{"rsdb":{"rid":"372605","subhead":"","postdate":"0","aid":"261539","fid":"76","uid":"1","topic":"1","content":"
\n
\n

\u672c\u4eba\u514d\u8d39\u6574\u7406\u4e86Java\u9ad8\u7ea7\u8d44\u6599\uff0c\u6db5\u76d6\u4e86Java\u3001Redis\u3001MongoDB\u3001MySQL\u3001Zookeeper\u3001Spring Cloud\u3001Dubbo\u9ad8\u5e76\u53d1\u5206\u5e03\u5f0f\u7b49\u6559\u7a0b\uff0c\u4e00\u517130G\uff0c\u9700\u8981\u81ea\u5df1\u9886\u53d6\u3002<\/span>
\u4f20\u9001\u95e8<\/span>\uff1ahttps:\/\/mp.weixin.qq.com\/s\/JzddfH-7yNudmkjT0IRL8Q<\/a><\/h3> \n <\/blockquote> \n

\u4e00\uff0cSet<\/h2> \n

Set:\u6ce8\u91cd\u72ec\u4e00\u65e0\u4e8c\u7684\u6027\u8d28,\u8be5\u4f53\u7cfb\u96c6\u5408\u53ef\u4ee5\u77e5\u9053\u67d0\u7269\u662f\u5426\u5df2\u8fd1\u5b58\u5728\u4e8e\u96c6\u5408\u4e2d,\u4e0d\u4f1a\u5b58\u50a8\u91cd\u590d\u7684\u5143\u7d20<\/p> \n

\u7528\u4e8e\u5b58\u50a8\u65e0\u5e8f(\u5b58\u5165\u548c\u53d6\u51fa\u7684\u987a\u5e8f\u4e0d\u4e00\u5b9a\u76f8\u540c)\u5143\u7d20\uff0c\u503c\u4e0d\u80fd\u91cd\u590d\u3002<\/p> \n

\u5bf9\u8c61\u7684\u76f8\u7b49\u6027<\/p> \n

\u5f15\u7528\u5230\u5806\u4e0a\u540c\u4e00\u4e2a\u5bf9\u8c61\u7684\u4e24\u4e2a\u5f15\u7528\u662f\u76f8\u7b49\u7684\u3002\u5982\u679c\u5bf9\u4e24\u4e2a\u5f15\u7528\u8c03\u7528hashCode\u65b9\u6cd5\uff0c\u4f1a\u5f97\u5230\u76f8\u540c\u7684\u7ed3\u679c\uff0c\u5982\u679c\u5bf9\u8c61\u6240\u5c5e\u7684\u7c7b\u6ca1\u6709\u8986\u76d6Object\u7684hashCode\u65b9\u6cd5\u7684\u8bdd\uff0chashCode\u4f1a\u8fd4\u56de\u6bcf\u4e2a\u5bf9\u8c61\u7279\u6709\u7684\u5e8f\u53f7\uff08java<\/a>\u662f\u4f9d\u636e\u5bf9\u8c61\u7684\u5185\u5b58\u5730\u5740\u8ba1\u7b97\u51fa\u7684\u6b64\u5e8f\u53f7\uff09\uff0c\u6240\u4ee5\u4e24\u4e2a\u4e0d\u540c\u7684\u5bf9\u8c61\u7684hashCode\u503c\u662f\u4e0d\u53ef\u80fd\u76f8\u7b49\u7684\u3002<\/p> \n

\u5982\u679c\u60f3\u8981\u8ba9\u4e24\u4e2a\u4e0d\u540c\u7684Person\u5bf9\u8c61\u89c6\u4e3a\u76f8\u7b49\u7684\uff0c\u5c31\u5fc5\u987b\u8986\u76d6Object\u7ee7\u4e0b\u6765\u7684hashCode\u65b9\u6cd5\u548cequals\u65b9\u6cd5\uff0c\u56e0\u4e3aObject hashCode\u65b9\u6cd5\u8fd4\u56de\u7684\u662f\u8be5\u5bf9\u8c61\u7684\u5185\u5b58\u5730\u5740\uff0c\u6240\u4ee5\u5fc5\u987b\u91cd\u5199hashCode\u65b9\u6cd5\uff0c\u624d\u80fd\u4fdd\u8bc1\u4e24\u4e2a\u4e0d\u540c\u7684\u5bf9\u8c61\u5177\u6709\u76f8\u540c\u7684hashCode\uff0c\u540c\u65f6\u4e5f\u9700\u8981\u4e24\u4e2a\u4e0d\u540c\u5bf9\u8c61\u6bd4\u8f83equals\u65b9\u6cd5\u4f1a\u8fd4\u56detrue<\/p> \n

