{"id":2950,"date":"2016-12-14T12:34:32","date_gmt":"2016-12-14T04:34:32","guid":{"rendered":"http:\/\/www.menglanglang.cn\/?p=2950"},"modified":"2016-12-14T12:34:32","modified_gmt":"2016-12-14T04:34:32","slug":"java%e9%81%8d%e5%8e%86hashset%e4%b8%ba%e4%bb%80%e4%b9%88%e8%be%93%e5%87%ba%e6%98%af%e6%9c%89%e5%ba%8f%e7%9a%84","status":"publish","type":"post","link":"http:\/\/www.menglanglang.cn\/?p=2950","title":{"rendered":"Java\u904d\u5386HashSet\u4e3a\u4ec0\u4e48\u8f93\u51fa\u662f\u6709\u5e8f\u7684"},"content":{"rendered":"<p>\u4eca\u5929\u8fd0\u884c\u300a\u75af\u72c2Java\u8bb2\u4e49\u300b\u4e2d 8.2 \u4e2d\u7684 IteratorTest.java \u65f6\uff0c\u4e0d\u7ba1\u8fd0\u884c\u591a\u5c11\u6b21\uff0c\u7ed3\u679c\u8f93\u51fa\u90fd\u662f\u4e00\u81f4\u7684\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<div class=\"dp-highlighter\">\n<div class=\"bar\">\n<div class=\"tools\"><b style=\"color: #000;\">Code<\/b>\u00a0\u00a0\u00a0<a href=\"#\">View<\/a><a href=\"#\">Print<\/a><\/div>\n<\/div>\n<ol class=\"dp-j\" start=\"1\">\n<li class=\"alt\"><span class=\"keyword\">package<\/span>\u00a0com.menglanglang.java.collection;<\/li>\n<li class=\"\"><\/li>\n<li class=\"alt\"><span class=\"keyword\">import<\/span>\u00a0java.util.*;<\/li>\n<li class=\"\"><span class=\"comment\">\/**<\/span><\/li>\n<li class=\"alt\"><span class=\"comment\">\u00a0*\u00a0Description:<\/span><\/li>\n<li class=\"\"><span class=\"comment\">\u00a0*\u00a0&lt;br\/&gt;\u7f51\u7ad9:\u00a0&lt;a\u00a0href=&#8221;http:\/\/www.crazyit.org&#8221;&gt;\u75af\u72c2Java\u8054\u76df&lt;\/a&gt;<\/span><\/li>\n<li class=\"alt\"><span class=\"comment\">\u00a0*\u00a0&lt;br\/&gt;Copyright\u00a0(C),\u00a02001-2016,\u00a0Yeeku.H.Lee<\/span><\/li>\n<li class=\"\"><span class=\"comment\">\u00a0*\u00a0&lt;br\/&gt;This\u00a0program\u00a0is\u00a0protected\u00a0by\u00a0copyright\u00a0laws.<\/span><\/li>\n<li class=\"alt\"><span class=\"comment\">\u00a0*\u00a0&lt;br\/&gt;Program\u00a0Name:<\/span><\/li>\n<li class=\"\"><span class=\"comment\">\u00a0*\u00a0&lt;br\/&gt;Date:<\/span><\/li>\n<li class=\"alt\"><span class=\"comment\">\u00a0*\u00a0@author\u00a0Yeeku.H.Lee\u00a0kongyeeku@163.com<\/span><\/li>\n<li class=\"\"><span class=\"comment\">\u00a0*\u00a0@version\u00a01.0<\/span><\/li>\n<li class=\"alt\"><span class=\"comment\">\u00a0*\/<\/span><\/li>\n<li class=\"\"><span class=\"keyword\">public<\/span>\u00a0<span class=\"keyword\">class<\/span>\u00a0IteratorTest<\/li>\n<li class=\"alt\">{<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0<span class=\"keyword\">public<\/span>\u00a0<span class=\"keyword\">static<\/span>\u00a0<span class=\"keyword\">void<\/span>\u00a0main(String[]\u00a0args)<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0{<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"comment\">\/\/\u00a0\u521b\u5efa\u96c6\u5408\u3001\u6dfb\u52a0\u5143\u7d20\u7684\u4ee3\u7801\u4e0e\u524d\u4e00\u4e2a\u7a0b\u5e8f\u76f8\u540c<\/span><\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Collection\u00a0books\u00a0=\u00a0<span