{"id":89201,"date":"2026-08-02T16:02:04","date_gmt":"2026-08-02T08:02:04","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/89201.html"},"modified":"2026-08-02T16:02:04","modified_gmt":"2026-08-02T08:02:04","slug":"set%e9%9b%86%e5%90%88%e8%af%ad%e6%b3%95%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/89201.html","title":{"rendered":"Set\u96c6\u5408\u8bed\u6cd5\u8be6\u89e3"},"content":{"rendered":"<h2>Set\u96c6\u5408\u8bed\u6cd5\u8be6\u89e3<\/h2>\n<h2>\u4e00\u3001Set\u7cfb\u5217\u96c6\u5408<\/h2>\n<ul>\n<li>\u65e0\u5e8f : \u5b58\u53d6\u987a\u5e8f\u4e0d\u4e00\u81f4<\/li>\n<li>\u4e0d\u91cd\u590d : \u53ef\u4ee5\u53bb\u9664\u91cd\u590d<\/li>\n<li>\u65e0\u7d22\u5f15 : \u6ca1\u6709\u5e26\u7d22\u5f15\u7684\u65b9\u6cd5,\u6240\u4ee5\u4e0d\u80fd\u4f7f\u7528\u666e\u901afor\u5faa\u73af\u904d\u5386,\u4e5f\u4e0d\u80fd\u901a\u8fc7\u7d22\u5f15\u6765\u83b7\u53d6\u5143\u7d20<\/li>\n<\/ul>\n<h2>\u4e8c\u3001Set\u96c6\u5408\u7684\u5b9e\u73b0\u7c7b<\/h2>\n<ul>\n<li>HashSet : \u65e0\u5e8f\u3001\u4e0d\u91cd\u590d\u3001\u65e0\u7d22\u5f15<\/li>\n<li>LinkedHashSet : \u6709\u5e8f\u3001\u4e0d\u91cd\u590d\u3001\u65e0\u7d22\u5f15<\/li>\n<li>TreeSet : \u53ef\u6392\u5e8f\u3001\u4e0d\u91cd\u590d\u3001\u65e0\u9501\u5f15<\/li>\n<\/ul>\n<p>\u270f\ufe0f \u6ce8\u610f<br \/>\nSet\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5\u4e0a\u57fa\u672c\u4e0eCollection\u7684API\u4e00\u81f4<\/p>\n<p>collection\u662f\u5355\u5217\u96c6\u5408\u7684\u7956\u5b97\u63a5\u53e3,\u5b83\u7684\u529f\u80fd\u662f\u5168\u90e8\u5355\u5217\u96c6\u5408\u90fd\u53ef\u4ee5\u7ee7\u627f\u4f7f\u7528\u7684<\/p>\n<table>\n<tr>\u65b9\u6cd5\u540d\u79f0\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>public boolean add(E e)<\/td>\n<td>\u628a\u7ed9\u5b9a\u5bf9\u8c61\u6dfb\u52a0\u5230\u5f53\u524d\u96c6\u5408\u4e2d<\/td>\n<\/tr>\n<tr>\n<td>public void clear( )<\/td>\n<td>\u6e05\u7a7a\u96c6\u5408\u4e2d\u7684\u6240\u6709\u5143\u7d20<\/td>\n<\/tr>\n<tr>\n<td>public boolean remove(E e) <\/td>\n<td>\u628a\u7ed9\u5b9a\u7684\u5bf9\u8c61\u5728\u5f53\u524d\u96c6\u5408\u4e2d\u5220\u9664<\/td>\n<\/tr>\n<tr>\n<td>public boolean contains(Object obj)<\/td>\n<td>\u5224\u65ad\u5f53\u524d\u96c6\u5408\u4e2d\u662f\u5426\u5305\u542b\u7ed9\u5b9a\u7684\u5bf9\u8c61,\u5e95\u5c42\u662f\u901a\u8fc7equals\u5b9e\u73b0\u7684,\u5982\u679c\u5b58\u81ea\u5b9a\u4e49\u5bf9\u8c61,\u6ca1\u6709\u91cd\u5199equals\u65b9\u6cd5,\u90a3\u4e48\u9ed8\u8ba4\u4f7f\u7528Object\u7c7b\u4e2d\u7684equals\u65b9\u6cd5\u8fdb\u884c\u5224\u65ad,\u4f9d\u8d56\u5730\u5740\u503c\u8fdb\u884c\u5224\u65ad<\/td>\n<\/tr>\n<tr>\n<td>public boolean isEmpty( )<\/td>\n<td>\u5224\u65ad\u5f53\u524d\u96c6\u5408\u662f\u5426\u4e3a\u7a7a<\/td>\n<\/tr>\n<tr>\n<td>public int size( )<\/td>\n<td>\u8fd4\u56de\u96c6\u5408\u4e2d\u5143\u7d20\u7684\u4e2a\u6570\/\u96c6\u5408\u7684\u957f\u5ea6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u26a0\ufe0f Set\u7684\u904d\u5386<br \/>\n1.\u589e\u5f3afor<\/p>\n<p>2.\u8fed\u4ee3\u5668<\/p>\n<p>3.Lambda\u8868\u8fbe\u5f0f<\/p>\n<p><span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> set <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashSet<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        set<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u751c\u751c&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        set<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6e90\u6e90&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        set<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u540d\u4fa6\u63a2\u67ef\u5357&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        set<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u602a\u76d7\u57fa\u5fb7&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 1.