\u8be5\u96c6\u5408\u4e2d\u6ca1\u6709\u7279\u6709\u7684\u65b9\u6cd5\uff0c\u76f4\u63a5\u7ee7\u627f\u81eaCollection\u3002<\/p> \n

\n
\n 
---| Itreable      \u63a5\u53e3 \u5b9e\u73b0\u8be5\u63a5\u53e3\u53ef\u4ee5\u4f7f\u7528\u589e\u5f3afor\u5faa\u73af\r\n                <\/span>---| Collection        \u63cf\u8ff0\u6240\u6709\u96c6\u5408\u5171\u6027\u7684\u63a5\u53e3\r\n                    <\/span>---| List\u63a5\u53e3        \u53ef\u4ee5\u6709\u91cd\u590d\u5143\u7d20\u7684\u96c6\u5408\r\n                            <\/span>---| ArrayList   \r\n                            <\/span>---|  LinkedList\r\n                    <\/span>---| Set\u63a5\u53e3        \u4e0d\u53ef\u4ee5\u6709\u91cd\u590d\u5143\u7d20\u7684\u96c6\u5408\r\n <\/span><\/pre> \n  <\/div> \n  
 <\/p> \n <\/div> \n 
\u6848\u4f8b\uff1aset\u96c6\u5408\u6dfb\u52a0\u5143\u7d20\u5e76\u4f7f\u7528\u8fed\u4ee3\u5668\u8fed\u4ee3\u5143\u7d20\u3002<\/p> \n 
 \n  
 \n   
public<\/span> class<\/span> Demo4 {\r\n    <\/span>public<\/span> static<\/span> void<\/span> main(String[] args) {\r\n        <\/span>\/\/<\/span>Set \u96c6\u5408\u5b58\u548c\u53d6\u7684\u987a\u5e8f\u4e0d\u4e00\u81f4\u3002<\/span>\r\n        Set hs = new<\/span> HashSet();\r\n        hs.add(<\/span>"\u4e16\u754c\u519b\u4e8b");\r\n        hs.add(<\/span>"\u5175\u5668\u77e5\u8bc6");\r\n        hs.add(<\/span>"\u8230\u8239\u77e5\u8bc6");\r\n        hs.add(<\/span>"\u6c49\u548c\u9632\u52a1");\r\n        System.out.println(hs);\r\n        <\/span>\/\/<\/span> [\u8230\u8239\u77e5\u8bc6, \u4e16\u754c\u519b\u4e8b, \u5175\u5668\u77e5\u8bc6, \u6c49\u548c\u9632\u52a1]<\/span>\r\n        Iterator it = hs.iterator();\r\n        <\/span>while<\/span> (it.hasNext()) {\r\n            System.out.println(it.next());\r\n        }\r\n    }\r\n}<\/span><\/pre> \n  <\/div> \n  
 <\/p> \n <\/div> \n 
 <\/p> \n 
\u4e8c\uff0cHashSet<\/h2> \n 
 \n  
 \n   
---| Itreable      \u63a5\u53e3 \u5b9e\u73b0\u8be5\u63a5\u53e3\u53ef\u4ee5\u4f7f\u7528\u589e\u5f3afor\u5faa\u73af\r\n                <\/span>---| Collection        \u63cf\u8ff0\u6240\u6709\u96c6\u5408\u5171\u6027\u7684\u63a5\u53e3\r\n                    <\/span>---| List\u63a5\u53e3        \u53ef\u4ee5\u6709\u91cd\u590d\u5143\u7d20\u7684\u96c6\u5408\r\n                            <\/span>---| ArrayList   \r\n                            <\/span>---|  LinkedList\r\n                    <\/span>---| Set\u63a5\u53e3        \u4e0d\u53ef\u4ee5\u6709\u91cd\u590d\u5143\u7d20\u7684\u96c6\u5408\r\n                            <\/span>---| HashSet  \u7ebf\u7a0b\u4e0d\u5b89\u5168\uff0c\u5b58\u53d6\u901f\u5ea6\u5feb\u3002\u5e95\u5c42\u662f\u4ee5\u54c8\u5e0c\u8868\u5b9e\u73b0\u7684\u3002<\/pre> \n  <\/div> \n  
