{"id":54640,"date":"2025-08-13T09:19:53","date_gmt":"2025-08-13T01:19:53","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/54640.html"},"modified":"2025-08-13T09:19:53","modified_gmt":"2025-08-13T01:19:53","slug":"javaweb-30-%e5%a4%a9%e5%85%a5%e9%97%a8%ef%bc%9a%e7%ac%ac%e5%85%ab%e5%a4%a9-java-%e9%9b%86%e5%90%88%e6%a1%86%e6%9e%b6%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/54640.html","title":{"rendered":"JavaWeb 30 \u5929\u5165\u95e8\uff1a\u7b2c\u516b\u5929 \u2014\u2014Java \u96c6\u5408\u6846\u67b6\u8be6\u89e3"},"content":{"rendered":"<h2><\/h2>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728\u524d\u4e03\u5929\u7684\u5b66\u4e60\u4e2d&#xff0c;\u6211\u4eec\u638c\u63e1\u4e86 Java \u57fa\u7840\u8bed\u6cd5\u3001\u9762\u5411\u5bf9\u8c61\u7279\u6027\u3001\u5f02\u5e38\u5904\u7406\u7b49\u6838\u5fc3\u77e5\u8bc6\u3002\u4eca\u5929\u6211\u4eec\u5c06\u6df1\u5165\u5b66\u4e60Java \u96c6\u5408\u6846\u67b6&#xff08;Collection Framework&#xff09;\u2014\u2014 \u8fd9\u662f Java \u63d0\u4f9b\u7684\u4e00\u5957\u7528\u4e8e\u5b58\u50a8\u548c\u64cd\u4f5c\u591a\u4e2a\u6570\u636e\u7684\u5de5\u5177\u7c7b\u3002\u5728 JavaWeb \u5f00\u53d1\u4e2d&#xff0c;\u96c6\u5408\u6846\u67b6\u88ab\u5e7f\u6cdb\u7528\u4e8e\u5904\u7406\u6279\u91cf\u6570\u636e&#xff08;\u5982\u67e5\u8be2\u7ed3\u679c\u96c6\u3001\u8868\u5355\u63d0\u4ea4\u7684\u591a\u6761\u6570\u636e\u7b49&#xff09;&#xff0c;\u638c\u63e1\u5b83\u80fd\u6781\u5927\u63d0\u9ad8\u6570\u636e\u5904\u7406\u6548\u7387\u3002<\/p>\n<h3>\u4e3a\u4ec0\u4e48\u9700\u8981\u96c6\u5408\u6846\u67b6&#xff1f;<\/h3>\n<p>\u6570\u7ec4\u4f5c\u4e3a Java \u4e2d\u6700\u57fa\u7840\u7684\u6570\u636e\u5bb9\u5668&#xff0c;\u5b58\u5728\u8bf8\u591a\u5c40\u9650\u6027&#xff1a;<\/p>\n<ul>\n<li>\u957f\u5ea6\u56fa\u5b9a&#xff0c;\u65e0\u6cd5\u52a8\u6001\u6269\u5c55<\/li>\n<li>\u53ea\u80fd\u5b58\u50a8\u76f8\u540c\u7c7b\u578b\u7684\u5143\u7d20<\/li>\n<li>\u7f3a\u4e4f\u5e38\u7528\u64cd\u4f5c&#xff08;\u5982\u6dfb\u52a0\u3001\u5220\u9664\u3001\u67e5\u627e\u7b49&#xff09;\u7684\u5185\u7f6e\u65b9\u6cd5<\/li>\n<\/ul>\n<p>\u96c6\u5408\u6846\u67b6\u6b63\u662f\u4e3a\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\u800c\u8bbe\u8ba1\u7684&#xff0c;\u5b83\u5177\u6709&#xff1a;<\/p>\n<ul>\n<li>\u52a8\u6001\u6269\u5c55&#xff1a;\u53ef\u4ee5\u6839\u636e\u9700\u8981\u81ea\u52a8\u8c03\u6574\u5927\u5c0f<\/li>\n<li>\u4e30\u5bcc\u7684\u64cd\u4f5c&#xff1