\u589e\u5f3afor<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> s <span class=\"token operator\">:<\/span> set<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 2.\u8fed\u4ee3\u5668<\/span><br \/>\n        <span class=\"token class-name\">Iterator<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> iterator <span class=\"token operator\">&#061;<\/span> set<span class=\"token punctuation\">.<\/span><span class=\"token function\">iterator<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span>iterator<span class=\"token punctuation\">.<\/span><span class=\"token function\">hasNext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">String<\/span> s <span class=\"token operator\">&#061;<\/span> iterator<span class=\"token punctuation\">.<\/span><span class=\"token function\">next<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 3.Lambda\u8868\u8fbe\u5f0f<\/span><br \/>\n        set<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Consumer<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n            <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> s<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        set<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span>s <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u200d<\/p>\n<h4>1. HashSet<\/h4>\n<h5>1.1 Hash\u8868<\/h5>\n<ul>\n<li>HashSet\u96c6\u5408\u5e95\u5c42\u91c7\u53d6\u54c8\u5e0c\u8868\u5b58\u50a8\u6570\u636e<\/li>\n<li>\u54c8\u5e0c\u8868\u662f\u4e00\u79cd\u5bf9\u4e8e\u589e\u5220\u6539\u67e5\u6570\u636e\u6027\u80fd\u90fd\u8f83\u597d\u7684\u7ed3\u6784<\/li>\n<\/ul>\n<p>&#x1f4a1; \u54c8\u5e0c\u8868\u7684\u7ec4\u6210<br \/>\nJDK8\u4e4b\u524d : \u6570\u7ec4 &#043; \u94fe\u8868<\/p>\n<p>JDK8\u5f00\u59cb : \u6570\u7ec4 &#043; \u94fe\u8868 &#043; \u7ea2\u9ed1\u6811<\/p>\n<p>int index &#061; (\u6570\u7ec4\u957f\u5ea6 &#8211; 1) &amp; \u54c8\u5e0c\u503c \u2014&gt;\u8ba1\u7b97\u4f4d\u7f6e<\/p>\n<p>\u54c8\u5e0c\u503c :<\/p>\n<ul>\n<li>\u6839\u636ehashCode\u65b9\u6cd5\u8ba1\u7b97\u51fa\u6765\u7684int\u7c7b\u578b\u7684\u6574\u6570<\/li>\n<li>\u8be5\u65b9\u6cd5\u5b9a\u4e49\u5728Object\u7c7b\u4e2d,\u6240\u6709\u5bf9\u8c61\u90fd\u53ef\u4ee5\u8c03\u7528,\u9ed8\u8ba4\u4f7f\u7528\u5730\u5740\u503c\u8fdb\u884c\u8ba1\u7b97<\/li>\n<li>\u4e00\u822c\u60c5\u51b5\u4e0b,\u4f1a\u91cd\u5199hashCode\u65b9\u6cd5,\u5229\u7528\u5bf9\u8c61\u5185\u90e8\u7684\u5c5e\u6027\u503c\u8ba1\u7b97\u54c8\u5e0c\u503c<\/li>\n<\/ul>\n<p>\u5bf9\u8c61\u7684\u54c8\u5e0c\u503c\u7279\u70b9:<\/p>\n<ul>\n<li>\u5982\u679c\u6ca1\u6709\u91cd\u5199hashCode\u65b9\u6cd5,\u4e0d\u540c\u5bf9\u8c61\u8ba1\u7b97\u51fa\u6765\u7684\u54c8\u5e0c\u503c\u662f\u4e0d\u540c\u7684<\/li>\n<li>\u5982\u679c\u5df2\u7ecf\u91cd\u5199hashCode\u65b9\u6cd5,\u4e0d\u540c\u7684\u5bf9\u8c61\u53ea\u8981\u5c5e\u6027\u503c\u76f8\u540c,\u8ba1\u7b97\u51fa\u7684\u54c8\u5e0c\u503c\u5c31\u662f\u4e00\u6837\u7684<\/li>\n<li>\u5728\u5c0f\u90e8\u5206\u60c5\u51b5\u4e0b,\u4e0d\u540c\u7684\u5c5e\u6027\u503c\u6216\u8005\u4e0d\u540c\u7684\u5730\u5740\u503c\u8ba1\u7b97\u51fa\u6765\u7684\u54c8\u5e0c\u503c\u4e5f\u6709\u53ef\u80fd\u4e00\u6837(\u54c8\u5e0c\u78b0\u649e)<\/li>\n<\/ul>\n<h6>1.1.1 HashCode\u7684\u4ee3\u7801\u6f14\u793a<\/h6>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Student<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Integer<\/span> age<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span> age<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>age <span class=\"token operator\">&#061;<\/span> age<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Object<\/span> o<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>o <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span> <span class=\"token operator\">||<\/span> <span class=\"token function\">getClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> o<span class=\"token punctuation\">.