 <\/p> \n  
HashSet<\/pre> \n <\/div> \n 
\u54c8\u5e0c\u8868\u8fb9\u5b58\u653e\u7684\u662f\u54c8\u5e0c\u503c\u3002HashSet\u5b58\u50a8\u5143\u7d20\u7684\u987a\u5e8f\u5e76\u4e0d\u662f\u6309\u7167\u5b58\u5165\u65f6\u7684\u987a\u5e8f\uff08\u548cList\u663e\u7136\u4e0d\u540c\uff09 \u662f\u6309\u7167\u54c8\u5e0c\u503c\u6765\u5b58\u7684\u6240\u4ee5\u53d6\u6570\u636e\u4e5f\u662f\u6309\u7167\u54c8\u5e0c\u503c\u53d6\u5f97\u3002<\/p> \n 
HashSet\u4e0d\u5b58\u5165\u91cd\u590d\u5143\u7d20\u7684\u89c4\u5219.\u4f7f\u7528hashcode\u548cequals<\/p> \n 
\u7531\u4e8eSet\u96c6\u5408\u662f\u4e0d\u80fd\u5b58\u5165\u91cd\u590d\u5143\u7d20\u7684\u96c6\u5408\u3002\u90a3\u4e48HashSet\u4e5f\u662f\u5177\u5907\u8fd9\u4e00\u7279\u6027\u7684\u3002HashSet\u5982\u4f55\u68c0\u67e5\u91cd\u590d\uff1fHashSet\u4f1a\u901a\u8fc7\u5143\u7d20\u7684hashcode\uff08\uff09\u548cequals\u65b9\u6cd5\u8fdb\u884c\u5224\u65ad\u5143\u7d20\u5e08\u5426\u91cd\u590d\u3002<\/p> \n 
\u5f53\u4f60\u8bd5\u56fe\u628a\u5bf9\u8c61\u52a0\u5165HashSet\u65f6\uff0cHashSet\u4f1a\u4f7f\u7528\u5bf9\u8c61\u7684hashCode\u6765\u5224\u65ad\u5bf9\u8c61\u52a0\u5165\u7684\u4f4d\u7f6e\u3002\u540c\u65f6\u4e5f\u4f1a\u4e0e\u5176\u4ed6\u5df2\u7ecf\u52a0\u5165\u7684\u5bf9\u8c61\u7684hashCode\u8fdb\u884c\u6bd4\u8f83\uff0c\u5982\u679c\u6ca1\u6709\u76f8\u7b49\u7684hashCode\uff0cHashSet\u5c31\u4f1a\u5047\u8bbe\u5bf9\u8c61\u6ca1\u6709\u91cd\u590d\u51fa\u73b0\u3002<\/p> \n 
\u7b80\u5355\u4e00\u53e5\u8bdd\uff0c\u5982\u679c\u5bf9\u8c61\u7684hashCode\u503c\u662f\u4e0d\u540c\u7684\uff0c\u90a3\u4e48HashSet\u4f1a\u8ba4\u4e3a\u5bf9\u8c61\u662f\u4e0d\u53ef\u80fd\u76f8\u7b49\u7684\u3002<\/p> \n 
\u56e0\u6b64\u6211\u4eec\u81ea\u5b9a\u4e49\u7c7b\u7684\u65f6\u5019\u9700\u8981\u91cd\u5199hashCode\uff0c\u6765\u786e\u4fdd\u5bf9\u8c61\u5177\u6709\u76f8\u540c\u7684hashCode\u503c\u3002<\/p> \n 
\u5982\u679c\u5143\u7d20(\u5bf9\u8c61)\u7684hashCode\u503c\u76f8\u540c,\u662f\u4e0d\u662f\u5c31\u65e0\u6cd5\u5b58\u5165HashSet\u4e2d\u4e86? \u5f53\u7136\u4e0d\u662f,\u4f1a\u7ee7\u7eed\u4f7f\u7528equals \u8fdb\u884c\u6bd4\u8f83.\u5982\u679c equals\u4e3atrue \u90a3\u4e48HashSet\u8ba4\u4e3a\u65b0\u52a0\u5165\u7684\u5bf9\u8c61\u91cd\u590d\u4e86,\u6240\u4ee5\u52a0\u5165\u5931\u8d25\u3002\u5982\u679cequals \u4e3afalse\u90a3\u4e48HashSet \u8ba4\u4e3a\u65b0\u52a0\u5165\u7684\u5bf9\u8c61\u6ca1\u6709\u91cd\u590d.\u65b0\u5143\u7d20\u53ef\u4ee5\u5b58\u5165.<\/p> \n 