class=\"keyword\">new<\/span>\u00a0HashSet();<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0books.add(<span class=\"string\">&#8220;\u75af\u72c2Java\u8bb2\u4e49&#8221;<\/span>);<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0books.add(<span class=\"string\">&#8220;\u8f7b\u91cf\u7ea7Java\u00a0EE\u4f01\u4e1a\u5e94\u7528\u5b9e\u6218&#8221;<\/span>);<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0books.add(<span class=\"string\">&#8220;\u75af\u72c2Android\u8bb2\u4e49&#8221;<\/span>);<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"comment\">\/\/\u00a0\u83b7\u53d6books\u96c6\u5408\u5bf9\u5e94\u7684\u8fed\u4ee3\u5668<\/span><\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Iterator\u00a0it\u00a0=\u00a0books.iterator();<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"keyword\">while<\/span>(it.hasNext())<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"comment\">\/\/\u00a0it.next()\u65b9\u6cd5\u8fd4\u56de\u7684\u6570\u636e\u7c7b\u578b\u662fObject\u7c7b\u578b\uff0c\u56e0\u6b64\u9700\u8981\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362<\/span><\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0String\u00a0book\u00a0=\u00a0(String)it.next();<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0System.out.println(book);<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"keyword\">if<\/span>\u00a0(book.equals(<span class=\"string\">&#8220;\u75af\u72c2Java\u8bb2\u4e49&#8221;<\/span>))<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"comment\">\/\/\u00a0\u4ece\u96c6\u5408\u4e2d\u5220\u9664\u4e0a\u4e00\u6b21next\u65b9\u6cd5\u8fd4\u56de\u7684\u5143\u7d20<\/span><\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0it.remove();<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"comment\">\/\/\u00a0\u5bf9book\u53d8\u91cf\u8d4b\u503c\uff0c\u4e0d\u4f1a\u6539\u53d8\u96c6\u5408\u5143\u7d20\u672c\u8eab<\/span><\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0book\u00a0=\u00a0<span class=\"string\">&#8220;\u6d4b\u8bd5\u5b57\u7b26\u4e32&#8221;<\/span>;\u00a0\u00a0\u00a0<span class=\"comment\">\/\/\u2460<\/span><\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0System.out.println(books);<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0}<\/li>\n<li class=\"\">}<\/li>\n<li class=\"alt\"><span class=\"comment\">\/\/\u00a0\u8f93\u51fa\uff1a<\/span><\/li>\n<li class=\"\"><span class=\"comment\">\/\/\u00a0\u75af\u72c2Android\u8bb2\u4e49<\/span><\/li>\n<li class=\"alt\"><span class=\"comment\">\/\/\u00a0\u8f7b\u91cf\u7ea7Java\u00a0EE\u4f01\u4e1a\u5e94\u7528\u5b9e\u6218<\/span><\/li>\n<li class=\"\"><span class=\"comment\">\/\/\u00a0\u75af\u72c2Java\u8bb2\u4e49<\/span><\/li>\n<li class=\"alt\"><span class=\"comment\">\/\/\u00a0[\u75af\u72c2Android\u8bb2\u4e49,\u00a0\u8f7b\u91cf\u7ea7Java\u00a0EE\u4f01\u4e1a\u5e94\u7528\u5b9e\u6218]<\/span><\/li>\n<\/ol>\n<\/div>\n<p>\u5f88\u5947\u602a\uff0c\u660e\u660e\u4e66\u4e0a\u8bf4 