a;\u5185\u7f6e\u6dfb\u52a0\u3001\u5220\u9664\u3001\u67e5\u627e\u3001\u6392\u5e8f\u7b49\u65b9\u6cd5<\/li>\n<li>\u591a\u6570\u636e\u7ed3\u6784&#xff1a;\u63d0\u4f9b\u591a\u79cd\u6570\u636e\u7ed3\u6784&#xff08;\u5217\u8868\u3001\u96c6\u5408\u3001\u6620\u5c04\u7b49&#xff09;\u6ee1\u8db3\u4e0d\u540c\u9700\u6c42<\/li>\n<li>\u6cdb\u578b\u652f\u6301&#xff1a;\u7f16\u8bd1\u65f6\u7c7b\u578b\u68c0\u67e5&#xff0c;\u907f\u514d\u7c7b\u578b\u8f6c\u6362\u9519\u8bef<\/li>\n<\/ul>\n<h3>\u96c6\u5408\u6846\u67b6\u4f53\u7cfb\u7ed3\u6784<\/h3>\n<p>Java \u96c6\u5408\u6846\u67b6\u4e3b\u8981\u5206\u4e3a\u4e24\u5927\u4f53\u7cfb&#xff1a;<\/p>\n<li>\n<p>Collection \u63a5\u53e3&#xff1a;\u5b58\u50a8\u5355\u4e2a\u5143\u7d20\u7684\u96c6\u5408<\/p>\n<ul>\n<li>List&#xff1a;\u6709\u5e8f\u3001\u53ef\u91cd\u590d\u7684\u96c6\u5408&#xff08;\u5982ArrayList\u3001LinkedList&#xff09;<\/li>\n<li>Set&#xff1a;\u65e0\u5e8f\u3001\u4e0d\u53ef\u91cd\u590d\u7684\u96c6\u5408&#xff08;\u5982HashSet\u3001TreeSet&#xff09;<\/li>\n<li>Queue&#xff1a;\u961f\u5217&#xff08;\u5148\u8fdb\u5148\u51fa&#xff0c;\u5982LinkedList\u3001PriorityQueue&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>Map \u63a5\u53e3&#xff1a;\u5b58\u50a8\u952e\u503c\u5bf9&#xff08;key-value&#xff09;\u7684\u96c6\u5408&#xff08;\u5982HashMap\u3001TreeMap&#xff09;<\/p>\n<\/li>\n<p>\u4f53\u7cfb\u7ed3\u6784\u7b80\u56fe&#xff1a;<\/p>\n<p>java.util<br \/>\n\u251c\u2500 Collection&#xff08;\u63a5\u53e3&#xff09;<br \/>\n\u2502  \u251c\u2500 List&#xff08;\u63a5\u53e3&#xff09;<br \/>\n\u2502  \u2502  \u251c\u2500 ArrayList&#xff08;\u5b9e\u73b0\u7c7b&#xff09;<br \/>\n\u2502  \u2502  \u251c\u2500 LinkedList&#xff08;\u5b9e\u73b0\u7c7b&#xff09;<br \/>\n\u2502  \u2502  \u2514\u2500 Vector&#xff08;\u5b9e\u73b0\u7c7b&#xff0c;\u7ebf\u7a0b\u5b89\u5168&#xff09;<br \/>\n\u2502  \u2502<br \/>\n\u2502  \u251c\u2500 Set&#xff08;\u63a5\u53e3&#xff09;<br \/>\n\u2502  \u2502  \u251c\u2500 HashSet&#xff08;\u5b9e\u73b0\u7c7b&#xff09;<br \/>\n\u2502  \u2502  \u251c\u2500 TreeSet&#xff08;\u5b9e\u73b0\u7c7b&#xff0c;\u6709\u5e8f&#xff09;<br \/>\n\u2502  \u2502  \u2514\u2500 LinkedHashSet&#xff08;\u5b9e\u73b0\u7c7b&#xff0c;\u4fdd\u6301\u63d2\u5165\u987a\u5e8f&#xff09;<br \/>\n\u2502  \u2502<br \/>\n\u2502  \u2514\u2500 Queue&#xff08;\u63a5\u53e3&#xff09;<br \/>\n\u2502     \u2514\u2500 LinkedList&#xff08;\u5b9e\u73b0\u7c7b&#xff09;<br \/>\n\u2502<br \/>\n\u2514\u2500 