 <\/h2> \n 
\u603b\u7ed3\uff1a<\/h2> \n 
\u5143\u7d20\u7684\u54c8\u5e0c\u503c\u662f\u901a\u8fc7\u5143\u7d20\u7684hashcode\u65b9\u6cd5 \u6765\u83b7\u53d6\u7684, HashSet\u9996\u5148\u5224\u65ad\u4e24\u4e2a\u5143\u7d20\u7684\u54c8\u5e0c\u503c\uff0c\u5982\u679c\u54c8\u5e0c\u503c\u4e00\u6837\uff0c\u63a5\u7740\u4f1a\u6bd4\u8f83equals\u65b9\u6cd5 \u5982\u679c equls\u7ed3\u679c\u4e3atrue \uff0cHashSet\u5c31\u89c6\u4e3a\u540c\u4e00\u4e2a\u5143\u7d20\u3002\u5982\u679cequals \u4e3afalse\u5c31\u4e0d\u662f\u540c\u4e00\u4e2a\u5143\u7d20\u3002<\/p> \n 
\u54c8\u5e0c\u503c\u76f8\u540cequals\u4e3afalse\u7684\u5143\u7d20\u662f\u600e\u4e48\u5b58\u50a8\u5462,\u5c31\u662f\u5728\u540c\u6837\u7684\u54c8\u5e0c\u503c\u4e0b\u987a\u5ef6\uff08\u53ef\u4ee5\u8ba4\u4e3a\u54c8\u5e0c\u503c\u76f8\u540c\u7684\u5143\u7d20\u653e\u5728\u4e00\u4e2a\u54c8\u5e0c\u6876\u4e2d\uff09\u3002\u4e5f\u5c31\u662f\u54c8\u5e0c\u4e00\u6837\u7684\u5b58\u4e00\u5217\u3002<\/p> \n 
hashtable<\/h2> \n 
\"\"<\/p> \n 
\u56fe1\uff1ahashCode\u503c\u4e0d\u76f8\u540c\u7684\u60c5\u51b5<\/p> \n 
\u56fe2\uff1ahashCode\u503c\u76f8\u540c\uff0c\u4f46equals\u4e0d\u76f8\u540c\u7684\u60c5\u51b5\u3002<\/p> \n 
HashSet\uff1a\u901a\u8fc7hashCode\u503c\u6765\u786e\u5b9a\u5143\u7d20\u5728\u5185\u5b58\u4e2d\u7684\u4f4d\u7f6e\u3002\u4e00\u4e2ahashCode\u4f4d\u7f6e\u4e0a\u53ef\u4ee5\u5b58\u653e\u591a\u4e2a\u5143\u7d20\u3002<\/p> \n 
\u5f53hashcode() \u503c\u76f8\u540cequals() \u8fd4\u56de\u4e3atrue \u65f6,hashset \u96c6\u5408\u8ba4\u4e3a\u8fd9\u4e24\u4e2a\u5143\u7d20\u662f\u76f8\u540c\u7684\u5143\u7d20.\u53ea\u5b58\u50a8\u4e00\u4e2a\uff08\u91cd\u590d\u5143\u7d20\u65e0\u6cd5\u653e\u5165\uff09\u3002\u8c03\u7528\u539f\u7406:\u5148\u5224\u65adhashcode \u65b9\u6cd5\u7684\u503c,\u5982\u679c\u76f8\u540c\u624d\u4f1a\u53bb\u5224\u65adequals \u5982\u679c\u4e0d\u76f8\u540c,\u662f\u4e0d\u4f1a\u8c03\u7528equals\u65b9\u6cd5\u7684\u3002<\/p> \n 
HashSet\u5230\u5e95\u662f\u5982\u4f55\u5224\u65ad\u4e24\u4e2a\u5143\u7d20\u91cd\u590d\u3002<\/p> \n 
\u901a\u8fc7hashCode\u65b9\u6cd5\u548cequals\u65b9\u6cd5\u6765\u4fdd\u8bc1\u5143\u7d20\u7684\u552f\u4e00\u6027\uff0cadd()\u8fd4\u56de\u7684\u662fboolean\u7c7b\u578b<\/p> \n 
\u5224\u65ad\u4e24\u4e2a\u5143\u7d20\u662f\u5426\u76f8\u540c\uff0c\u5148\u8981\u5224\u65ad\u5143\u7d20\u7684hashCode\u503c\u662f\u5426\u4e00\u81f4\uff0c\u53ea\u6709\u5728\u8be5\u503c\u4e00\u81f4\u7684\u60c5\u51b5\u4e0b\uff0c\u624d\u4f1a\u5224\u65adequals\u65b9\u6cd5\uff0c\u5982\u679c\u5b58\u50a8\u5728HashSet\u4e2d\u7684\u4e24\u4e2a\u5bf9\u8c61hashCode\u65b9\u6cd5\u7684\u503c\u76f8\u540cequals\u65b9\u6cd5\u8fd4\u56de\u7684\u7ed3\u679c\u662ftrue\uff0c\u90a3\u4e48HashSet\u8ba4\u4e3a\u8fd9\u4e24\u4e2a\u5143\u7d20\u662f\u76f8\u540c\u5143\u7d20\uff0c\u53ea\u5b58\u50a8\u4e00\u4e2a\uff08\u91cd\u590d\u5143\u7d20\u65e0\u6cd5\u5b58\u5165\uff09\u3002<\/p> \n 
