{"id":2459,"date":"2025-10-21T10:31:02","date_gmt":"2025-10-21T02:31:02","guid":{"rendered":"https:\/\/zero-zl.cn\/?p=2459"},"modified":"2025-10-21T16:31:39","modified_gmt":"2025-10-21T08:31:39","slug":"java-%e9%9b%86%e5%90%88","status":"publish","type":"post","link":"https:\/\/zero-zl.cn\/index.php\/2025\/10\/21\/java-%e9%9b%86%e5%90%88\/","title":{"rendered":"Java \u96c6\u5408\u6982\u8ff0"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u642c\u8fd0\u81ea<a href=\"https:\/\/javabetter.cn\/collection\/gailan.html\">Java\u96c6\u5408\u6846\u67b6\u5168\u9762\u89e3\u6790 | \u4e8c\u54e5\u7684Java\u8fdb\u9636\u4e4b\u8def<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Java \u96c6\u5408\u6846\u67b6\u53ef\u4ee5\u5206\u4e3a\u4e24\u6761\u5927\u7684\u652f\u7ebf\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2460\u3001Collection\uff0c\u4e3b\u8981\u7531 List\u3001Set\u3001Queue \u7ec4\u6210\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>List \u4ee3\u8868\u6709\u5e8f\u3001\u53ef\u91cd\u590d\u7684\u96c6\u5408\uff0c\u5178\u578b\u4ee3\u8868\u5c31\u662f\u5c01\u88c5\u4e86\u52a8\u6001\u6570\u7ec4\u7684\u00a0<a href=\"https:\/\/javabetter.cn\/collection\/arraylist.html\" target=\"_blank\" rel=\"noreferrer noopener\">ArrayList<\/a>\u00a0\u548c\u5c01\u88c5\u4e86\u94fe\u8868\u7684\u00a0<a href=\"https:\/\/javabetter.cn\/collection\/linkedlist.html\" target=\"_blank\" rel=\"noreferrer noopener\">LinkedList<\/a>\uff1b<\/li>\n\n\n\n<li>Set \u4ee3\u8868\u65e0\u5e8f\u3001\u4e0d\u53ef\u91cd\u590d\u7684\u96c6\u5408\uff0c\u5178\u578b\u4ee3\u8868\u5c31\u662f HashSet \u548c TreeSet\uff1b<\/li>\n\n\n\n<li>Queue \u4ee3\u8868\u961f\u5217\uff0c\u5178\u578b\u4ee3\u8868\u5c31\u662f\u53cc\u7aef\u961f\u5217\u00a0<a href=\"https:\/\/javabetter.cn\/collection\/arraydeque.html\" target=\"_blank\" rel=\"noreferrer noopener\">ArrayDeque<\/a>\uff0c\u4ee5\u53ca\u4f18\u5148\u7ea7\u961f\u5217\u00a0<a href=\"https:\/\/javabetter.cn\/collection\/PriorityQueue.html\" target=\"_blank\" rel=\"noreferrer noopener\">PriorityQueue<\/a>\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u2461\u3001Map\uff0c\u4ee3\u8868\u952e\u503c\u5bf9\u7684\u96c6\u5408\uff0c\u5178\u578b\u4ee3\u8868\u5c31\u662f&nbsp;<a href=\"https:\/\/javabetter.cn\/collection\/hashmap.html\" target=\"_blank\" rel=\"noreferrer noopener\">HashMap<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/zero-zl.cn\/wp-content\/uploads\/2025\/10\/image-2-1024x472.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"472\" data-original=\"https:\/\/zero-zl.cn\/wp-content\/uploads\/2025\/10\/image-2-1024x472.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2460\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/javabetter.cn\/collection\/gailan.html#_01%E3%80%81list\">01\u3001List<\/a><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">List \u7684\u7279\u70b9\u662f\u5b58\u53d6<strong>\u6709\u5e8f<\/strong><em>\uff08\u8f93\u51fa\u987a\u5e8f\u4e0e\u63d2\u5165\u987a\u5e8f\u76f8\u540c\uff09<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uff0c\u53ef\u4ee5\u5b58\u653e<strong>\u91cd\u590d<\/strong>\u7684\u5143\u7d20\uff0c\u53ef\u4ee5\u7528\u4e0b\u6807\u5bf9\u5143\u7d20\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/javabetter.cn\/collection\/gailan.html#_1-arraylist\"><strong>1\uff09ArrayList<\/strong><\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u6765\u4e00\u6bb5 ArrayList \u7684\u589e\u5220\u6539\u67e5\uff0c\u5b66\u4f1a\u7528\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521b\u5efa\u4e00\u4e2a\u96c6\u5408\nArrayList&lt;String> list = new ArrayList&lt;String>();\n\/\/ \u6dfb\u52a0\u5143\u7d20\nlist.add(\"\u738b\u4e8c\");\nlist.add(\"\u6c89\u9ed8\");\nlist.add(\"\u9648\u6e05\u626c\");\n\n\/\/ \u904d\u5386\u96c6\u5408 for \u5faa\u73af\nfor (int i = 0; i &lt; list.size(); i++) {\n    String s = list.get(i);\n    System.out.println(s);\n}\n\/\/ \u904d\u5386\u96c6\u5408 for each\nfor (String s : list) {\n    System.out.println(s);\n}\n\n\/\/ \u5220\u9664\u5143\u7d20\nlist.remove(1);\n\/\/ \u904d\u5386\u96c6\u5408\nfor (String s : list) {\n    System.out.println(s);\n}\n\n\/\/ \u4fee\u6539\u5143\u7d20\nlist.set(1, \"\u738b\u4e8c\u72d7\");\n\/\/ \u904d\u5386\u96c6\u5408\nfor (String s : list) {\n    System.out.println(s);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0b ArrayList \u7684\u7279\u5f81\uff0c<a href=\"https:\/\/javabetter.cn\/collection\/arraylist.html\" target=\"_blank\" rel=\"noreferrer noopener\">\u540e\u9762\u8fd8\u4f1a\u8be6\u7ec6\u8bb2<\/a>\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ArrayList \u662f\u7531<strong>\u52a8\u6001\u6570\u7ec4<\/strong>\u5b9e\u73b0\u7684\uff0c\u652f\u6301<strong>\u968f\u673a\u5b58\u53d6<\/strong>\uff0c\u4e5f\u5c31\u662f\u53ef\u4ee5\u901a\u8fc7\u4e0b\u6807\u76f4\u63a5\u5b58\u53d6\u5143\u7d20\uff1b<\/li>\n\n\n\n<li>\u4ece<strong>\u5c3e\u90e8\u63d2\u5165\u548c\u5220\u9664\u5143\u7d20\u4f1a\u6bd4\u8f83\u5feb\u6377<\/strong>\uff0c\u4ece\u4e2d\u95f4\u63d2\u5165\u548c\u5220\u9664\u5143\u7d20\u4f1a\u6bd4\u8f83\u4f4e\u6548\uff0c\u56e0\u4e3a\u6d89\u53ca\u5230\u6570\u7ec4\u5143\u7d20\u7684\u590d\u5236\u548c\u79fb\u52a8\uff1b<\/li>\n\n\n\n<li>\u5982\u679c\u5185\u90e8\u6570\u7ec4\u7684\u5bb9\u91cf\u4e0d\u8db3\u65f6\u4f1a<strong>\u81ea\u52a8\u6269\u5bb9<\/strong>\uff0c\u56e0\u6b64\u5f53\u5143\u7d20\u975e\u5e38\u5e9e\u5927\u7684\u65f6\u5019\uff0c\u6548\u7387\u4f1a\u6bd4\u8f83\u4f4e\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/javabetter.cn\/collection\/gailan.html#_2-linkedlist\"><strong>2\uff09LinkedList<\/strong><\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u540c\u6837\u5148\u6765\u4e00\u6bb5 LinkedList \u7684\u589e\u5220\u6539\u67e5\uff0c\u548c