Set \u662f\u65e0\u5e8f\u7684\uff0c\u90a3\u4e48\u8f93\u51fa\u5e94\u8be5\u662f\u968f\u673a\u7684\u624d\u5bf9\uff0c\u4e3a\u4f55\u8f93\u51fa\u603b\u662f\u4e00\u5b9a\u7684\u5462\uff1f\u4e0d\u7ba1 add \u7684\u987a\u5e8f\u5982\u4f55\uff0c\u8f93\u51fa\u603b\u662f\u4e00\u5b9a\u3002<\/p>\n<p>\u4e0a\u7f51\u67e5\u4e86\u4e0b\uff0c\u4ee5\u524d\u4e5f\u6709\u5f88\u591a\u7f51\u53cb\u6709\u8fd9\u6837\u7684\u7591\u60d1\uff0c\u8be6\u60c5\u5982\u4e0b\uff1a<\/p>\n<blockquote><p>\u770b\u5230\u300aThinking in Java\u300b\u4e2d\u6709\u8fd9\u4e48\u4e00\u6bb5\u4ee3\u7801\uff0c\u4e66\u4e2d\u7ed9\u51fa\u7684Output\u662f\u65e0\u5e8f\u7684\uff0c\u53ef\u662f\u6211\u5b9e\u9645\u8fd0\u884c\u51fa\u6765\u662f\u6709\u5e8f\u7684\uff0c\u5c31\u662f\u4ece0\u9012\u589e\u523029\uff0c\u8fd9\u662f\u4e3a\u4ec0\u4e48\u5462\uff1f<\/p>\n<div class=\"highlight\">\n<pre>public class SetOfInteger {\r\n    public static void main(String[] args){\r\n        Random rand=new Random(47);\r\n        Set&lt;Integer&gt; intset=new HashSet&lt;Integer&gt;();\r\n        for (int i=0;i&lt;10000;i++){\r\n            intset.add(rand.nextInt(30));\r\n        }\r\n        Iterator&lt;Integer&gt; iterator=intset.iterator();\r\n        while (iterator.hasNext()){\r\n            System.out.print(iterator.next()+\" \");\r\n        }\r\n    }\r\n}<\/pre>\n<\/div>\n<\/blockquote>\n<p>\u7f51\u53cb\u00a0RednaxelaFX\u00a0\u7684\u56de\u7b54\u7279\u522b\u4e0d\u9519\uff0c\u8fd9\u91cc\u4e5f\u987a\u4fbf\u8bb0\u5f55\u5e76\u5206\u4eab\uff1a<\/p>\n<blockquote>\n<div>\u4f5c\u8005\uff1aRednaxelaFX<br \/>\n\u94fe\u63a5\uff1ahttps:\/\/www.zhihu.com\/question\/28414001\/answer\/40733996<br \/>\n\u6765\u6e90\uff1a\u77e5\u4e4e<br \/>\n\u8457\u4f5c\u6743\u5f52\u4f5c\u8005\u6240\u6709\uff0c\u8f6c\u8f7d\u8bf7\u8054\u7cfb\u4f5c\u8005\u83b7\u5f97\u6388\u6743\u3002<\/p>\n<div class=\"zm-editable-content clearfix\">\u201c\u4e0d\u4fdd\u8bc1\u6709\u5e8f\u201d\u548c\u201c\u4fdd\u8bc1\u65e0\u5e8f\u201d\u4e0d\u7b49\u4ef7\uff0cHashSet\u7684iterator\u662f\u524d\u8005\u800c\u4e0d\u662f\u540e\u8005\uff0c\u6240\u4ee5\u5728\u4e00\u6b21\u8fd0\u884c\u4e2d\u770b\u5230\u6709\u5e8f\u7684\u7ed3\u679c\u4e5f\u662f\u6b63\u5e38\u7684\uff0c\u4f46\u4e0d\u80fd\u4f9d\u8d56\u8fd9\u4e2a\u6709\u5e8f\u884c\u4e3a\u3002<br \/>\n\u51b5\u4e14HashSet\u5e76\u4e0d\u5173\u5fc3key\u7684\u201c\u6392\u5e8f\u201d\uff0c\u5c31\u7b97\u5176iterator\u201c\u6709\u5e8f\u201d\u901a\u5e38\u4e5f\u662f\u8bf4\u201c\u6309\u5143\u7d20\u63d2\u5165\u987a\u5e8f\u201d\uff08LinkedHashSet\u5c31\u652f\u6301\u63d2\u5165\u987a\u5e8f\u904d\u5386\uff09\u3002\u9898\u4e3b\u5728\u6b64\u770b\u5230\u7684\u6240\u8c13\u201c\u6709\u5e8f\u201d\u7eaf\u7cb9\u662f\u4e2a\u5de7\u5408\u3002\u7136\u540e\u6211\u590d\u5236\u7c98\u8d34\u4e86\u9898\u4e3b\u7684\u4ee3\u7801\u8fd0\u884c\u4e86\u4e00\u6b21\uff1a<\/p>\n<div class=\"highlight\">\n<pre><code class=\"language-text\">$ java SetOfInteger\r\n0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 17 16 19 