\u6ce8\u610f\uff1aHashSet\u96c6\u5408\u5728\u5224\u65ad\u5143\u7d20\u662f\u5426\u76f8\u540c\u5148\u5224\u65adhashCode\u65b9\u6cd5\uff0c\u5982\u679c\u76f8\u540c\u624d\u4f1a\u5224\u65adequals\u3002\u5982\u679c\u4e0d\u76f8\u540c\uff0c\u662f\u4e0d\u4f1a\u8c03\u7528equals\u65b9\u6cd5\u7684\u3002<\/p> \n 
HashSet \u548cArrayList\u96c6\u5408\u90fd\u6709\u5224\u65ad\u5143\u7d20\u662f\u5426\u76f8\u540c\u7684\u65b9\u6cd5\uff0c<\/p> \n 
boolean contains(Object o)<\/p> \n 
HashSet\u4f7f\u7528hashCode\u548cequals\u65b9\u6cd5\uff0cArrayList\u4f7f\u7528\u4e86equals\u65b9\u6cd5<\/p> \n 
 <\/p> \n 
\u6848\u4f8b\uff1a<\/h2> \n 
\u4f7f\u7528HashSet\u5b58\u50a8\u5b57\u7b26\u4e32\uff0c\u5e76\u5c1d\u8bd5\u6dfb\u52a0\u91cd\u590d\u5b57\u7b26\u4e32<\/p> \n 
\u56de\u987eString\u7c7b\u7684equals()\u3001hashCode()\u4e24\u4e2a\u65b9\u6cd5\u3002<\/p> \n 
 \n  
 \n   
public<\/span> class<\/span> Demo4 {\r\n    <\/span>public<\/span> static<\/span> void<\/span> main(String[] args) {\r\n        <\/span>\/\/<\/span> Set \u96c6\u5408\u5b58\u548c\u53d6\u7684\u987a\u5e8f\u4e0d\u4e00\u81f4\u3002<\/span>\r\n        Set hs = new<\/span> HashSet();\r\n        hs.add(<\/span>"\u4e16\u754c\u519b\u4e8b");\r\n        hs.add(<\/span>"\u5175\u5668\u77e5\u8bc6");\r\n        hs.add(<\/span>"\u8230\u8239\u77e5\u8bc6");\r\n        hs.add(<\/span>"\u6c49\u548c\u9632\u52a1");\r","orderid":"0","title":"Java\u5185\u529f\u5fc3\u6cd5\uff0cSet\u96c6\u5408\u7684\u8be6\u89e3(\u4e00)","smalltitle":"","mid":"0","fname":"JAVA","special_id":"0","bak_id":"0","info":"0","hits":"75","pages":"4","comments":"0","posttime":"2019-09-19 11:11:57","list":"1568862717","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":"Java<\/A> \u5185\u529f<\/A> \u5fc3\u6cd5<\/A> Set<\/A> \u96c6\u5408<\/A> \u8be6\u89e3<\/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":"14.17.22.32","lastfid":"0","money":"0","buyuser":"","passwd":"","allowdown":"","allowview":"","editer":"","edittime":"0","begintime":"0","endtime":"0","description":"Java\u5185\u529f\u5fc3\u6cd5\uff0cSet\u96c6\u5408\u7684\u8be6\u89e3","lastview":"1711634873","digg_num":"0","digg_time":"0","forbidcomment":"0","ifvote":"0","heart":"","htmlname":"","city_id":"0"},"page":"1"}