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\n\u89c2\u5bdf\u8005\u6a21\u5f0f\u5b9a\u4e49\u4e86\u4e00\u79cd\u4e00\u5bf9\u591a\u7684\u4f9d\u8d56\u5173\u7cfb\uff0c\u8ba9\u591a\u4e2a\u89c2\u5bdf\u8005\u5bf9\u8c61\u540c\u65f6\u76d1\u542c\u67d0\u4e00\u4e2a\u4e3b\u9898\u5bf9\u8c61\u3002\u8fd9\u4e2a\u4e3b\u9898\u5bf9\u8c61\u5728\u72b6\u6001\u4e0a\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u4f1a\u901a\u77e5\u6240\u6709\u89c2\u5bdf\u8005\u5bf9\u8c61\uff0c\u4f7f\u5b83\u4eec\u80fd\u591f\u81ea\u52a8\u66f4\u65b0\u81ea\u5df1\u3002
\n\u89c2\u5bdf\u8005\u6a21\u5f0f\u5c31\u5982\u4e00\u4e2a\u804a\u5929\u5ba4\uff0c\u5f53\u4f60\u9700\u8981\u6536\u5230\u804a\u5929\u5ba4\u7684\u6d88\u606f\u65f6\uff0c\u4f60\u5c31\u6ce8\u518c\u6210\u4e3a\u804a\u5929\u5ba4\u7684\u6210\u5458\uff0c\u5f53\u804a\u5929\u5ba4\u6709\u4fe1\u606f\u66f4\u65b0\u65f6\uff0c\u5c31\u4f1a\u4f20\u5230\u4f60\u90a3\u53bb\u3002\u5f53\u4f60\u4e0d\u9700\u8981\u63a5\u6536\u804a\u5929\u5ba4\u7684\u4fe1\u606f\u65f6,\u53ef\u4ee5\u6ce8\u9500\u6389,\u9000\u51fa\u804a\u5929\u5ba4\u3002
\n\u53c8\u4f8b\u5982\uff0c\u5929\u6c14\u89c2\u6d4b\u7ad9\u548c\u6c14\u8c61\u62a5\u544a\u677f\u7684\u5173\u7cfb\u3002\u4f46\u62a5\u544a\u677f\u60f3\u83b7\u53d6\u89c2\u6d4b\u7ad9\u7684\u6570\u636e,\u53ef\u4ee5\u6ce8\u518c\u52a0\u5165\u5230\u89c2\u6d4b\u7ad9\u7684\u89c2\u5bdf\u8005\u5217\u8868\u4e2d\uff0c\u8fd9\u5c31\u53ef\u4ee5\u4f7f\u89c2\u6d4b\u7ad9\u6709\u6570\u636e\u66f4\u65b0\u65f6\uff0c\u81ea\u52a8\u4f20\u7ed9\u6c14\u8c61\u62a5\u544a\u677f\u3002
\n\u4e0b\u9762\u4ee5\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u610f\u6027\u5b9e\u73b0\u4e3a\u4f8b,\u8ba8\u8bba\u89c2\u5bdf\u8005\u6a21\u5f0f\u7684\u7ed3\u6784\u3002<\/p>\n
\u89c2\u5bdf\u8005\u6a21\u5f0f\u6240\u6d89\u53ca\u7684\u89d2\u8272\u6709:
\n1\u3001\u62bd\u8c61\u4e3b\u9898(Subject)\u89d2\u8272:
\n\u62bd\u8c61\u4e3b\u9898\u89d2\u8272\u628a\u6240\u6709\u5bf9\u89c2\u5bdf\u8005\u5bf9\u8c61\u7684\u5f15\u7528\u4fdd\u5b58\u5728\u4e00\u4e2a\u805a\u96c6(\u6bd4\u5982ArrayList\u5bf9\u8c61)\u91cc\uff0c\u6bcf\u4e2a\u4e3b\u9898\u90fd\u53ef\u4ee5\u6709\u4efb\u4f55\u6570\u91cf\u7684\u89c2\u5bdf\u8005\u3002\u62bd\u8c61\u4e3b\u9898\u63d0\u4f9b\u4e00\u4e2a\u63a5\u53e3,\u53ef\u4ee5\u589e\u52a0\u548c\u5220\u9664\u89c2\u5bdf\u8005\u5bf9\u8c61\uff0c\u62bd\u8c61\u4e3b\u9898\u89d2\u8272\u53c8\u53eb\u505a\u62bd\u8c61\u88ab\u89c2\u5bdf\u8005(Observable)\u89d2\u8272\u3002
\n2\u3001\u5177\u4f53\u4e3b\u9898(ConcreteSubject)\u89d2\u8272:
\n\u5c06\u6709\u5173\u72b6\u6001\u5b58\u5165\u5177\u4f53\u89c2\u5bdf\u8005\u5bf9\u8c61;\u5728\u5177\u4f53\u4e3b\u9898\u7684\u5185\u90e8\u72b6\u6001\u6539\u53d8\u65f6,\u7ed9\u6240\u6709\u767b\u8bb0\u8fc7\u7684\u89c2\u5bdf\u8005\u53d1\u51fa\u901a\u77e5\u3002\u5177\u4f53\u4e3b\u9898\u89d2\u8272\u53c8\u53eb\u505a\u5177\u4f53\u88ab\u89c2\u5bdf\u8005(ConcreteObservable)\u89d2\u8272\u3002
\n3\u3001\u62bd\u8c61\u89c2\u5bdf\u8005(Observer)\u89d2\u8272:
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\n4\u3001\u5177\u4f53\u89c2\u5bdf\u8005(ConcreteObserver)\u89d2\u8272:
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