Map&#xff08;\u63a5\u53e3&#xff09;<br \/>\n   \u251c\u2500 HashMap&#xff08;\u5b9e\u73b0\u7c7b&#xff09;<br \/>\n   \u251c\u2500 TreeMap&#xff08;\u5b9e\u73b0\u7c7b&#xff0c;\u6309\u952e\u6392\u5e8f&#xff09;<br \/>\n   \u251c\u2500 LinkedHashMap&#xff08;\u5b9e\u73b0\u7c7b&#xff0c;\u4fdd\u6301\u63d2\u5165\u987a\u5e8f&#xff09;<br \/>\n   \u2514\u2500 Hashtable&#xff08;\u5b9e\u73b0\u7c7b&#xff0c;\u7ebf\u7a0b\u5b89\u5168&#xff09;<\/p>\n<h3>\u6cdb\u578b&#xff1a;\u96c6\u5408\u7684\u7c7b\u578b\u5b89\u5168\u4fdd\u969c<\/h3>\n<p>\u5728 JDK 5 \u4e4b\u524d&#xff0c;\u96c6\u5408\u53ef\u4ee5\u5b58\u50a8\u4efb\u610f\u7c7b\u578b\u7684\u5bf9\u8c61&#xff0c;\u53d6\u51fa\u65f6\u9700\u8981\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362&#xff0c;\u5bb9\u6613\u51fa\u73b0ClassCastException\u3002\u6cdb\u578b&#xff08;Generic&#xff09;\u89e3\u51b3\u4e86\u8fd9\u4e2a\u95ee\u9898&#xff0c;\u5b83\u5141\u8bb8\u5728\u5b9a\u4e49\u96c6\u5408\u65f6\u6307\u5b9a\u5143\u7d20\u7c7b\u578b&#xff1a;<\/p>\n<p>\/\/ \u5b9a\u4e49\u6cdb\u578b\u96c6\u5408&#xff08;\u53ea\u80fd\u5b58\u50a8String\u7c7b\u578b&#xff09;<br \/>\nList&lt;String&gt; stringList &#061; new ArrayList&lt;String&gt;();<br \/>\n\/\/ JDK 7&#043;\u53ef\u4ee5\u7b80\u5316\u4e3a<br \/>\nList&lt;String&gt; stringList &#061; new ArrayList&lt;&gt;();<\/p>\n<p>\u6cdb\u578b\u7684\u4f18\u52bf&#xff1a;<\/p>\n<ul>\n<li>\u7f16\u8bd1\u65f6\u7c7b\u578b\u68c0\u67e5&#xff0c;\u907f\u514d\u7c7b\u578b\u9519\u8bef<\/li>\n<li>\u65e0\u9700\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362&#xff0c;\u4ee3\u7801\u66f4\u7b80\u6d01<\/li>\n<li>\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027<\/li>\n<\/ul>\n<h3>List \u63a5\u53e3&#xff1a;\u6709\u5e8f\u53ef\u91cd\u590d\u7684\u96c6\u5408<\/h3>\n<p>List\u63a5\u53e3\u662f Collection \u7684\u5b50\u63a5\u53e3&#xff0c;\u5177\u6709\u4ee5\u4e0b\u7279\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u5143\u7d20\u6709\u5e8f&#xff08;\u6309\u63d2\u5165\u987a\u5e8f\u6392\u5217&#xff09;<\/li>\n<li>\u5143\u7d20\u53ef\u91cd\u590d<\/li>\n<li>\u53ef\u4ee5\u901a\u8fc7\u7d22\u5f15\u8bbf\u95ee\u5143\u7d20&#xff08;\u7c7b\u4f3c\u6570\u7ec4&#xff09;<\/li>\n<\/ul>\n<h4>1. ArrayList&#xff1a;\u57fa\u4e8e\u52a8\u6001\u6570\u7ec4\u7684\u5b9e\u73b0<\/h4>\n<p>ArrayList\u662f\u6700\u5e38\u7528\u7684 List \u5b9e\u73b0\u7c7b&#xff0c;\u5e95\u5c42\u4f7f\u7528\u52a8\u6001\u6570\u7ec4\u5b58\u50a8\u5143\u7d20&#xff1a;<\/p>\n<p>import