ArrayList \u51e0\u4e4e\u6ca1\u4ec0\u4e48\u5dee\u522b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521b\u5efa\u4e00\u4e2a\u96c6\u5408\nLinkedList&lt;String> list = new LinkedList&lt;String>();\n\/\/ \u6dfb\u52a0\u5143\u7d20\nlist.add(\"\u738b\u4e8c\");\nlist.add(\"\u6c89\u9ed8\");\nlist.add(\"\u9648\u6e05\u626c\");\n\n\/\/ \u904d\u5386\u96c6\u5408 for \u5faa\u73af\nfor (int i = 0; i &lt; list.size(); i++) {\n    String s = list.get(i);\n    System.out.println(s);\n}\n\/\/ \u904d\u5386\u96c6\u5408 for each\nfor (String s : list) {\n    System.out.println(s);\n}\n\n\/\/ \u5220\u9664\u5143\u7d20\nlist.remove(1);\n\/\/ \u904d\u5386\u96c6\u5408\nfor (String s : list) {\n    System.out.println(s);\n}\n\n\/\/ \u4fee\u6539\u5143\u7d20\nlist.set(1, \"\u738b\u4e8c\u72d7\");\n\/\/ \u904d\u5386\u96c6\u5408\nfor (String s : list) {\n    System.out.println(s);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u8fc7\uff0cLinkedList \u548c ArrayList \u4ecd\u7136\u6709\u8f83\u5927\u7684\u4e0d\u540c\uff0c<a href=\"https:\/\/javabetter.cn\/collection\/linkedlist.html\" target=\"_blank\" rel=\"noreferrer noopener\">\u540e\u9762\u4e5f\u4f1a\u8be6\u7ec6\u5730\u8bb2<\/a>\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>LinkedList \u662f\u7531<strong>\u53cc\u5411\u94fe\u8868<\/strong>\u5b9e\u73b0\u7684\uff0c\u4e0d\u652f\u6301\u968f\u673a\u5b58\u53d6\uff0c\u53ea\u80fd\u4ece\u4e00\u7aef\u5f00\u59cb\u904d\u5386\uff0c\u76f4\u5230\u627e\u5230\u9700\u8981\u7684\u5143\u7d20\u540e\u8fd4\u56de\uff1b<\/li>\n\n\n\n<li><strong>\u4efb\u610f\u4f4d\u7f6e\u63d2\u5165\u548c\u5220\u9664\u5143\u7d20\u90fd\u5f88\u65b9\u4fbf<\/strong>\uff0c\u56e0\u4e3a\u53ea\u9700\u8981\u6539\u53d8\u524d\u4e00\u4e2a\u8282\u70b9\u548c\u540e\u4e00\u4e2a\u8282\u70b9\u7684\u5f15\u7528\u5373\u53ef\uff0c\u4e0d\u50cf ArrayList \u90a3\u6837\u9700\u8981\u590d\u5236\u548c\u79fb\u52a8\u6570\u7ec4\u5143\u7d20\uff1b<\/li>\n\n\n\n<li>\u56e0\u4e3a\u6bcf\u4e2a\u5143\u7d20\u90fd\u5b58\u50a8\u4e86\u524d\u4e00\u4e2a\u548c\u540e\u4e00\u4e2a\u8282\u70b9\u7684\u5f15\u7528\uff0c\u6240\u4ee5\u76f8\u5bf9\u6765\u8bf4\uff0c<strong>\u5360\u7528\u7684\u5185\u5b58\u7a7a\u95f4<\/strong>\u4f1a\u6bd4 ArrayList \u591a\u4e00\u4e9b\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/javabetter.cn\/collection\/gailan.html#_02%E3%80%81set\">02\u3001Set<\/a><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Set \u7684\u7279\u70b9\u662f\u5b58\u53d6<strong>\u65e0\u5e8f<\/strong><em>\uff08\u8f93\u51fa\u987a\u5e8f\u53ef\u80fd\u4e0e\u63d2\u5165\u987a\u5e8f\u4e0d\u540c\uff0c\u53d6\u51b3\u4e8e\u54c8\u5e0c\u503c\uff09<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uff0c\u4e0d\u53ef\u4ee5\u5b58\u653e\u91cd\u590d\u7684\u5143\u7d20\uff0c\u4e0d\u53ef\u4ee5\u7528\u4e0b\u6807\u5bf9\u5143\u7d20\u8fdb\u884c\u64cd\u4f5c\uff0c\u548c List \u6709\u5f88\u591a\u4e0d\u540c\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/javabetter.cn\/collection\/gailan.html#_1-hashset\">1\uff09HashSet<\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">HashSet \u5176\u5b9e\u662f<strong>\u7531 HashMap \u5b9e\u73b0<\/strong>\u7684\uff0c\u53ea\u4e0d\u8fc7\u503c\u7531\u4e00\u4e2a<strong>\u56fa\u5b9a\u7684 Object \u5bf9\u8c61\u586b\u5145<\/strong>\uff0c\u800c\u952e\u7528\u4e8e\u64cd\u4f5c\u3002\u6765\u7b80\u5355\u770b\u4e00\u4e0b\u5b83\u7684\u6e90\u7801\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class HashSet&lt;E>\n    extends AbstractSet&lt;E>\n    implements Set&lt;E>, Cloneable, java.io.Serializable\n{\n    private transient HashMap&lt;E,Object> map;\n\n    \/\/ Dummy value to associate with an Object in the backing Map\n    private static final Object PRESENT = new Object();\n\n    public HashSet() {\n        map = new HashMap&lt;>();\n    }\n\n    public boolean add(E e) {\n        return map.put(e, PRESENT)==null;\n    }\n\n    public boolean remove(Object o) {\n        return map.remove(o)==PRESENT;\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0cHashSet \u5e76\u4e0d\u5e38\u7528\uff0c\u6bd4\u5982\uff0c\u5982\u679c\u6211\u4eec\u9700\u8981\u6309\u7167\u987a\u5e8f\u5b58\u50a8\u4e00\u7ec4\u5143\u7d20\uff0c\u90a3\u4e48 ArrayList \u548c LinkedList \u53ef\u80fd\u66f4\u9002\u5408\uff1b\u5982\u679c\u6211\u4eec\u9700\u8981\u5b58\u50a8\u952e\u503c\u5bf9\u5e76\u6839\u636e\u952e\u8fdb\u884c\u67e5\u627e\uff0c\u90a3\u4e48 HashMap \u53ef\u80fd\u66f4\u9002\u5408\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6765\u4e00\u6bb5\u589e\u5220\u6539\u67e5\u4f53\u9a8c\u4e00\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521b\u5efa\u4e00\u4e2a\u65b0\u7684HashSet\nHashSet&lt;String> set = new HashSet&lt;>();\n\n\/\/ \u6dfb\u52a0\u5143\u7d20\nset.add(\"\u6c89\u9ed8\");\nset.add(\"\u738b\u4e8c\");\nset.add(\"\u9648\u6e05\u626c\");\n\n\/\/ \u8f93\u51faHashSet\u7684\u5143\u7d20\u4e2a\u6570\nSystem.out.println(\"HashSet size: \" + set.size()); \/\/ output: 3\n\n\/\/ \u5224\u65ad\u5143\u7d20\u662f\u5426\u5b58\u5728\u4e8eHashSet\u4e2d\nboolean containsWanger = set.contains(\"\u738b\u4e8c\");\nSystem.out.println(\"Does set contain '\u738b\u4e8c'? \" + containsWanger); \/\/ output: true\n\n\/\/ \u5220\u9664\u5143\u7d20\nboolean removeWanger = set.remove(\"\u738b\u4e8c\");\nSystem.out.println(\"Removed '\u738b\u4e8c'? \" + removeWanger); \/\/ output: true\n\n\/\/ \u4fee\u6539\u5143\u7d20\uff0c\u9700\u8981\u5148\u5220\u9664\u540e\u6dfb\u52a0\nboolean removeChenmo = set.remove(\"\u6c89\u9ed8\");\nboolean addBuChenmo = set.add(\"\u4e0d\u6c89\u9ed8\");\nSystem.out.println(\"Modified set? \" + (removeChenmo &amp;&amp; addBuChenmo)); \/\/ output: true\n\n\/\/ \u8f93\u51fa\u4fee\u6539\u540e\u7684HashSet\nSystem.out.println(\"HashSet after