<\/span><span class=\"token function\">getClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Student<\/span> student <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">)<\/span> o<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Objects<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">,<\/span> student<span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token class-name\">Objects<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>age<span class=\"token punctuation\">,<\/span> student<span class=\"token punctuation\">.<\/span>age<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Objects<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">hash<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">,<\/span> age<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token class-name\">Student<\/span> s1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u751c\u751c&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">18<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Student<\/span> s2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u751c\u751c&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">18<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>s1<span class=\"token punctuation\">.<\/span><span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/29741139<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>s2<span class=\"token punctuation\">.<\/span><span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/29741139<\/span><\/p>\n<p><span class=\"token comment\">\/\/\u54c8\u5e0c\u78b0\u649e,\u5c0f\u6982\u7387\u4e8b\u4ef6<\/span><br \/>\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;abc&#034;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/96354<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;acD&#034;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/96354<\/span><\/p>\n<p>\u200d<\/p>\n<h5>1.2 HashSet \u5e95\u5c42\u539f\u7406  (hashSet.html  \u539f\u7406\u6f14\u793a\u7f51\u9875,\u70b9\u51fb\u5b66\u4e60\u5427!)<\/h5>\n<li>\u521b\u5efa\u4e00\u4e2a\u9ed8\u8ba4\u957f\u5ea6\u4e3a16,\u9ed8\u8ba4\u52a0\u8f7d\u56e0\u5b50\u4e3a0.75,\u6570\u7ec4\u540d\u4e3atable<\/li>\n<li>\u6839\u636e\u5143\u7d20\u7684\u54c8\u5e0c\u503c\u8ddf\u6570\u7ec4\u7684\u957f\u5ea6\u8ba1\u7b97\u51fa\u5e94\u5b58\u5165\u7684\u4f4d\u7f6e<\/li>\n<li>\u5224\u65ad\u5f53\u524d\u4f4d\u7f6e\u662f\u5426\u4e3anull,\u5982\u679c\u4e3anull\u76f4\u63a5\u5b58\u5165<\/li>\n<li>\u5982\u679c\u4f4d\u7f6e\u4e0d\u4e3anull,\u8868\u793a\u6709\u5143\u7d20,\u5219\u8c03\u7528equals\u65b9\u6cd5\u4f9d\u6b21\u6bd4\u8f83\u5c5e\u6027\u503c<\/li>\n<li>\n<ul>\n<li>\n<p>\u4e00\u6837 : \u4e0d\u5b58(\u91cd\u590d\u5143\u7d20)<\/p>\n<\/li>\n<li>\n<p>\u4e0d\u4e00\u6837 : \u5b58\u5165\u6570\u7ec4,\u5f62\u6210\u94fe\u8868<\/p>\n<p>JDK8\u4ee5\u524d : \u65b0\u5143\u7d20\u5b58\u5165\u6570\u7ec4,\u8001\u5143\u7d20\u6302\u5728\u65b0\u5143\u7d20\u4e0b\u9762<\/p>\n<p>JDK8\u4ee5\u540e : \u65b0\u5143\u7d20\u76f4\u63a5\u6302\u5728\u8001\u5143\u7d20\u4e0b\u9762,\u5f53\u94fe\u8868\u957f\u5ea6\u8d85\u8fc78,\u800c\u4e14\u6570\u7ec4\u957f\u5ea6\u5927\u4e8e\u7b49\u4e8e64\u65f6,\u81ea\u52a8\u8f6c\u6362\u4e3a\u7ea2\u9ed1\u6811<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<p>\u26a0\ufe0f \u6ce8\u610f<br \/>\n\u5982\u679c\u96c6\u5408\u4e2d\u5b58\u50a8\u7684\u662f\u81ea\u5b9a\u4e49\u5bf9\u8c61,\u5fc5\u987b\u8981\u91cd\u5199hashCode\u548cequals\u65b9\u6cd5<\/p>\n<p>\u9664\u81ea\u5b9a\u4e49\u5bf9\u8c61\u5916,Java\u5e95\u5c42\u5df2\u7ecf\u5b9e\u73b0\u4e86 String Integer<\/p>\n<p>\u904d\u5386\u65f6\u6309\u7167hash\u6570\u7ec4\u4ece0\u7d22\u5f15\u5f00\u59cb\u904d\u5386,\u6709\u94fe\u8868\u5c31\u628a\u94fe\u8868\u904d\u5386\u5b8c,\u518d\u904d\u5386\u4e0b\u4e00\u4e2a\u7d22\u5f15,\u5faa\u73af\u5f80\u590d<\/p>\n<h5>1.3 LinkedHashSet\u5e95\u5c42\u539f\u7406(LinkedHashSet.html  \u539f\u7406\u6f14\u793a\u7f51\u9875,\u70b9\u51fb\u5b66\u4e60\u5427!)