java.util.ArrayList;<br \/>\nimport java.util.List;<\/p>\n<p>public class ArrayListDemo {<br \/>\n    public static void main(String[] args) {<br \/>\n        \/\/ \u521b\u5efaArrayList&#xff08;\u5b58\u50a8String\u7c7b\u578b&#xff09;<br \/>\n        List&lt;String&gt; fruits &#061; new ArrayList&lt;&gt;();<\/p>\n<p>        \/\/ 1. \u6dfb\u52a0\u5143\u7d20<br \/>\n        fruits.add(&#034;\u82f9\u679c&#034;);<br \/>\n        fruits.add(&#034;\u9999\u8549&#034;);<br \/>\n        fruits.add(&#034;\u6a59\u5b50&#034;);<br \/>\n        fruits.add(1, &#034;\u8461\u8404&#034;); \/\/ \u5728\u7d22\u5f151\u5904\u63d2\u5165\u5143\u7d20<br \/>\n        System.out.println(&#034;\u6dfb\u52a0\u540e&#xff1a;&#034; &#043; fruits); \/\/ [\u82f9\u679c, \u8461\u8404, \u9999\u8549, \u6a59\u5b50]<\/p>\n<p>        \/\/ 2. \u83b7\u53d6\u5143\u7d20<br \/>\n        String first &#061; fruits.get(0);<br \/>\n        System.out.println(&#034;\u7b2c\u4e00\u4e2a\u5143\u7d20&#xff1a;&#034; &#043; first); \/\/ \u82f9\u679c<\/p>\n<p>        \/\/ 3. \u4fee\u6539\u5143\u7d20<br \/>\n        fruits.set(2, &#034;\u897f\u74dc&#034;);<br \/>\n        System.out.println(&#034;\u4fee\u6539\u540e&#xff1a;&#034; &#043; fruits); \/\/ [\u82f9\u679c, \u8461\u8404, \u897f\u74dc, \u6a59\u5b50]<\/p>\n<p>        \/\/ 4. \u5220\u9664\u5143\u7d20<br \/>\n        fruits.remove(3); \/\/ \u6309\u7d22\u5f15\u5220\u9664<br \/>\n        fruits.remove(&#034;\u8461\u8404&#034;); \/\/ \u6309\u5143\u7d20\u5220\u9664<br \/>\n        System.out.println(&#034;\u5220\u9664\u540e&#xff1a;&#034; &#043; fruits); \/\/ [\u82f9\u679c, \u897f\u74dc]<\/p>\n<p>        \/\/ 5. \u904d\u5386\u5143\u7d20<br \/>\n        System.out.println(&#034;\u904d\u5386\u5143\u7d20&#xff1a;&#034;);<br \/>\n        \/\/ \u65b9\u5f0f1&#xff1a;for\u5faa\u73af<br \/>\n        for (int i &#061; 0; i &lt; fruits.size(); i&#043;&#043;) {<br \/>\n            System.out.println(fruits.get(i));<br \/>\n        }<\/p>\n<p>        \/\/ \u65b9\u5f0f2&#xff1a;\u589e\u5f3afor\u5faa\u73af<br \/>\n        for (String fruit : fruits) {<br \/>\n            System.out.println(fruit);<br \/>\n        }<\/p>\n<p>        \/\/ 6. \u5176\u4ed6\u5e38\u7528\u65b9\u6cd5<br \/>\n        System.out.println(&#034;\u662f\u5426\u5305\u542b\u82f9\u679c&#xff1a;&#034; &#043; fruits.contains(&#034;\u82f9\u679c&#034;)); \/\/ true<br \/>\n        