modification: \" + set); \/\/ output: &#91;\u9648\u6e05\u626c, \u4e0d\u6c89\u9ed8]<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">HashSet \u4e3b\u8981\u7528\u4e8e<strong>\u53bb\u91cd<\/strong>\uff0c\u6bd4\u5982\uff0c\u6211\u4eec\u9700\u8981\u7edf\u8ba1\u4e00\u7bc7\u6587\u7ae0\u4e2d\u6709\u591a\u5c11\u4e2a\u4e0d\u91cd\u590d\u7684\u5355\u8bcd\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528 HashSet \u6765\u5b9e\u73b0\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521b\u5efa\u4e00\u4e2a HashSet \u5bf9\u8c61\nHashSet&lt;String> set = new HashSet&lt;>();\n\n\/\/ \u6dfb\u52a0\u5143\u7d20\nset.add(\"\u6c89\u9ed8\");\nset.add(\"\u738b\u4e8c\");\nset.add(\"\u9648\u6e05\u626c\");\nset.add(\"\u6c89\u9ed8\");\n\n\/\/ \u8f93\u51fa HashSet \u7684\u5143\u7d20\u4e2a\u6570\nSystem.out.println(\"HashSet size: \" + set.size()); \/\/ output: 3\n\n\/\/ \u904d\u5386 HashSet\nfor (String s : set) {\n    System.out.println(s);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ece\u4e0a\u9762\u7684\u4f8b\u5b50\u53ef\u4ee5\u770b\u5f97\u51fa\uff0cHashSet \u4f1a\u81ea\u52a8\u53bb\u91cd\uff0c\u56e0\u4e3a\u5b83\u662f\u7528 HashMap \u5b9e\u73b0\u7684\uff0c<a href=\"https:\/\/javabetter.cn\/collection\/hashmap.html\" target=\"_blank\" rel=\"noreferrer noopener\">HashMap<\/a>&nbsp;\u7684\u952e\u662f\u552f\u4e00\u7684\uff08\u54c8\u5e0c\u503c\uff09\uff0c\u76f8\u540c\u952e\u7684\u503c\u4f1a\u8986\u76d6\u6389\u539f\u6765\u7684\u503c\uff0c\u4e8e\u662f\u7b2c\u4e8c\u6b21&nbsp;<code>set.add(\"\u6c89\u9ed8\")<\/code>&nbsp;\u7684\u65f6\u5019\u5c31\u8986\u76d6\u4e86\u7b2c\u4e00\u6b21\u7684&nbsp;<code>set.add(\"\u6c89\u9ed8\")<\/code>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u5728\u300a<a href=\"https:\/\/paicoding.com\/column\/7\/15\" target=\"_blank\" rel=\"noreferrer noopener\">LeetCode \u7684\u7b2c 15 \u9898\uff1a\u4e09\u6570\u4e4b\u548c<\/a>\u300b\u7684\u65f6\u5019\u7528\u5230\u4e86 HashSet\uff0c\u5927\u5bb6\u53ef\u4ee5\u901a\u8fc7\u94fe\u63a5\u53bb\u67e5\u770b\u4e00\u4e0b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/javabetter.cn\/collection\/gailan.html#_2-linkedhashset\">2\uff09LinkedHashSet<\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">LinkedHashSet \u867d\u7136\u7ee7\u627f\u81ea HashSet\uff0c\u5176\u5b9e\u662f\u7531&nbsp;<a href=\"https:\/\/javabetter.cn\/collection\/linkedhashmap.html\" target=\"_blank\" rel=\"noreferrer noopener\">LinkedHashMap<\/a>&nbsp;\u5b9e\u73b0\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u662f LinkedHashSet \u7684\u65e0\u53c2\u6784\u9020\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public LinkedHashSet() {\n    super(16, .75f, true);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/javabetter.cn\/oo\/this-super.html\" target=\"_blank\" rel=\"noreferrer noopener\">super<\/a>&nbsp;\u7684\u610f\u601d\u662f\u5b83\u5c06\u8c03\u7528\u7236\u7c7b\u7684 HashSet \u7684\u4e00\u4e2a\u6709\u53c2\u6784\u9020\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>HashSet(int initialCapacity, float loadFactor, boolean dummy) {\n    map = new LinkedHashMap&lt;&gt;(initialCapacity, loadFactor);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u770b\u5230&nbsp;<a href=\"https:\/\/javabetter.cn\/collection\/linkedhashmap.html\" target=\"_blank\" rel=\"noreferrer noopener\">LinkedHashMap<\/a>&nbsp;\u4e86\u5427\uff0c\u8fd9\u4e2a\u6211\u4eec\u540e\u9762\u4f1a\u53bb\u8bb2\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u597d\u5427\uff0c\u6765\u770b\u4e00\u6bb5 LinkedHashSet \u7684\u589e\u5220\u6539\u67e5\u5427\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>LinkedHashSet&lt;String> set = new LinkedHashSet&lt;>();\n\n\/\/ \u6dfb\u52a0\u5143\u7d20\nset.add(\"\u6c89\u9ed8\");\nset.add(\"\u738b\u4e8c\");\nset.add(\"\u9648\u6e05\u626c\");\n\n\/\/ \u5220\u9664\u5143\u7d20\nset.remove(\"\u738b\u4e8c\");\n\n\/\/ \u4fee\u6539\u5143\u7d20\nset.remove(\"\u6c89\u9ed8\");\nset.add(\"\u6c89\u9ed8\u7684\u529b\u91cf\");\n\n\/\/ \u67e5\u627e\u5143\u7d20\nboolean hasChenQingYang = set.contains(\"\u9648\u6e05\u626c\");\nSystem.out.println(\"set\u5305\u542b\u9648\u6e05\u626c\u5417\uff1f\" + hasChenQingYang);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u4ee5\u4e0a\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u521b\u5efa\u4e86\u4e00\u4e2a LinkedHashSet \u5bf9\u8c61\uff0c\u7136\u540e\u4f7f\u7528 add \u65b9\u6cd5\u4f9d\u6b21\u6dfb\u52a0\u4e86\u4e09\u4e2a\u5143\u7d20\uff1a\u6c89\u9ed8\u3001\u738b\u4e8c\u548c\u9648\u6e05\u626c\u3002\u63a5\u7740\uff0c\u6211\u4eec\u4f7f\u7528 remove \u65b9\u6cd5\u5220\u9664\u4e86\u738b\u4e8c\u8fd9\u4e2a\u5143\u7d20\uff0c\u5e76\u4f7f\u7528 remove \u548c add \u65b9\u6cd5\u4fee\u6539\u4e86\u6c89\u9ed8\u8fd9\u4e2a\u5143\u7d20\u3002\u6700\u540e\uff0c\u6211\u4eec\u4f7f\u7528 contains \u65b9\u6cd5\u67e5\u627e\u4e86\u9648\u6e05\u626c\u8fd9\u4e2a\u5143\u7d20\u662f\u5426\u5b58\u5728\u4e8e set \u4e2d\uff0c\u5e76\u6253\u5370\u4e86\u7ed3\u679c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">LinkedHashSet \u662f\u4e00\u79cd\u57fa\u4e8e\u54c8\u5e0c\u8868\u5b9e\u73b0\u7684 Set \u63a5\u53e3\uff0c\u5b83\u7ee7\u627f\u81ea HashSet\uff0c\u5e76\u4e14\u4f7f\u7528\u94fe\u8868\u7ef4\u62a4\u4e86\u5143\u7d20\u7684\u63d2\u5165\u987a\u5e8f\u3002\u56e0\u6b64\uff0c\u5b83\u65e2\u5177\u6709 HashSet \u7684\u5feb\u901f\u67e5\u627e\u3001\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\u7684\u4f18\u70b9\uff0c\u53c8\u53ef\u4ee5\u7ef4\u62a4\u5143\u7d20\u7684\u63d2\u5165\u987a\u5e8f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/javabetter.cn\/collection\/gailan.html#_3-treeset\">3\uff09TreeSet<\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0e TreeMap \u76f8\u4f3c\uff0cTreeSet \u662f\u4e00\u79cd<strong>\u57fa\u4e8e\u7ea2\u9ed1\u6811\u5b9e\u73b0<\/strong>\u7684<strong>\u6709\u5e8f\u96c6\u5408<\/strong><em>\uff08\u8fd9\u91cc\u7684\u6709\u5e8f\u6307\u7684\u662f\u81ea\u7136\u6392\u5e8f\uff0c\u4f8b\u5982\u6309\u5b57\u6bcd\u987a\u5e8f\u8f93\u51fa\uff09<\/em>\uff0c\u5b83\u5b9e\u73b0\u4e86 SortedSet \u63a5\u53e3\uff0c\u53ef\u4ee5\u81ea\u52a8\u5bf9\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u8fdb\u884c\u6392\u5e8f\u3002\u6309\u7167\u952e\u7684\u81ea\u7136\u987a\u5e8f\u6216\u6307\u5b9a\u7684\u6bd4\u8f83\u5668\u987a\u5e8f\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521b\u5efa\u4e00\u4e2a TreeSet \u5bf9\u8c61\nTreeSet&lt;String> set = new TreeSet&lt;>();\n\n\/\/ \u6dfb\u52a0\u5143\u7d20\nset.add(\"\u6c89\u9ed8\");\nset.add(\"\u738b\u4e8c\");\nset.add(\"\u9648\u6e05\u626c\");\nSystem.out.println(set); \/\/ \u8f93\u51fa &#91;\u6c89\u9ed8, \u738b\u4e8c, \u9648\u6e05\u626c]\n\n\/\/ \u5220\u9664\u5143\u7d20\nset.remove(\"\u738b\u4e8c\");\nSystem.out.println(set); \/\/ \u8f93\u51fa &#91;\u6c89\u9ed8, \u9648\u6e05\u626c]\n\n\/\/ \u4fee\u6539\u5143\u7d20\uff1aTreeSet \u4e2d\u7684\u5143\u7d20\u4e0d\u652f\u6301\u76f4\u63a5\u4fee\u6539\uff0c\u9700\u8981\u5148\u5220\u9664\u518d\u6dfb\u52a0\nset.remove(\"\u9648\u6e05\u626c\");\nset.add(\"\u9648\u9752\u9633\");\nSystem.out.println(set); \/\/ \u8f93\u51fa &#91;\u6c89\u9ed8, \u9648\u9752\u9633]\n\n\/\/ \u67e5\u627e\u5143\u7d20\nSystem.out.println(set.contains(\"\u6c89\u9ed8\")); \/\/ \u8f93\u51fa true\nSystem.out.println(set.contains(\"\u738b\u4e8c\")); \/\/ \u8f93\u51fa false<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cTreeSet \u4e0d\u5141\u8bb8\u63d2\u5165 null \u5143\u7d20\uff0c\u5426\u5219\u4f1a\u629b\u51fa NullPointerException \u5f02\u5e38\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/javabetter.cn\/collection\/gailan.html#_03%E3%80%81queue\">03\u3001Queue<\/a><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Queue\uff0c\u4e5f\u5c31\u662f\u961f\u5217\uff0c\u901a\u5e38\u9075\u5faa<strong>\u5148\u8fdb\u5148\u51fa\uff08FIFO\uff09<\/strong>\u7684\u539f\u5219\uff0c\u65b0\u5143\u7d20\u63d2\u5165\u5230\u961f\u5217\u7684\u5c3e\u90e8\uff0c\u8bbf\u95ee\u5143\u7d20\u8fd4\u56de\u961f\u5217\u7684\u5934\u90e8\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/javabetter.cn\/collection\/gailan.html#_1-arraydeque\">1\uff09ArrayDeque<\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ece\u540d\u5b57\u4e0a\u53ef\u4ee5\u770b\u5f97\u51fa\uff0cArrayDeque \u662f\u4e00\u4e2a\u57fa\u4e8e\u6570\u7ec4\u5b9e\u73b0\u7684\u53cc\u7aef\u961f\u5217\uff0c\u4e3a\u4e86\u6ee1\u8db3\u53ef\u4ee5\u540c\u65f6\u5728\u6570\u7ec4\u4e24\u7aef\u63d2\u5165\u6216\u5220\u9664\u5143\u7d20\u7684\u9700\u6c42\uff0c\u6570\u7ec4\u5fc5\u987b\u662f\u5faa\u73af\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u6570\u7ec4\u7684\u4efb\u4f55\u4e00\u70b9\u90fd\u53ef\u4ee5\u88ab\u770b\u4f5c\u662f\u8d77\u70b9\u6216\u8005\u7ec8\u70b9\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u662f\u4e00\u4e2a\u5305\u542b\u4e86 4 \u4e2a\u5143\u7d20\u7684\u53cc\u7aef\u961f\u5217\uff0c\u548c\u4e00\u4e2a\u5305\u542b\u4e86 5 \u4e2a\u5143\u7d20\u7684\u53cc\u7aef\u961f\u5217\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/zero-zl.cn\/wp-content\/uploads\/2025\/10\/image-3-1024x667.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"667\" data-original=\"https:\/\/zero-zl.cn\/wp-content\/uploads\/2025\/10\/image-3-1024x667.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2463\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">head \u6307\u5411\u961f\u9996\u7684\u7b2c\u4e00\u4e2a\u6709\u6548\u7684\u5143\u7d20\uff0ctail \u6307\u5411\u961f\u5c3e\u7b2c\u4e00\u4e2a\u53ef\u4ee5\u63d2\u5165\u5143\u7d20\u7684\u7a7a\u4f4d\uff0c\u56e0\u4e3a\u662f\u5faa\u73af\u6570\u7ec4\uff0c\u6240\u4ee5 head \u4e0d\u4e00\u5b9a\u4ece\u662f\u4ece 0 \u5f00\u59cb\uff0ctail \u4e5f\u4e0d\u4e00\u5b9a\u603b\u662f\u6bd4 head \u5927\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6765\u4e00\u6bb5 ArrayDeque \u7684\u589e\u5220\u6539\u67e5\u5427\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521b\u5efa\u4e00\u4e2aArrayDeque\nArrayDeque&lt;String> deque = new ArrayDeque&lt;>();\n\n\/\/ \u6dfb\u52a0\u5143\u7d20\ndeque.add(\"\u6c89\u9ed8\");\ndeque.add(\"\u738b\u4e8c\");\ndeque.add(\"\u9648\u6e05\u626c\");\n\n\/\/ \u5220\u9664\u5143\u7d20\ndeque.remove(\"\u738b\u4e8c\");\n\n\/\/ \u4fee\u6539\u5143\u7d20\ndeque.remove(\"\u6c89\u9ed8\");\ndeque.add(\"\u6c89\u9ed8\u7684\u529b\u91cf\");\n\n\/\/ \u67e5\u627e\u5143\u7d20\nboolean hasChenQingYang = deque.contains(\"\u9648\u6e05\u626c\");\nSystem.out.println(\"deque\u5305\u542b\u9648\u6e05\u626c\u5417\uff1f\" + hasChenQingYang);<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/javabetter.cn\/collection\/gailan.html#_2-linkedlist-1\">2\uff09LinkedList<\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">LinkedList \u4e00\u822c\u5e94\u8be5\u5f52\u5728 List \u4e0b\uff0c\u53ea\u4e0d\u8fc7\uff0c\u5b83\u4e5f\u5b9e\u73b0\u4e86 Deque \u63a5\u53e3\uff0c\u53ef\u4ee5\u4f5c\u4e3a\u961f\u5217\u6765\u4f7f\u7528\u3002\u7b49\u4e8e\u8bf4\uff0cLinkedList \u540c\u65f6\u5b9e\u73b0\u4e86 Stack\u3001Queue\u3001PriorityQueue \u7684\u6240\u6709\u529f\u80fd\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class LinkedList&lt;E>\n    extends AbstractSequentialList&lt;E>\n    implements List&lt;E>, Deque&lt;E>, Cloneable, java.io.Serializable\n{}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6362\u53e5\u8bdd\u8bf4\uff0cLinkedList \u548c ArrayDeque \u90fd\u662f Java \u96c6\u5408\u6846\u67b6\u4e2d\u7684\u53cc\u5411\u961f\u5217\uff08deque\uff09\uff0c\u5b83\u4eec\u90fd\u652f\u6301\u5728\u961f\u5217\u7684\u4e24\u7aef\u8fdb\u884c\u5143\u7d20\u7684\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\u3002\u4e0d\u8fc7\uff0cLinkedList \u548c ArrayDeque \u5728\u5b9e\u73b0\u4e0a\u6709\u4e00\u4e9b\u4e0d\u540c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5e95\u5c42\u5b9e\u73b0\u65b9\u5f0f\u4e0d\u540c\uff1aLinkedList \u662f\u57fa\u4e8e\u94fe\u8868\u5b9e\u73b0\u7684\uff0c\u800c ArrayDeque \u662f\u57fa\u4e8e\u6570\u7ec4\u5b9e\u73b0\u7684\u3002<\/li>\n\n\n\n<li>\u968f\u673a\u8bbf\u95ee\u7684\u6548\u7387\u4e0d\u540c\uff1a\u7531\u4e8e\u5e95\u5c42\u5b9e\u73b0\u65b9\u5f0f\u7684\u4e0d\u540c\uff0cLinkedList \u5bf9\u4e8e\u968f\u673a\u8bbf\u95ee\u7684\u6548\u7387\u8f83\u4f4e\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a O(n)\uff0c\u800c ArrayDeque \u53ef\u4ee5\u901a\u8fc7\u4e0b\u6807\u968f\u673a\u8bbf\u95ee\u5143\u7d20\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a O(1)\u3002<\/li>\n\n\n\n<li>\u8fed\u4ee3\u5668\u7684\u6548\u7387\u4e0d\u540c\uff1aLinkedList \u5bf9\u4e8e\u8fed\u4ee3\u5668\u7684\u6548\u7387\u6bd4\u8f83\u4f4e\uff0c\u56e0\u4e3a\u9700\u8981\u901a\u8fc7\u94fe\u8868\u8fdb\u884c\u904d\u5386\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a O(n)\uff0c\u800c ArrayDeque \u7684\u8fed\u4ee3\u5668\u6548\u7387\u6bd4\u8f83\u9ad8\uff0c\u56e0\u4e3a\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a O(1)\u3002<\/li>\n\n\n\n<li>\u5185\u5b58\u5360\u7528\u4e0d\u540c\uff1a\u7531\u4e8e LinkedList \u662f\u57fa\u4e8e\u94fe\u8868\u5b9e\u73b0\u7684\uff0c\u5b83\u5728\u5b58\u50a8\u5143\u7d20\u65f6\u9700\u8981\u989d\u5916\u7684\u7a7a\u95f4\u6765\u5b58\u50a8\u94fe\u8868\u8282\u70b9\uff0c\u56e0\u6b64\u5185\u5b58\u5360\u7528\u76f8\u5bf9\u8f83\u9ad8\uff0c\u800c ArrayDeque \u662f\u57fa\u4e8e\u6570\u7ec4\u5b9e\u73b0\u7684\uff0c\u5185\u5b58\u5360\u7528\u76f8\u5bf9\u8f83\u4f4e\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u6b64\uff0c\u5728\u9009\u62e9\u4f7f\u7528 LinkedList \u8fd8\u662f ArrayDeque \u65f6\uff0c\u9700\u8981\u6839\u636e\u5177\u4f53\u7684\u4e1a\u52a1\u573a\u666f\u548c\u9700\u6c42\u6765\u9009\u62e9\u3002\u5982\u679c\u9700\u8981\u5728\u53cc\u5411\u961f\u5217\u7684\u4e24\u7aef\u8fdb\u884c\u9891\u7e41\u7684\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\uff0c\u5e76\u4e14\u9700\u8981\u968f\u673a\u8bbf\u95ee\u5143\u7d20\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528 ArrayDeque\uff1b\u5982\u679c\u9700\u8981\u5728\u961f\u5217\u4e2d\u95f4\u8fdb\u884c\u9891\u7e41\u7684\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528 LinkedList\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6765\u4e00\u6bb5 LinkedList \u4f5c\u4e3a\u961f\u5217\u65f6\u5019\u7684\u589e\u5220\u6539\u67e5\u5427\uff0c\u6ce8\u610f\u548c\u5b83\u4f5c\u4e3a List \u7684\u65f6\u5019\u6709\u5f88\u5927\u7684\u4e0d\u540c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521b\u5efa\u4e00\u4e2a LinkedList \u5bf9\u8c61\nLinkedList&lt;String> queue = new LinkedList&lt;>();\n\n\/\/ \u6dfb\u52a0\u5143\u7d20\nqueue.offer(\"\u6c89\u9ed8\");\nqueue.offer(\"\u738b\u4e8c\");\nqueue.offer(\"\u9648\u6e05\u626c\");\nSystem.out.println(queue); \/\/ \u8f93\u51fa &#91;\u6c89\u9ed8, \u738b\u4e8c, \u9648\u6e05\u626c]\n\n\/\/ \u5220\u9664\u5143\u7d20\nqueue.poll();\nSystem.out.println(queue); \/\/ \u8f93\u51fa &#91;\u738b\u4e8c, \u9648\u6e05\u626c]\n\n\/\/ \u4fee\u6539\u5143\u7d20\uff1aLinkedList \u4e2d\u7684\u5143\u7d20\u4e0d\u652f\u6301\u76f4\u63a5\u4fee\u6539\uff0c\u9700\u8981\u5148\u5220\u9664\u518d\u6dfb\u52a0\nString first = queue.poll();\nqueue.offer(\"\u738b\u5927\u4e8c\");\nSystem.out.println(queue); \/\/ \u8f93\u51fa &#91;\u9648\u6e05\u626c, \u738b\u5927\u4e8c]\n\n\/\/ \u67e5\u627e\u5143\u7d20\uff1aLinkedList \u4e2d\u7684\u5143\u7d20\u53ef\u4ee5\u4f7f\u7528 get() \u65b9\u6cd5\u8fdb\u884c\u67e5\u627e\nSystem.out.println(queue.get(0)); \/\/ \u8f93\u51fa \u9648\u6e05\u626c\nSystem.out.println(queue.contains(\"\u6c89\u9ed8\")); \/\/ \u8f93\u51fa false\n\n\/\/ \u67e5\u627e\u5143\u7d20\uff1a\u4f7f\u7528\u8fed\u4ee3\u5668\u7684\u65b9\u5f0f\u67e5\u627e\u9648\u6e05\u626c\n\/\/ \u4f7f\u7528\u8fed\u4ee3\u5668\u4f9d\u6b21\u904d\u5386\u5143\u7d20\u5e76\u67e5\u627e\nIterator&lt;String> iterator = queue.iterator();\nwhile (iterator.hasNext()) {\n    String element = iterator.next();\n    if (element.equals(\"\u9648\u6e05\u626c\")) {\n        System.out.println(\"\u627e\u5230\u4e86\uff1a\" + element);\n        break;\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u4f7f\u7528 LinkedList \u4f5c\u4e3a\u961f\u5217\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 offer() \u65b9\u6cd5\u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u961f\u5217\u7684\u672b\u5c3e\uff0c\u4f7f\u7528 poll() \u65b9\u6cd5\u4ece\u961f\u5217\u7684\u5934\u90e8\u5220\u9664\u5143\u7d20\u3002\u53e6\u5916\uff0c\u7531\u4e8e LinkedList \u662f\u94fe\u8868\u7ed3\u6784\uff0c\u4e0d\u652f\u6301\u968f\u673a\u8bbf\u95ee\u5143\u7d20\uff0c\u56e0\u6b64\u4e0d\u80fd\u4f7f\u7528\u4e0b\u6807\u8bbf\u95ee\u5143\u7d20\uff0c\u9700\u8981\u4f7f\u7528\u8fed\u4ee3\u5668\u6216\u8005 poll() \u65b9\u6cd5\u4f9d\u6b21\u904d\u5386\u5143\u7d20\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/javabetter.cn\/collection\/gailan.html#_3-priorityqueue\">3\uff09PriorityQueue<\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">PriorityQueue \u662f\u4e00\u79cd\u4f18\u5148\u7ea7\u961f\u5217\uff0c\u5b83\u7684\u51fa\u961f\u987a\u5e8f\u4e0e\u5143\u7d20\u7684\u4f18\u5148\u7ea7\u6709\u5173\uff0c\u6267\u884c remove \u6216\u8005 poll \u65b9\u6cd5\uff0c\u8fd4\u56de\u7684\u603b\u662f\u4f18\u5148\u7ea7\u6700\u9ad8\u7684\u5143\u7d20\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521b\u5efa\u4e00\u4e2a PriorityQueue \u5bf9\u8c61\nPriorityQueue&lt;String> queue = new PriorityQueue&lt;>();\n\n\/\/ \u6dfb\u52a0\u5143\u7d20\nqueue.offer(\"\u6c89\u9ed8\");\nqueue.offer(\"\u738b\u4e8c\");\nqueue.offer(\"\u9648\u6e05\u626c\");\nSystem.out.println(queue); \/\/ \u8f93\u51fa &#91;\u6c89\u9ed8, \u738b\u4e8c, \u9648\u6e05\u626c]\n\n\/\/ \u5220\u9664\u5143\u7d20\nqueue.poll();\nSystem.out.println(queue); \/\/ \u8f93\u51fa &#91;\u738b\u4e8c, \u9648\u6e05\u626c]\n\n\/\/ \u4fee\u6539\u5143\u7d20\uff1aPriorityQueue \u4e0d\u652f\u6301\u76f4\u63a5\u4fee\u6539\u5143\u7d20\uff0c\u9700\u8981\u5148\u5220\u9664\u518d\u6dfb\u52a0\nString first = queue.poll();\nqueue.offer(\"\u5f20\u4e09\");\nSystem.out.println(queue); \/\/ \u8f93\u51fa &#91;\u5f20\u4e09, \u9648\u6e05\u626c]\n\n\/\/ \u67e5\u627e\u5143\u7d20\uff1aPriorityQueue \u4e0d\u652f\u6301\u968f\u673a\u8bbf\u95ee\u5143\u7d20\uff0c\u53ea\u80fd\u8bbf\u95ee\u961f\u9996\u5143\u7d20\nSystem.out.println(queue.peek()); \/\/ \u8f93\u51fa \u5f20\u4e09\nSystem.out.println(queue.contains(\"\u9648\u6e05\u626c\")); \/\/ \u8f93\u51fa true\n\n\/\/ \u901a\u8fc7 for \u5faa\u73af\u7684\u65b9\u5f0f\u67e5\u627e\u9648\u6e05\u626c\nfor (String element : queue) {\n    if (element.equals(\"\u9648\u6e05\u626c\")) {\n        System.out.println(\"\u627e\u5230\u4e86\uff1a\" + element);\n        break;\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8981\u60f3\u6709\u4f18\u5148\u7ea7\uff0c\u5143\u7d20\u5c31\u9700\u8981\u5b9e\u73b0&nbsp;<a href=\"https:\/\/javabetter.cn\/basic-extra-meal\/comparable-omparator.html\" target=\"_blank\" rel=\"noreferrer noopener\">Comparable \u63a5\u53e3\u6216\u8005 Comparator \u63a5\u53e3<\/a>\uff08\u6211\u4eec\u540e\u9762\u4f1a\u8bb2\uff09\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u5148\u6765\u4e00\u6bb5\u901a\u8fc7\u5b9e\u73b0 Comparator \u63a5\u53e3\u6309\u7167\u5e74\u9f84\u59d3\u540d\u6392\u5e8f\u7684\u4f18\u5148\u7ea7\u961f\u5217\u5427\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.Comparator;\nimport java.util.PriorityQueue;\n\nclass Student {\n    private String name;\n    private int chineseScore;\n    private int mathScore;\n\n    public Student(String name, int chineseScore, int mathScore) {\n        this.name = name;\n        this.chineseScore = chineseScore;\n        this.mathScore = mathScore;\n    }\n\n    public String getName() {\n        return name;\n    }\n\n    public int getChineseScore() {\n        return chineseScore;\n    }\n\n    public int getMathScore() {\n        return mathScore;\n    }\n\n    @Override\n    public String toString() {\n        return \"Student{\" +\n                \"name='\" + name + '\\'' +\n                \", \u603b\u6210\u7ee9=\" + (chineseScore + mathScore) +\n                '}';\n    }\n}\n\nclass StudentComparator implements Comparator&lt;Student> {\n    @Override\n    public int compare(Student s1, Student s2) {\n        \/\/ \u6bd4\u8f83\u603b\u6210\u7ee9\n        return Integer.compare(s2.getChineseScore() + s2.getMathScore(),\n                s1.getChineseScore() + s1.getMathScore());\n    }\n}\n\npublic class PriorityQueueComparatorExample {\n\n    public static void main(String&#91;] args) {\n        \/\/ \u521b\u5efa\u4e00\u4e2a\u6309\u7167\u603b\u6210\u7ee9\u6392\u5e8f\u7684\u4f18\u5148\u7ea7\u961f\u5217\n        PriorityQueue&lt;Student> queue = new PriorityQueue&lt;>(new StudentComparator());\n\n        \/\/ \u6dfb\u52a0\u5143\u7d20\n        queue.offer(new Student(\"\u738b\u4e8c\", 80, 90));\n        System.out.println(queue);\n        queue.offer(new Student(\"\u9648\u6e05\u626c\", 95, 95));\n        System.out.println(queue);\n        queue.offer(new Student(\"\u5c0f\u9a7c\u94c3\", 90, 95));\n        System.out.println(queue);\n        queue.offer(new Student(\"\u6c89\u9ed8\", 90, 80));\n        while (!queue.isEmpty()) {\n            System.out.print(queue.poll() + \" \");\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Student \u662f\u4e00\u4e2a\u5b66\u751f\u5bf9\u8c61\uff0c\u5305\u542b\u59d3\u540d\u3001\u8bed\u6587\u6210\u7ee9\u548c\u6570\u5b66\u6210\u7ee9\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">StudentComparator \u5b9e\u73b0\u4e86 Comparator \u63a5\u53e3\uff0c\u5bf9\u603b\u6210\u7ee9\u505a\u4e86\u4e00\u4e2a\u6392\u5e8f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PriorityQueue \u662f\u4e00\u4e2a\u4f18\u5148\u7ea7\u961f\u5217\uff0c\u53c2\u6570\u4e3a StudentComparator\uff0c\u7136\u540e\u6211\u4eec\u6dfb\u52a0\u4e86 4 \u4e2a\u5b66\u751f\u5bf9\u8c61\u8fdb\u53bb\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6765\u770b\u4e00\u4e0b\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;Student{name='\u738b\u4e8c', \u603b\u6210\u7ee9=170}]\n&#91;Student{name='\u9648\u6e05\u626c', \u603b\u6210\u7ee9=190}, Student{name='\u738b\u4e8c', \u603b\u6210\u7ee9=170}]\n&#91;Student{name='\u9648\u6e05\u626c', \u603b\u6210\u7ee9=190}, Student{name='\u738b\u4e8c', \u603b\u6210\u7ee9=170}, Student{name='\u5c0f\u9a7c\u94c3', \u603b\u6210\u7ee9=185}]\nStudent{name='\u9648\u6e05\u626c', \u603b\u6210\u7ee9=190} Student{name='\u5c0f\u9a7c\u94c3', \u603b\u6210\u7ee9=185} Student{name='\u6c89\u9ed8', \u603b\u6210\u7ee9=170} Student{name='\u738b\u4e8c', \u603b\u6210\u7ee9=170}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u4eec\u4f7f\u7528 offer \u65b9\u6cd5\u6dfb\u52a0\u5143\u7d20\uff0c\u6700\u540e\u7528 while \u5faa\u73af\u904d\u5386\u5143\u7d20\uff08\u901a\u8fc7 poll \u65b9\u6cd5\u53d6\u51fa\u5143\u7d20\uff09\uff0c\u4ece\u7ed3\u679c\u53ef\u4ee5\u770b\u5f97\u51fa\uff0c<a href=\"https:\/\/javabetter.cn\/collection\/PriorityQueue.html\" target=\"_blank\" rel=\"noreferrer