4\u65b0\u6d88\u606f \r\n   * \r\n   * @param msg \r\n   *\/ \r\n  public void setMsg(String msg) \r\n  { \r\n    this.msg = msg ; \r\n    setChanged(); \r\n    notifyObservers(); \r\n  } \r\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u6700\u540e\u662f\u6211\u4eec\u7684\u4f7f\u7528\u8005\uff1a<\/p>\n
package com.zhy.pattern.observer.java; \r\n \r\nimport java.util.Observable; \r\nimport java.util.Observer; \r\n \r\npublic class Observer1 implements Observer \r\n{ \r\n \r\n  public void registerSubject(Observable observable) \r\n  { \r\n    observable.addObserver(this); \r\n  } \r\n \r\n  @Override \r\n  public void update(Observable o, Object arg) \r\n  { \r\n    if (o instanceof SubjectFor3d) \r\n    { \r\n      SubjectFor3d subjectFor3d = (SubjectFor3d) o; \r\n      System.out.println(\"subjectFor3d's msg -- >\" + subjectFor3d.getMsg()); \r\n    } \r\n \r\n    if (o instanceof SubjectForSSQ) \r\n    { \r\n      SubjectForSSQ subjectForSSQ = (SubjectForSSQ) o; \r\n      System.out.println(\"subjectForSSQ's msg -- >\" + subjectForSSQ.getMsg()); \r\n    } \r\n  } \r\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u770b\u4e00\u4e2a\u6d4b\u8bd5\u4ee3\u7801\uff1a<\/p>\n
package com.zhy.pattern.observer.java; \r\n \r\npublic class Test \r\n{ \r\n  public static void main(String[] args) \r\n  { \r\n    SubjectFor3d subjectFor3d = new SubjectFor3d() ; \r\n    SubjectForSSQ subjectForSSQ = new SubjectForSSQ() ; \r\n     \r\n    Observer1 observer1 = new Observer1(); \r\n    observer1.registerSubject(subjectFor3d); \r\n    observer1.registerSubject(subjectForSSQ); \r\n     \r\n     \r\n    subjectFor3d.setMsg(\"hello 3d'nums : 110 \"); \r\n    subjectForSSQ.setMsg(\"ssq'nums : 12,13,31,5,4,3 15\"); \r\n     \r\n  } \r\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u6d4b\u8bd5\u7ed3\u679c\uff1a<\/p>\n
subjectFor3d's msg -- >hello 3d'nums : 110  \r\nsubjectForSSQ's msg -- >ssq'nums : 12,13,31,5,4,3 15<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u53ef\u4ee5\u770b\u51fa\uff0c\u4f7f\u7528Java\u5185\u7f6e\u7684\u7c7b\u5b9e\u73b0\u89c2\u5bdf\u8005\u6a21\u5f0f\uff0c\u4ee3\u7801\u975e\u5e38\u7b80\u6d01\uff0c\u5bf9\u4e86addObserver,removeObserver,notifyObservers\u90fd\u5df2\u7ecf\u4e3a\u6211\u4eec\u5b9e\u73b0\u4e86\uff0c\u6240\u6709\u53ef\u4ee5\u770b\u51faObservable\uff08\u4e3b\u9898\uff09\u662f\u4e00\u4e2a\u7c7b\uff0c\u800c\u4e0d\u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u57fa\u672c\u4e0a\u4e66\u4e0a\u90fd\u5bf9\u4e8eJava\u7684\u5982\u6b64\u8bbe\u8ba1\u62b1\u6709\u53cd\u9762\u7684\u6001\u5ea6\uff0c\u89c9\u5f97Java\u5185\u7f6e\u7684\u89c2\u5bdf\u8005\u6a21\u5f0f\uff0c\u8fdd\u6cd5\u4e86\u9762\u5411\u63a5\u53e3\u8fd9\u4e2a\u539f\u5219\uff0c\u4f46\u662f\u5982\u679c\u8f6c\u5ff5\u60f3\u4e00\u60f3\uff0c\u7684\u786e\u4f60\u62ff\u4e00\u4e2a\u4e3b\u9898\u5728\u8fd9\u5199\u89c2\u5bdf\u8005\u6a21\u5f0f\uff08\u6211\u4eec\u81ea\u5df1\u7684\u5b9e\u73b0\uff09\uff0c\u63a5\u53e3\u7684\u601d\u60f3\u5f88\u597d\uff0c\u4f46\u662f\u5982\u679c\u73b0\u5728\u7ee7\u7eed\u6dfb\u52a0\u5f88\u591a\u4e2a\u4e3b\u9898\uff0c\u6bcf\u4e2a\u4e3b\u9898\u7684ddObserver,removeObserver,notifyObservers\u4ee3\u7801\u57fa\u672c\u90fd\u662f\u76f8\u540c\u7684\u5427\uff0c\u63a5\u53e3\u662f\u65e0\u6cd5\u5b9e\u73b0\u4ee3\u7801\u590d\u7528\u7684\uff0c\u800c\u4e14\u4e5f\u6ca1\u6709\u529e\u6cd5\u4f7f\u7528\u7ec4\u5408\u7684\u6a21\u5f0f\u5b9e\u73b0\u8fd9\u4e09\u4e2a\u65b9\u6cd5\u7684\u590d\u7528\uff0c\u6240\u4ee5\u6211\u89c9\u5f97\u8fd9\u91cc\u628a\u8fd9\u4e09\u4e2a\u65b9\u6cd5\u5728\u7c7b\u4e2d\u5b9e\u73b0\u662f\u5408\u7406\u7684\u3002<\/p>\n
\u4ee5\u4e0a\u5c31\u662f\u7528Java\u8bbe\u8ba1\u6a21\u5f0f\u4e2d\u7684\u89c2\u5bdf\u8005\u6a21\u5f0f\u5f00\u53d1\u5fae\u4fe1\u516c\u4f17\u53f7\u7684\u5b9e\u4f8b\u4ee3\u7801\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
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\/** * \u4e3b\u9898\u63a5\u53e3\uff0c\u6240\u6709\u7684\u4e3b\u9898\u5fc5\u987b\u5b9e\u73b0\u6b64\u63a5\u53e3 * * @author zhy * *\/ public interface Subject { \/** * \u6ce8\u518c\u4e00\u4e2a\u89c2\u5bdf\u7740 * * @param observer *\/ public void registerObserver(Observer observer); \/** * \u79fb\u9664\u4e00\u4e2a\u89c2\u5bdf\u8005 * * @param observer *\/ public void removeObserver(Observer observer); \/** * \u901a\u77e5\u6240\u6709\u7684\u89c2\u5bdf\u7740 *\/ public void notifyObservers(); } package com.zhy.pattern.observer; […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"class_list":["post-29505","post","type-post","status-publish","format-standard","hentry","category-19"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/29505","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=29505"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/29505\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=29505"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=29505"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=29505"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}