System.out.println(&#034;\u96c6\u5408\u5927\u5c0f&#xff1a;&#034; &#043; fruits.size()); \/\/ 2<br \/>\n        System.out.println(&#034;\u662f\u5426\u4e3a\u7a7a&#xff1a;&#034; &#043; fruits.isEmpty()); \/\/ false<\/p>\n<p>        \/\/ \u6e05\u7a7a\u96c6\u5408<br \/>\n        fruits.clear();<br \/>\n        System.out.println(&#034;\u6e05\u7a7a\u540e&#xff1a;&#034; &#043; fruits); \/\/ []<br \/>\n    }<br \/>\n}<\/p>\n<p>ArrayList\u7684\u7279\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u67e5\u627e\u548c\u4fee\u6539\u5feb&#xff08;\u901a\u8fc7\u7d22\u5f15\u76f4\u63a5\u8bbf\u95ee&#xff09;<\/li>\n<li>\u6dfb\u52a0\u548c\u5220\u9664\u6162&#xff08;\u9700\u8981\u79fb\u52a8\u5927\u91cf\u5143\u7d20&#xff09;<\/li>\n<li>\u521d\u59cb\u5bb9\u91cf\u4e3a 10&#xff0c;\u5f53\u5143\u7d20\u6ee1\u65f6\u81ea\u52a8\u6269\u5bb9\u4e3a\u539f\u6765\u7684 1.5 \u500d<\/li>\n<\/ul>\n<h4>2. LinkedList&#xff1a;\u57fa\u4e8e\u53cc\u5411\u94fe\u8868\u7684\u5b9e\u73b0<\/h4>\n<p>LinkedList\u5e95\u5c42\u4f7f\u7528\u53cc\u5411\u94fe\u8868\u5b58\u50a8\u5143\u7d20&#xff0c;\u9002\u5408\u9891\u7e41\u6dfb\u52a0\u548c\u5220\u9664\u7684\u573a\u666f&#xff1a;<\/p>\n<p>import java.util.LinkedList;<br \/>\nimport java.util.List;<\/p>\n<p>public class LinkedListDemo {<br \/>\n    public static void main(String[] args) {<br \/>\n        List&lt;Integer&gt; numbers &#061; new LinkedList&lt;&gt;();<\/p>\n<p>        \/\/ \u6dfb\u52a0\u5143\u7d20<br \/>\n        numbers.add(10);<br \/>\n        numbers.add(20);<br \/>\n        numbers.addFirst(5); \/\/ \u6dfb\u52a0\u5230\u5934\u90e8<br \/>\n        numbers.addLast(30); \/\/ \u6dfb\u52a0\u5230\u5c3e\u90e8<br \/>\n        System.out.println(&#034;LinkedList\u5185\u5bb9&#xff1a;&#034; &#043; numbers); \/\/ [5, 10, 20, 30]<\/p>\n<p>        \/\/ \u94fe\u8868\u7279\u6709\u7684\u65b9\u6cd5<br \/>\n        System.out.println(&#034;\u7b2c\u4e00\u4e2a\u5143\u7d20&#xff1a;&#034; &#043; numbers.getFirst()); \/\/ 5<br \/>\n        System.out.println(&#034;\u6700\u540e\u4e00\u4e2a\u5143\u7d20&#xff1a;&#034; &#043; numbers.getLast()); \/\/ 30<\/p>\n<p>        numbers.removeFirst(); \/\/ \u5220\u9664\u5934\u90e8\u5143\u7d20<br \/>\n        numbers.removeLast(); \/\/ \u5220\u9664\u5c3e\u90e8\u5143\u7d20<br \/>\n        System.out.println(&#034;\u64cd\u4f5c\u540e&#xff1a;&#034; &#043; numbers); \/\/ [10, 20]<\/p>\n<p>        \/\/ \u4f5c\u4e3a\u961f\u5217\u4f7f\u7528&#xff08;\u5148\u8fdb\u5148\u51fa&#xff09;<br \/>\n        LinkedList&lt;String&gt; queue &#061; new LinkedList&lt;&gt;();<br \/>\n        queue.offer(&#034;A&#034;); \/\/ \u5165\u961f<br \/>\n        queue.offer(&#034;B&#034;);<br \/>\n        queue.offer(&#034;C&#034;);<br \/>\n        System.out.println(&#034;\u51fa\u961f\u5143\u7d20&#xff1a;&#034; &#043; queue.poll()); \/\/ A<br \/>\n        System.out.println(&#034;\u961f\u5217\u5269\u4f59&#xff1a;&#034; &#043; queue); \/\/ [B, C]<br \/>\n    }<br \/>\n}<\/p>\n<p>LinkedList\u7684\u7279\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u6dfb\u52a0\u548c\u5220\u9664\u5feb&#xff08;\u53ea\u9700\u4fee\u6539\u6307\u9488\u6307\u5411&#xff09;<\/li>\n<li>\u67e5\u627e\u548c\u4fee\u6539\u6162&#xff08;\u9700\u8981\u4ece\u5934\u904d\u5386&#xff09;<\/li>\n<li>\u5b9e\u73b0\u4e86 Queue \u63a5\u53e3&#xff0c;\u53ef\u4f5c\u4e3a\u961f\u5217\u4f7f\u7528<\/li>\n<\/ul>\n<h4>3. ArrayList vs LinkedList \u5982\u4f55\u9009\u62e9&#xff1f;<\/h4>\n<table>\n<tr>\u573a\u666f\u63a8\u8350\u4f7f\u7528\u539f\u56e0<\/tr>\n<tbody>\n<tr>\n<td>\u9891\u7e41\u67e5\u8be2\u548c\u4fee\u6539<\/td>\n<td>ArrayList<\/td>\n<td>\u57fa\u4e8e\u6570\u7ec4&#xff0c;\u7d22\u5f15\u8bbf\u95ee\u6548\u7387\u9ad8<\/td>\n<\/tr>\n<tr>\n<td>\u9891\u7e41\u6dfb\u52a0\u548c\u5220\u9664<\/td>\n<td>LinkedList<\/td>\n<td>\u57fa\u4e8e\u94fe\u8868&#xff0c;\u64cd\u4f5c\u8282\u70b9\u6548\u7387\u9ad8<\/td>\n<\/tr>\n<tr>\n<td>\u5b58\u50a8\u5927\u91cf\u6570\u636e<\/td>\n<td>ArrayList<\/td>\n<td>\u5185\u5b58\u5360\u7528\u66f4\u7d27\u51d1<\/td>\n<\/tr>\n<tr>\n<td>\u9700\u8981\u4f5c\u4e3a\u961f\u5217\u4f7f\u7528<\/td>\n<td>LinkedList<\/td>\n<td>\u5b9e\u73b0\u4e86 Queue \u63a5\u53e3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Set \u63a5\u53e3&#xff1a;\u65e0\u5e8f\u4e0d\u53ef\u91cd\u590d\u7684\u96c6\u5408<\/h3>\n<p>Set\u63a5\u53e3\u662f Collection \u7684\u5b50\u63a5\u53e3&#xff0c;\u5177\u6709\u4ee5\u4e0b\u7279\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u5143\u7d20\u65e0\u5e8f&#xff08;\u5b58\u50a8\u987a\u5e8f\u548c\u53d6\u51fa\u987a\u5e8f\u53ef\u80fd\u4e0d\u540c&#xff09;<\/li>\n<li>\u5143\u7d20\u4e0d\u53ef\u91cd\u590d&#xff08;\u901a\u8fc7equals()\u65b9\u6cd5\u5224\u65ad&#xff09;<\/li>\n<li>\u6ca1\u6709\u7d22\u5f15&#xff0c;\u4e0d\u80fd\u901a\u8fc7\u7d22\u5f15\u8bbf\u95ee\u5143\u7d20<\/li>\n<\/ul>\n<h4>1. HashSet&#xff1a;\u57fa\u4e8e\u54c8\u5e0c\u8868\u7684\u5b9e\u73b0<\/h4>\n<p>HashSet\u662f\u6700\u5e38\u7528\u7684 