<\/h5>\n<ul>\n<li>\u6709\u5e8f\u3001\u4e0d\u91cd\u590d\u3001\u65e0\u7d22\u5f15<\/li>\n<li>\u8fd9\u91cc\u7684\u6709\u5e8f\u6307\u7684\u662f\u4fdd\u8bc1\u5b58\u50a8\u548c\u53d6\u51fa\u7684\u5143\u7d20\u987a\u5e8f\u4e00\u81f4<\/li>\n<li>\u539f\u7406 : \u5e95\u5c42\u6570\u636e\u7ed3\u6784\u4f9d\u7136\u662f\u54c8\u5e0c\u8868,\u53ea\u662f\u6bcf\u4e2a\u5143\u7d20\u53c8\u989d\u5916\u7684\u591a\u4e86\u4e00\u4e2a\u53cc\u94fe\u8868\u7684\u673a\u5236\u8bb0\u5f55\u5b58\u50a8\u7684\u987a\u5e8f<\/li>\n<\/ul>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>        <span class=\"token class-name\">Student<\/span> s1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u751c\u751c&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">18<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Student<\/span> s2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u67ef\u5357&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">19<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Student<\/span> s3 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6e90\u6e90&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">18<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Student<\/span> s4 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7070\u539f\u54c0&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">18<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Student<\/span> s5 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5143\u592a&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">18<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Student<\/span> s6 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u751c\u751c&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">18<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">LinkedHashSet<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> lhs <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LinkedHashSet<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>lhs<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>s1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/ture<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>lhs<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>s2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/ture<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>lhs<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>s3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/ture<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>lhs<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>s4<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/ture<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>lhs<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>s5<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/ture<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>lhs<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>s6<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/false<\/span><\/p>\n<p>        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>lhs<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/[Student{name&#061;&#039;\u751c\u751c&#039;, age&#061;18}, Student{name&#061;&#039;\u67ef\u5357&#039;, age&#061;19}, Student{name&#061;&#039;\u6e90\u6e90&#039;, age&#061;18}, Student{name&#061;&#039;\u7070\u539f\u54c0&#039;, age&#061;18}, Student{name&#061;&#039;\u5143\u592a&#039;, age&#061;18}]<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u200d<\/p>\n<h5>1.4 