18 21 20 23 22 25 24 27 26 29 28 \r\n$ java -version\r\njava version \"1.7.0-internal-zing_99.99.99.99.dev\"\r\nZing Runtime Environment for Java Applications (build 1.7.0-internal-zing_99.99.99.99.dev-b65)\r\nZing 64-Bit Tiered VM (build 1.7.0-zing_99.99.99.99.dev-b870-product-azlinuxM-X86_64, mixed mode)\r\n<\/code><\/pre>\n<\/div>\n<p>\uff08Zing JDK7\u7684\u5f00\u53d1\u7248\uff09<br \/>\n\u5c31\u4e0d\u662f\u6709\u5e8f\u7684\u561b\u3002\u540c\u6837\u5728Oracle JDK7u51\u4e0a\u4e5f\u662f\u5982\u6b64\uff1a<\/p>\n<div class=\"highlight\">\n<pre><code class=\"language-text\">$ java SetOfInteger\r\n0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 17 16 19 18 21 20 23 22 25 24 27 26 29 28 \r\n$ java -version\r\njava version \"1.7.0_51\"\r\nJava(TM) SE Runtime Environment (build 1.7.0_51-b13)\r\nJava HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)\r\n<\/code><\/pre>\n<\/div>\n<p>\u6362\u5230Zing JDK8\uff1a<\/p>\n<div class=\"highlight\">\n<pre><code class=\"language-text\">$ java SetOfInteger\r\n0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 \r\n$ java -version\r\njava version \"1.8.0-internal-zing_99.99.99.99.dev\"\r\nZing Runtime Environment for Java Applications (build 1.8.0-internal-zing_99.99.99.99.dev-b65)\r\nZing 64-Bit Tiered VM (build 1.8.0-zing_99.99.99.99.dev-b870-product-azlinuxM-X86_64, mixed mode)\r\n<\/code><\/pre>\n<\/div>\n<p>\u518d\u6362\u5230Oracle JDK8u25\uff1a<\/p>\n<div class=\"highlight\">\n<pre><code class=\"language-text\">$ java SetOfInteger\r\n0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 \r\n$ java -version\r\njava version \"1.8.0_25\"\r\nJava(TM) SE Runtime Environment (build 1.8.0_25-b17)\r\nJava HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)\r\n<\/code><\/pre>\n<\/div>\n<p>\u5c31\u770b\u5230\u4e86\u9898\u4e3b\u8bf4\u7684\u6709\u5e8f\u884c\u4e3a\u3002<\/p>\n<p>JDK8\u7684HashSet\u5b9e\u73b0\u53d8\u4e86\uff0c\u5bfc\u81f4\u5143\u7d20\u63d2\u5165\u7684\u4f4d\u7f6e\u53d1\u751f\u4e86\u53d8\u5316\uff1biterator\u81ea\u8eab\u5b9e\u73b0\u7684\u987a\u5e8f\u5012\u6ca1\u53d8\uff0c\u8fd8\u662f\u6309\u7167\u5185\u90e8\u63d2\u5165\u7684\u4f4d\u7f6e\u987a\u5e8f\u6765\u904d\u5386\uff0c\u4e8e\u662f\u9898\u4e3b\u5c31\u770b\u5230\u4e86JDK7\u548cJDK8\u7684\u7ed3\u679c\u4e0d\u4e00\u6837\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u662fJDK7\u4e0eJDK8\u7684java.util.HashMap\u7684hash\u7b97\u6cd5\u4ee5\u53caHashMap\u7684\u6570\u636e\u5e03\u5c40\u53d1\u751f\u4e86\u53d8\u5316\u3002<\/p>\n<p>\u9898\u4e3b\u63d2\u5165HashSet\u7684\u662fInteger\uff0c\u5176hashCode()\u5b9e\u73b0\u5c31\u8fd4\u56deint\u503c\u672c\u8eab\u3002\u6240\u4ee5\u5728\u5bf9\u8c61hashCode\u8fd9\u4e00\u6b65\u5f15\u5165\u4e86\u5de7\u5408\u7684\u201c\u6309\u5927\u5c0f\u6392\u5e8f\u201d\u3002<br \/>\n\u7136\u540eHashMap.hash(Object)\u83b7\u53d6\u4e86\u5bf9\u8c61\u7684hashCode()\u4e4b\u540e\u4f1a\u5c1d\u8bd5\u8fdb\u4e00\u6b65\u6df7\u6dc6\u3002<br \/>\nJDK8\u7248java.util.HashMap\u5185\u7684hash\u7b97\u6cd5\u6bd4JDK7\u7248\u7684\u6df7\u6dc6\u7a0b\u5ea6\u4f4e\uff1b\u5728[0, 2^32-1]\u8303\u56f4\u5185\u7ecf\u8fc7HashMap.hash()\u4e4b\u540e\u8fd8\u662f\u5f97\u5230\u81ea\u5df1\u3002\u9898\u4e3b\u7684\u4f8b\u5b50\u6b63\u597d\u843d\u5165\u8fd9\u4e2a\u8303\u56f4\u5185\u3002\u5916\u52a0load factor\u6b63\u597d\u5728\u6b64\u4f8b\u4e2d\u8ba9\u8fd9\u4e2aHashMap\u6ca1\u6709hash\u51b2\u7a81\uff0c\u8fd9\u5c31\u5bfc\u81f4\u4f8b\u4e2d\u5143\u7d20\u6b63\u597d\u6309\u5927\u5c0f\u987a\u5e8f\u63d2\u5165\u5728HashMap\u7684\u5f00\u653e\u5f0f\u54c8\u5e0c\u8868\u91cc\u3002<br \/>\n\u6839\u636e\u5b83\u7684\u5b9e\u73b0\u7279\u5f81\uff0c\u628a\u9898\u4e3b\u7684\u4f8b\u5b50\u7a0d\u5fae\u4fee\u6539\u4e00\u4e0b\u7684\u8bdd\uff1a<\/p>\n<div class=\"highlight\">\n<pre><code class=\"language-text\">$ cat SetOfInteger.java \r\nimport java.util.*;\r\n\r\npublic class SetOfInteger {\r\n    public static void main(String[] args){\r\n        Random rand=new Random(47);\r\n        Set&lt;Integer&gt; intset=new HashSet&lt;Integer&gt;();\r\n        for (int i=0;i&lt;10000;i++){\r\n            intset.add(rand.nextInt(30) + (1 &lt;&lt; 16));\r\n        }\r\n        Iterator&lt;Integer&gt; iterator=intset.iterator();\r\n        while (iterator.hasNext()){\r\n            System.out.print((iterator.next() - (1 &lt;&lt; 16)) +\" \");\r\n        }\r\n    }\r\n}\r\n$ java SetOfInteger\r\n1 0 3 2 5 4 7 6 9 8 11 10 13 12 15 14 17 16 19 18 21 20 23 22 25 24 27 26 29 28 \r\n$ java -version\r\njava version \"1.8.0_25\"\r\nJava(TM) SE Runtime Environment (build 1.8.0_25-b17)\r\nJava HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)\r\n<\/code><\/pre>\n<\/div>\n<p>\u5c31\u53ef\u4ee5\u770b\u5230\u987a\u5e8f\u4e0d\u4e00\u6837\u4e86\u3002\u4fee\u6539\u7684\u5185\u5bb9\u5c31\u662f\u628a\u63d2\u5165\u7684\u6570\u5b57\u5148\u52a0\u4e0a2\u768416\u6b21\u65b9\uff0c\u7136\u540e\u62ff\u51fa\u6765\u4e4b\u540e\u518d\u51cf\u53bb2\u768416\u6b21\u65b9\uff0c\u800c\u5df2 ^_^<\/p>\n<\/div>\n<\/div>\n<\/blockquote>\n<p>\u8fd9\u91cc\u5982\u679c\u60f3\u8981\u77e5\u9053\u8f93\u51fa\u7684\u987a\u5e8f\u662f\u968f\u673a\u7684\uff0c\u53ef\u4ee5\u7b80\u5355\u5728 add \u65f6\uff0c\u52a0\u5165\u7684\u4e32\u7a0d\u5fae\u53d8\u4e00\u4e0b\uff0c\u5c31\u53ef\u4ee5\u770b\u51fa\u987a\u5e8f\u4e0e\u539f\u6765\u7684\u4e0d\u4e00\u6837\u4e86\uff0c\u6d4b\u8bd5\u5982\u4e0b\uff1a<\/p>\n<div class=\"dp-highlighter\">\n<div class=\"bar\">\n<div class=\"tools\"><b style=\"color: #000;\">Code<\/b>\u00a0\u00a0\u00a0<a href=\"#\">View<\/a><a href=\"#\">Print<\/a><\/div>\n<\/div>\n<ol class=\"dp-j\" start=\"1\">\n<li class=\"alt\"><span class=\"keyword\">package<\/span>\u00a0com.menglanglang.java.collection;<\/li>\n<li class=\"\"><\/li>\n<li class=\"alt\"><span class=\"keyword\">import<\/span>\u00a0java.util.