noopener\">PriorityQueue<\/a>\u6309\u7167\u5b66\u751f\u7684\u603b\u6210\u7ee9\u7531\u9ad8\u5230\u4f4e\u8fdb\u884c\u4e86\u6392\u5e8f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/javabetter.cn\/collection\/gailan.html#_04%E3%80%81map\">04\u3001Map<\/a><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Map \u4fdd\u5b58\u7684\u662f\u952e\u503c\u5bf9\uff0c\u952e\u8981\u6c42\u4fdd\u6301\u552f\u4e00\u6027\uff0c\u503c\u53ef\u4ee5\u91cd\u590d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/javabetter.cn\/collection\/gailan.html#_1-hashmap\">1\uff09HashMap<\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">HashMap \u5b9e\u73b0\u4e86 Map \u63a5\u53e3\uff0c\u53ef\u4ee5\u6839\u636e\u952e\u5feb\u901f\u5730\u67e5\u627e\u5bf9\u5e94\u7684\u503c\u2014\u2014\u901a\u8fc7\u54c8\u5e0c\u51fd\u6570\u5c06\u952e\u6620\u5c04\u5230\u54c8\u5e0c\u8868\u4e2d\u7684\u4e00\u4e2a\u7d22\u5f15\u4f4d\u7f6e\uff0c\u4ece\u800c\u5b9e\u73b0\u5feb\u901f\u8bbf\u95ee\u3002<a href=\"https:\/\/javabetter.cn\/collection\/hashmap.html\" target=\"_blank\" rel=\"noreferrer noopener\">\u540e\u9762\u4f1a\u8be6\u7ec6\u804a\u5230<\/a>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u5148\u5927\u81f4\u4e86\u89e3\u4e00\u4e0b HashMap \u7684\u7279\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>HashMap \u4e2d\u7684\u952e\u548c\u503c\u90fd\u53ef\u4ee5\u4e3a null\u3002\u5982\u679c\u952e\u4e3a null\uff0c\u5219\u5c06\u8be5\u952e\u6620\u5c04\u5230\u54c8\u5e0c\u8868\u7684\u7b2c\u4e00\u4e2a\u4f4d\u7f6e\u3002<\/li>\n\n\n\n<li>\u53ef\u4ee5\u4f7f\u7528\u8fed\u4ee3\u5668\u6216\u8005 forEach \u65b9\u6cd5\u904d\u5386 HashMap \u4e2d\u7684\u952e\u503c\u5bf9\u3002<\/li>\n\n\n\n<li>HashMap \u6709\u4e00\u4e2a<strong>\u521d\u59cb\u5bb9\u91cf<\/strong>\u548c\u4e00\u4e2a<strong>\u8d1f\u8f7d\u56e0\u5b50<\/strong>\u3002\u521d\u59cb\u5bb9\u91cf\u662f\u6307\u54c8\u5e0c\u8868\u7684\u521d\u59cb\u5927\u5c0f\uff0c\u8d1f\u8f7d\u56e0\u5b50\u662f\u6307\u54c8\u5e0c\u8868\u5728\u6269\u5bb9\u4e4b\u524d\u53ef\u4ee5\u5b58\u50a8\u7684\u952e\u503c\u5bf9\u6570\u91cf\u4e0e\u54c8\u5e0c\u8868\u5927\u5c0f\u7684\u6bd4\u7387\u3002\u9ed8\u8ba4\u7684\u521d\u59cb\u5bb9\u91cf\u662f <strong>16<\/strong>\uff0c\u8d1f\u8f7d\u56e0\u5b50\u662f <strong>0.75<\/strong>\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u6765\u4e2a\u7b80\u5355\u7684\u589e\u5220\u6539\u67e5\u5427\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521b\u5efa\u4e00\u4e2a HashMap \u5bf9\u8c61\nHashMap&lt;String, String> hashMap = new HashMap&lt;>();\n\n\/\/ \u6dfb\u52a0\u952e\u503c\u5bf9\nhashMap.put(\"\u6c89\u9ed8\", \"cenzhong\");\nhashMap.put(\"\u738b\u4e8c\", \"wanger\");\nhashMap.put(\"\u9648\u6e05\u626c\", \"chenqingyang\");\n\n\/\/ \u83b7\u53d6\u6307\u5b9a\u952e\u7684\u503c\nString value1 = hashMap.get(\"\u6c89\u9ed8\");\nSystem.out.println(\"\u6c89\u9ed8\u5bf9\u5e94\u7684\u503c\u4e3a\uff1a\" + value1);\n\n\/\/ \u4fee\u6539\u952e\u5bf9\u5e94\u7684\u503c\nhashMap.put(\"\u6c89\u9ed8\", \"chenmo\");\nString value2 = hashMap.get(\"\u6c89\u9ed8\");\nSystem.out.println(\"\u4fee\u6539\u540e\u6c89\u9ed8\u5bf9\u5e94\u7684\u503c\u4e3a\uff1a\" + value2);\n\n\/\/ \u5220\u9664\u6307\u5b9a\u952e\u7684\u952e\u503c\u5bf9\nhashMap.remove(\"\u738b\u4e8c\");\n\n\/\/ \u904d\u5386 HashMap\nfor (String key : hashMap.keySet()) {\n    String value = hashMap.get(key);\n    System.out.println(key + \" \u5bf9\u5e94\u7684\u503c\u4e3a\uff1a\" + value);\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/javabetter.cn\/collection\/gailan.html#_2-linkedhashmap\">2\uff09LinkedHashMap<\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">HashMap \u5df2\u7ecf\u975e\u5e38\u5f3a\u5927\u4e86\uff0c\u4f46\u5b83\u662f<strong>\u65e0\u5e8f<\/strong>\u7684\u3002\u5982\u679c\u6211\u4eec\u9700\u8981\u4e00\u4e2a\u6709\u5e8f\u7684 Map\uff0c\u5c31\u8981\u7528\u5230\u00a0<a href=\"https:\/\/javabetter.cn\/collection\/linkedhashmap.html\" target=\"_blank\" rel=\"noreferrer noopener\">LinkedHashMap<\/a>\u3002LinkedHashMap \u662f HashMap \u7684\u5b50\u7c7b\uff0c\u5b83\u4f7f\u7528\u94fe\u8868\u6765\u8bb0\u5f55\u63d2\u5165\/\u8bbf\u95ee\u5143\u7d20\u7684\u987a\u5e8f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">LinkedHashMap \u53ef\u4ee5\u770b\u4f5c\u662f HashMap + LinkedList \u7684\u5408\u4f53\uff0c\u5b83\u4f7f\u7528\u4e86\u54c8\u5e0c\u8868\u6765\u5b58\u50a8\u6570\u636e\uff0c\u53c8\u7528\u4e86\u53cc\u5411\u94fe\u8868\u6765\u7ef4\u6301\u987a\u5e8f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6765\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521b\u5efa\u4e00\u4e2a LinkedHashMap\uff0c\u63d2\u5165\u7684\u952e\u503c\u5bf9\u4e3a \u6c89\u9ed8 \u738b\u4e8c \u9648\u6e05\u626c\nLinkedHashMap&lt;String, String> linkedHashMap = new LinkedHashMap&lt;>();\nlinkedHashMap.put(\"\u6c89\u9ed8\", \"cenzhong\");\nlinkedHashMap.put(\"\u738b\u4e8c\", \"wanger\");\nlinkedHashMap.put(\"\u9648\u6e05\u626c\", \"chenqingyang\");\n\n\/\/ \u904d\u5386 LinkedHashMap\nfor (String key : linkedHashMap.keySet()) {\n    String value = linkedHashMap.get(key);\n    System.out.println(key + \" \u5bf9\u5e94\u7684\u503c\u4e3a\uff1a\" + value);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6765\u770b\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u6c89\u9ed8 \u5bf9\u5e94\u7684\u503c\u4e3a\uff1acenzhong\n\u738b\u4e8c \u5bf9\u5e94\u7684\u503c\u4e3a\uff1awanger\n\u9648\u6e05\u626c \u5bf9\u5e94\u7684\u503c\u4e3a\uff1achenqingyang<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ece\u7ed3\u679c\u4e2d\u53ef\u4ee5\u770b\u5f97\u51fa\u6765\uff0cLinkedHashMap \u7ef4\u6301\u4e86\u952e\u503c\u5bf9\u7684\u63d2\u5165\u987a\u5e8f\uff0c\u5bf9\u5427\uff1f\u4e3a\u4e86\u548c LinkedHashMap \u505a\u5bf9\u6bd4\uff0c\u6211\u4eec\u7528\u540c\u6837\u7684\u6570\u636e\u8bd5\u9a8c\u4e00\u4e0b