{"rsdb":{"rid":"395125","subhead":"","postdate":"0","aid":"272505","fid":"54","uid":"1","topic":"1","content":"<p>\u5b9a\u4e49\uff1aEnsure a class has only one instance, and provide a global point of access to it.\uff08\u786e\u4fdd\u67d0\u4e00\u4e2a\u7c7b\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u800c\u4e14\u81ea\u884c\u5b9e\u4f8b\u5316\u5e76\u5411\u6574\u4e2a\u7cfb\u7edf\u63d0\u4f9b\u8fd9\u4e2a\u5b9e\u4f8b\u3002\uff09<\/p><br\/><p>1.\u997f\u6c49\u5f0f<\/p><br\/><p>\u6b64\u79cd\u65b9\u5f0f\u5728\u5de5\u4f5c\u4e2d\u6700\u4e3a\u7b80\u5355\u5e38\u7528\u3002\u7c7b\u52a0\u8f7d\u5230\u5185\u5b58\u540e\uff0c\u5c31\u53ea\u88ab\u5b9e\u4f8b\u5316\u4e00\u6b21\uff0c\u6240\u4ee5\u53ea\u4f1a\u4ea7\u751f\u4e00\u4e2a\u5b9e\u4f8b\uff0cJVM\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u3002\u552f\u4e00\u7684\u7f3a\u70b9\u662f\u4e0d\u7ba1\u7528\u5230\u4e0e\u5426\uff0c\u90fd\u4f1a\u5728\u7c7b\u52a0\u8f7d\u7684\u65f6\u5019\u5b8c\u6210\u5b9e\u4f8b\u5316\u3002<\/p><br\/><p>2.\u61d2\u6c49\u5f0f<\/p><br\/><p>\u6b64\u79cd\u65b9\u5f0f\u867d\u7136\u8fbe\u5230\u4e86\u6309\u9700\u521d\u59cb\u5316\u7684\u76ee\u7684\uff0c\u4f46\u662f\u5e26\u6765\u4e86\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\u95ee\u9898\uff0c\u6240\u4ee5\u901a\u8fc7\u52a0\u9501\u7684\u65b9\u5f0f\u89e3\u51b3\uff0c\u4f46\u662f\u53c8\u5e26\u6765\u6548\u7387\u4e0b\u964d\u7684\u95ee\u9898\uff0c\u53e6\u5916\u53d8\u91cf\u9700\u8981\u6dfb\u52a0volatile\u5173\u952e\u5b57\uff0c\u9632\u6b62\u6307\u4ee4\u91cd\u6392\u5e8f\u3002<\/p><br\/><p>3.\u9759\u6001\u5185\u90e8\u7c7b<\/p><br\/><p>\u6b64\u79cd\u65b9\u5f0f\u89e3\u51b3\u4e86\u4e0a\u9762\u4e24\u79cd\u65b9\u5f0f\u7684\u95ee\u9898\uff0c\u5f53SingletonInner\u7c7b\u88ab\u52a0\u8f7d\u7684\u65f6\u5019\uff0cSingletonInnerHolder\u5185\u90e8\u7c7b\u662f\u4e0d\u4f1a\u88ab\u52a0\u8f7d\u7684\uff0c\u53ea\u6709\u5728\u8c03\u7528getInstance()\u7684\u65f6\u5019\u624d\u4f1a\u88ab\u52a0\u8f7d,\u65e2\u8fbe\u5230\u4e86\u61d2\u52a0\u8f7d\uff0c\u53c8\u4fdd\u8bc1\u4e86\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b\u3002<\/p><br\/><p>4.\u679a\u4e3e\u65b9\u5f0f<\/p><br\/><p>\u6b64\u79cd\u65b9\u5f0f\u4e0d\u4ec5\u53ef\u4ee5\u89e3\u51b3\u7ebf\u7a0b\u540c\u6b65\u95ee\u9898\uff0c\u8fd8\u53ef\u4ee5\u9632\u6b62\u53cd\u5e8f\u5217\u5316\uff0c\u56e0\u4e3a\u679a\u4e3e\u7c7b\u6ca1\u6709\u6784\u9020\u65b9\u6cd5\u3002<\/p><br\/><p>&nbsp;<\/p><br\/>","orderid":"0","title":"\u8bbe\u8ba1\u6a21\u5f0f\u4e4b\u5355\u4f8b\u6a21\u5f0f\u7406\u89e3","smalltitle":"","mid":"0","fname":"linux\u7f16\u7a0b\u57fa\u7840","special_id":"0","bak_id":"0","info":"0","hits":"581","pages":"1","comments":"0","posttime":"2023-07-26 08:18:31","list":"1690330711","username":"admin","author":"","copyfrom":"","copyfromurl":"","titlecolor":"","fonttype":"0","titleicon":"0","picurl":"https:\/\/www.cppentry.com\/upload_files\/","ispic":"0","yz":"1","yzer":"","yztime":"0","levels":"0","levelstime":"0","keywords":"<A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%BC%C6%C4%A3%CA%BD' target=_blank>\u8ba1\u6a21\u5f0f<\/A> <A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%B5%A5%C0%FD%C4%A3' target=_blank>\u5355\u4f8b\u6a21<\/A>","jumpurl":"","iframeurl":"","style":"","template":"a:3:{s:4:\"head\";s:0:\"\";s:4:\"foot\";s:0:\"\";s:8:\"bencandy\";s:0:\"\";}","target":"0","ip":"119.59.235.169","lastfid":"0","money":"0","buyuser":"","passwd":"","allowdown":"","allowview":"","editer":"","edittime":"0","begintime":"0","endtime":"0","description":"\u8bbe\u8ba1\u6a21\u5f0f\u4e4b\u5355\u4f8b\u6a21\u5f0f\u7406\u89e3","lastview":"1714284694","digg_num":"1085","digg_time":"1714200417","forbidcomment":"0","ifvote":"0","heart":"","htmlname":"","city_id":"0"},"page":"1"}