*;<\/li>\n<li class=\"\"><span class=\"comment\">\/**<\/span><\/li>\n<li class=\"alt\"><span class=\"comment\">\u00a0*\u00a0Description:<\/span><\/li>\n<li class=\"\"><span class=\"comment\">\u00a0*\u00a0&lt;br\/&gt;\u7f51\u7ad9:\u00a0&lt;a\u00a0href=&#8221;http:\/\/www.crazyit.org&#8221;&gt;\u75af\u72c2Java\u8054\u76df&lt;\/a&gt;<\/span><\/li>\n<li class=\"alt\"><span class=\"comment\">\u00a0*\u00a0&lt;br\/&gt;Copyright\u00a0(C),\u00a02001-2016,\u00a0Yeeku.H.Lee<\/span><\/li>\n<li class=\"\"><span class=\"comment\">\u00a0*\u00a0&lt;br\/&gt;This\u00a0program\u00a0is\u00a0protected\u00a0by\u00a0copyright\u00a0laws.<\/span><\/li>\n<li class=\"alt\"><span class=\"comment\">\u00a0*\u00a0&lt;br\/&gt;Program\u00a0Name:<\/span><\/li>\n<li class=\"\"><span class=\"comment\">\u00a0*\u00a0&lt;br\/&gt;Date:<\/span><\/li>\n<li class=\"alt\"><span class=\"comment\">\u00a0*\u00a0@author\u00a0Yeeku.H.Lee\u00a0kongyeeku@163.com<\/span><\/li>\n<li class=\"\"><span class=\"comment\">\u00a0*\u00a0@version\u00a01.0<\/span><\/li>\n<li class=\"alt\"><span class=\"comment\">\u00a0*\/<\/span><\/li>\n<li class=\"\"><span class=\"keyword\">public<\/span>\u00a0<span class=\"keyword\">class<\/span>\u00a0IteratorTest<\/li>\n<li class=\"alt\">{<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0<span class=\"keyword\">public<\/span>\u00a0<span class=\"keyword\">static<\/span>\u00a0<span class=\"keyword\">void<\/span>\u00a0main(String[]\u00a0args)<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0{<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"comment\">\/\/\u00a0\u521b\u5efa\u96c6\u5408\u3001\u6dfb\u52a0\u5143\u7d20\u7684\u4ee3\u7801\u4e0e\u524d\u4e00\u4e2a\u7a0b\u5e8f\u76f8\u540c<\/span><\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Collection\u00a0books\u00a0=\u00a0<span class=\"keyword\">new<\/span>\u00a0HashSet();<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0books.add(<span class=\"string\">&#8220;<span style=\"color: #ff0000;\">\u5b5f<\/span>\u75af\u72c2Java\u8bb2\u4e49&#8221;<\/span>);<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0books.add(<span class=\"string\">&#8220;<span style=\"color: #ff0000;\">\u5b5f<\/span>\u8f7b\u91cf\u7ea7Java\u00a0EE\u4f01\u4e1a\u5e94\u7528\u5b9e\u6218&#8221;<\/span>);<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0books.add(<span class=\"string\">&#8220;<span style=\"color: #ff0000;\">\u5b5f<\/span>\u75af\u72c2Android\u8bb2\u4e49&#8221;<\/span>);<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"comment\">\/\/\u00a0\u83b7\u53d6books\u96c6\u5408\u5bf9\u5e94\u7684\u8fed\u4ee3\u5668<\/span><\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Iterator\u00a0it\u00a0=\u00a0books.iterator();<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"keyword\">while<\/span>(it.hasNext())<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"comment\">\/\/\u00a0it.next()\u65b9\u6cd5\u8fd4\u56de\u7684\u6570\u636e\u7c7b\u578b\u662fObject\u7c7b\u578b\uff0c\u56e0\u6b64\u9700\u8981\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362<\/span><\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0String\u00a0book\u00a0=\u00a0(String)it.next();<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0System.out.println(book);<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"keyword\">if<\/span>\u00a0(book.equals(<span