TreeSet<\/h5>\n<h6>1.4.1 TreeSet\u7684\u7279\u70b9 :<\/h6>\n<ul>\n<li>\u4e0d\u91cd\u590d\u3001\u65e0\u7d22\u5f15\u3001\u53ef\u6392\u5e8f<\/li>\n<li>\u53ef\u6392\u5e8f : \u6309\u7167\u5143\u7d20\u7684\u9ed8\u8ba4\u89c4\u5219(\u7531\u5927\u5230\u5c0f)\u6392\u5e8f<\/li>\n<li>TreeSet\u96c6\u5408\u5e95\u5c42\u662f\u57fa\u4e8e\u7ea2\u9ed1\u6811\u7684\u6570\u636e\u7ed3\u6784\u5b9e\u73b0\u6392\u5e8f\u7684,\u589e\u5220\u6539\u67e5\u6027\u80fd\u90fd\u8f83\u597d<\/li>\n<\/ul>\n<p>&#x1f4a1; TreeSet\u96c6\u5408\u9ed8\u8ba4\u7684\u89c4\u5219<\/p>\n<ul>\n<li>\u5bf9\u4e8e\u6570\u503c\u7c7b\u578b : Integer\u3001Double,\u9ed8\u8ba4\u6309\u7167\u4ece\u5c0f\u5230\u5927\u7684\u987a\u5e8f\u8fdb\u884c\u6392\u5e8f<\/li>\n<li>\u5bf9\u4e8e\u5b57\u7b26\u3001\u5b57\u7b26\u4e32\u7c7b\u578b : \u6309\u7167\u5b57\u7b26\u5728ASCII\u8868\u4e2d\u7684\u6570\u5b57\u5347\u5e8f\u8fdb\u884c\u6392\u5e8f<\/li>\n<\/ul>\n<p>\u200d<\/p>\n<h6>1.4.2 \u7b2c\u4e00\u79cd\u6392\u5e8f\u89c4\u5219(\u9ed8\u8ba4\u6392\u5e8f\/\u81ea\u7136\u6392\u5e8f : Javabean\u7c7b\u5b9e\u73b0Comparable\u63a5\u53e3\u6307\u5b9a\u6bd4\u8f83\u89c4\u5219)<\/h6>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Student<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Comparable<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">compareTo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Student<\/span> o<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/\u6307\u5b9a\u6392\u5e8f\u7684\u89c4\u5219<\/span><br \/>\n<span class=\"token comment\">\/\/\u53ea\u770b\u5e74\u9f84,\u6211\u60f3\u8981\u6309\u7167\u5e74\u9f84\u7684\u5347\u5e8f\u8fdb\u884c\u6392\u5217<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getAge<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> o<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAge<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>&#x1f4a1; \u63d0\u793a<br \/>\nthis : \u8868\u793a\u5f53\u524d\u8981\u6dfb\u52a0\u7684\u5143\u7d20<\/p>\n<p>o : \u8868\u793a\u5df2\u7ecf\u5728\u7ea2\u9ed1\u6811\u5b58\u5728\u7684\u5143\u7d20<\/p>\n<p>\u8fd4\u56de\u503c :<\/p>\n<ul>\n<li>\u8d1f\u6570 : \u8ba4\u4e3a\u8981\u6dfb\u52a0\u7684\u5143\u7d20\u662f\u5c0f\u7684,\u5b58\u5728\u5de6\u8fb9<\/li>\n<li>\u6574\u6570 : \u8ba4\u4e3a\u8981\u6dfb\u52a0\u7684\u5143\u7d20\u662f\u5927\u7684,\u5b58\u5728\u53f3\u8fb9<\/li>\n<li>0 : \u8ba4\u4e3a\u8981\u6dfb\u52a0\u7684\u5143\u7d20\u5df2\u7ecf\u5b58\u5728,\u820d\u5f03<\/li>\n<\/ul>\n<h6>1.4.3 \u7b2c\u4e8c\u79cd\u6392\u5e8f\u89c4\u5219(\u6bd4\u8f83\u5668\u6392\u5e8f : \u521b\u5efaTreeSet\u5bf9\u8c61\u7684\u65f6\u5019,\u4f20\u9012\u6bd4\u8f83\u5668Comparator\u6307\u5b9a\u89c4\u5219)<\/h6>\n<p>\u4f7f\u7528\u89c4\u5219 : \u9ed8\u8ba4\u4f7f\u7528\u7b2c\u4e00\u79cd,\u5982\u679c\u7b2c\u4e00\u79cd\u4e0d\u80fd\u6ee1\u8db3\u5f53\u524d\u9700\u6c42,\u5c31\u4f7f\u7528\u7b2c\u4e8c\u79cd<\/p>\n<ul>\n<li class=\"task-list-item\"> \u5b58\u5165\u56db\u4e2a\u5b57\u7b26\u4e32, \u201cc\u201d , \u201cab\u201d , \u201cdf\u201d , \u201cqwer\u201d ,\u6309\u7167\u957f\u5ea6\u6392\u5e8f,\u5982\u679c\u4e00\u6837\u5219\u6309\u7167\u9996\u5b57\u6bcd\u6392\u5e8f<\/li>\n<\/ul>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">TreeSet<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> ts <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">TreeSet<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Comparator<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n            <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">compare<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> o1<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> o2<span 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