HashMap\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521b\u5efa\u4e00\u4e2aHashMap\uff0c\u63d2\u5165\u7684\u952e\u503c\u5bf9\u4e3a \u6c89\u9ed8 \u738b\u4e8c \u9648\u6e05\u626c\nHashMap&lt;String, String&gt; hashMap = new HashMap&lt;&gt;();\nhashMap.put(\"\u6c89\u9ed8\", \"cenzhong\");\nhashMap.put(\"\u738b\u4e8c\", \"wanger\");\nhashMap.put(\"\u9648\u6e05\u626c\", \"chenqingyang\");\n\n\/\/ \u904d\u5386 HashMap\nfor (String key : hashMap.keySet()) {\n    String value = hashMap.get(key);\n    System.out.println(key + \" \u5bf9\u5e94\u7684\u503c\u4e3a\uff1a\" + value);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6765\u770b\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u6c89\u9ed8 \u5bf9\u5e94\u7684\u503c\u4e3a\uff1acenzhong\n\u9648\u6e05\u626c \u5bf9\u5e94\u7684\u503c\u4e3a\uff1achenqingyang\n\u738b\u4e8c \u5bf9\u5e94\u7684\u503c\u4e3a\uff1awanger<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">HashMap \u6ca1\u6709\u7ef4\u6301\u952e\u503c\u5bf9\u7684\u63d2\u5165\u987a\u5e8f\uff0c\u5bf9\u5427\uff1f<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/javabetter.cn\/collection\/gailan.html#_3-treemap\">3\uff09TreeMap<\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/javabetter.cn\/collection\/treemap.html\" target=\"_blank\" rel=\"noreferrer noopener\">TreeMap<\/a>&nbsp;\u5b9e\u73b0\u4e86 SortedMap \u63a5\u53e3\uff0c\u53ef\u4ee5\u81ea\u52a8\u5c06\u952e\u6309\u7167\u81ea\u7136\u987a\u5e8f\u6216\u6307\u5b9a\u7684\u6bd4\u8f83\u5668\u987a\u5e8f\u6392\u5e8f\uff0c\u5e76\u4fdd\u8bc1\u5176\u5143\u7d20\u7684\u987a\u5e8f\u3002\u5185\u90e8\u4f7f\u7528\u7ea2\u9ed1\u6811\u6765\u5b9e\u73b0\u952e\u7684\u6392\u5e8f\u548c\u67e5\u627e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u540c\u6837\u6765\u4e00\u4e2a\u589e\u5220\u6539\u67e5\u7684 demo\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521b\u5efa\u4e00\u4e2a TreeMap \u5bf9\u8c61\nMap&lt;String, String> treeMap = new TreeMap&lt;>();\n\n\/\/ \u5411 TreeMap \u4e2d\u6dfb\u52a0\u952e\u503c\u5bf9\ntreeMap.put(\"\u6c89\u9ed8\", \"cenzhong\");\ntreeMap.put(\"\u738b\u4e8c\", \"wanger\");\ntreeMap.put(\"\u9648\u6e05\u626c\", \"chenqingyang\");\n\n\/\/ \u67e5\u627e\u952e\u503c\u5bf9\nString name = \"\u6c89\u9ed8\";\nif (treeMap.containsKey(name)) {\n    System.out.println(\"\u627e\u5230\u4e86 \" + name + \": \" + treeMap.get(name));\n} else {\n    System.out.println(\"\u6ca1\u6709\u627e\u5230 \" + name);\n}\n\n\/\/ \u4fee\u6539\u952e\u503c\u5bf9\nname = \"\u738b\u4e8c\";\nif (treeMap.containsKey(name)) {\n    System.out.println(\"\u4fee\u6539\u524d\u7684 \" + name + \": \" + treeMap.get(name));\n    treeMap.put(name, \"newWanger\");\n    System.out.println(\"\u4fee\u6539\u540e\u7684 \" + name + \": \" + treeMap.get(name));\n} else {\n    System.out.println(\"\u6ca1\u6709\u627e\u5230 \" + name);\n}\n\n\/\/ \u5220\u9664\u952e\u503c\u5bf9\nname = \"\u9648\u6e05\u626c\";\nif (treeMap.containsKey(name)) {\n    System.out.println(\"\u5220\u9664\u524d\u7684 \" + name + \": \" + treeMap.get(name));\n    treeMap.remove(name);\n    System.out.println(\"\u5220\u9664\u540e\u7684 \" + name + \": \" + treeMap.get(name));\n} else {\n    System.out.println(\"\u6ca1\u6709\u627e\u5230 \" + name);\n}\n\n\/\/ \u904d\u5386 TreeMap\nfor (Map.Entry&lt;String, String> entry : treeMap.entrySet()) {\n    System.out.println(entry.getKey() + \": \" + entry.getValue());\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0e HashMap \u4e0d\u540c\u7684\u662f\uff0cTreeMap \u4f1a\u6309\u7167<strong>\u952e\u7684\u987a\u5e8f<\/strong>\u6765\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521b\u5efa\u4e00\u4e2a TreeMap \u5bf9\u8c61\nMap&lt;String, String> treeMap = new TreeMap&lt;>();\n\n\/\/ \u5411 TreeMap \u4e2d\u6dfb\u52a0\u952e\u503c\u5bf9\ntreeMap.put(\"c\", \"cat\");\ntreeMap.put(\"a\", \"apple\");\ntreeMap.put(\"b\", \"banana\");\n\n\/\/ \u904d\u5386 TreeMap\nfor (Map.Entry&lt;String, String> entry : treeMap.entrySet()) {\n    System.out.println(entry.getKey() + \": \" + entry.getValue());\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6765\u770b\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>a: apple\nb: banana\nc: cat<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u5df2\u7ecf\u6309\u7167\u952e\u7684\u81ea\u7136\u987a\u5e8f\u6392\u8fc7\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u642c\u8fd0\u81eaJava\u96c6\u5408\u6846\u67b6\u5168\u9762\u89e3\u6790 | \u4e8c\u54e5\u7684Java\u8fdb\u9636\u4e4b\u8def Java \u96c6\u5408\u6846\u67b6\u53ef\u4ee5\u5206\u4e3a\u4e24\u6761\u5927\u7684\u652f\u7ebf\uff1a \u2460\u3001Co [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-2459","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/zero-zl.cn\/index.php\/wp-json\/wp\/v2\/posts\/2459","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zero-zl.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zero-zl.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zero-zl.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zero-zl.cn\/index.php\/wp-json\/wp\/v2\/comments?post=2459"}],"version-history":[{"count":4,"href":"https:\/\/zero-zl.cn\/index.php\/wp-json\/wp\/v2\/posts\/2459\/revisions"}],"predecessor-version":[{"id":2468,"href":"https:\/\/zero-zl.cn\/index.php\/wp-json\/wp\/v2\/posts\/2459\/revisions\/2468"}],"wp:attachment":[{"href":"https:\/\/zero-zl.cn\/index.php\/wp-json\/wp\/v2\/media?parent=2459"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zero-zl.cn\/index.php\/wp-json\/wp\/v2\/categories?post=2459"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zero-zl.cn\/index.php\/wp-json\/wp\/v2\/tags?post=2459"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}