class=\"string\">&#8220;\u75af\u72c2Java\u8bb2\u4e49&#8221;<\/span>))<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"comment\">\/\/\u00a0\u4ece\u96c6\u5408\u4e2d\u5220\u9664\u4e0a\u4e00\u6b21next\u65b9\u6cd5\u8fd4\u56de\u7684\u5143\u7d20<\/span><\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0it.remove();<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"comment\">\/\/\u00a0\u5bf9book\u53d8\u91cf\u8d4b\u503c\uff0c\u4e0d\u4f1a\u6539\u53d8\u96c6\u5408\u5143\u7d20\u672c\u8eab<\/span><\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0book\u00a0=\u00a0<span class=\"string\">&#8220;\u6d4b\u8bd5\u5b57\u7b26\u4e32&#8221;<\/span>;\u00a0\u00a0\u00a0<span class=\"comment\">\/\/\u2460<\/span><\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/li>\n<li class=\"\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0System.out.println(books);<\/li>\n<li class=\"alt\">\u00a0\u00a0\u00a0\u00a0}<\/li>\n<li class=\"\">}<\/li>\n<li class=\"alt\"><span class=\"comment\">\/\/\u00a0\u8f93\u51fa\uff1a<\/span><\/li>\n<li class=\"\"><span class=\"comment\">\/\/\u00a0\u5b5f\u75af\u72c2Java\u8bb2\u4e49<\/span><\/li>\n<li class=\"alt\"><span class=\"comment\">\/\/\u00a0\u5b5f\u75af\u72c2Android\u8bb2\u4e49<\/span><\/li>\n<li class=\"\"><span class=\"comment\">\/\/\u00a0\u5b5f\u8f7b\u91cf\u7ea7Java\u00a0EE\u4f01\u4e1a\u5e94\u7528\u5b9e\u6218<\/span><\/li>\n<li class=\"alt\"><span class=\"comment\">\/\/\u00a0[\u5b5f\u75af\u72c2Java\u8bb2\u4e49,\u00a0\u5b5f\u75af\u72c2Android\u8bb2\u4e49,\u00a0\u5b5f\u8f7b\u91cf\u7ea7Java\u00a0EE\u4f01\u4e1a\u5e94\u7528\u5b9e\u6218]<\/span><\/li>\n<\/ol>\n<\/div>\n<p>\u5171\u52c9~~<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4eca\u5929\u8fd0\u884c\u300a\u75af\u72c2Java\u8bb2\u4e49\u300b\u4e2d 8.2 \u4e2d\u7684 IteratorTest.java &hellip; <a href=\"http:\/\/www.menglanglang.cn\/?p=2950\">\u7ee7\u7eed\u9605\u8bfb <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ai_generated_summary":"","wpai_meta_description":"","footnotes":""},"categories":[135],"tags":[600,688,89],"class_list":["post-2950","post","type-post","status-publish","format-standard","hentry","category-java","tag-java","tag-set","tag-89"],"_links":{"self":[{"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/posts\/2950","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2950"}],"version-history":[{"count":1,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/posts\/2950\/revisions"}],"predecessor-version":[{"id":2951,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/posts\/2950\/revisions\/2951"}],"wp:attachment":[{"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2950"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2950"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2950"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}