Set \u5b9e\u73b0\u7c7b&#xff0c;\u5e95\u5c42\u57fa\u4e8e\u54c8\u5e0c\u8868&#xff08;HashMap&#xff09;\u5b9e\u73b0&#xff1a;<\/p>\n<p>import java.util.HashSet;<br \/>\nimport java.util.Set;<\/p>\n<p>public class HashSetDemo {<br \/>\n    public static void main(String[] args) {<br \/>\n        Set&lt;String&gt; cities &#061; new HashSet&lt;&gt;();<\/p>\n<p>        \/\/ \u6dfb\u52a0\u5143\u7d20&#xff08;\u81ea\u52a8\u53bb\u91cd&#xff09;<br \/>\n        cities.add(&#034;\u5317\u4eac&#034;);<br \/>\n        cities.add(&#034;\u4e0a\u6d77&#034;);<br \/>\n        cities.add(&#034;\u5e7f\u5dde&#034;);<br \/>\n        cities.add(&#034;\u5317\u4eac&#034;); \/\/ \u91cd\u590d\u5143\u7d20&#xff0c;\u6dfb\u52a0\u5931\u8d25<br \/>\n        System.out.println(&#034;HashSet\u5185\u5bb9&#xff1a;&#034; &#043; cities); \/\/ [\u4e0a\u6d77, \u5e7f\u5dde, \u5317\u4eac]&#xff08;\u987a\u5e8f\u4e0d\u786e\u5b9a&#xff09;<\/p>\n<p>        \/\/ \u5220\u9664\u5143\u7d20<br \/>\n        cities.remove(&#034;\u5e7f\u5dde&#034;);<br \/>\n        System.out.println(&#034;\u5220\u9664\u540e&#xff1a;&#034; &#043; cities); \/\/ [\u4e0a\u6d77, \u5317\u4eac]<\/p>\n<p>        \/\/ \u904d\u5386\u5143\u7d20&#xff08;\u6ca1\u6709\u7d22\u5f15&#xff0c;\u4e0d\u80fd\u7528\u666e\u901afor\u5faa\u73af&#xff09;<br \/>\n        System.out.println(&#034;\u904d\u5386\u5143\u7d20&#xff1a;&#034;);<br \/>\n        for (String city : cities) {<br \/>\n            System.out.println(city);<br \/>\n        }<\/p>\n<p>        \/\/ \u5176\u4ed6\u5e38\u7528\u65b9\u6cd5<br \/>\n        System.out.println(&#034;\u662f\u5426\u5305\u542b\u4e0a\u6d77&#xff1a;&#034; &#043; cities.contains(&#034;\u4e0a\u6d77&#034;)); \/\/ true<br \/>\n        System.out.println(&#034;\u96c6\u5408\u5927\u5c0f&#xff1a;&#034; &#043; cities.size()); \/\/ 2<br \/>\n    }<br \/>\n}<\/p>\n<p>HashSet\u53bb\u91cd\u539f\u7406&#xff1a;<\/p>\n<li>\u8ba1\u7b97\u5143\u7d20\u7684\u54c8\u5e0c\u503c&#xff08;hashCode()\u65b9\u6cd5&#xff09;<\/li>\n<li>\u82e5\u54c8\u5e0c\u503c\u4e0d\u540c&#xff0c;\u76f4\u63a5\u5b58\u50a8<\/li>\n<li>\u82e5\u54c8\u5e0c\u503c\u76f8\u540c&#xff0c;\u901a\u8fc7equals()\u65b9\u6cd5\u5224\u65ad\u662f\u5426\u771f\u7684\u76f8\u540c<\/li>\n<li>\u4e24\u8005\u90fd\u76f8\u540c\u5219\u89c6\u4e3a\u91cd\u590d\u5143\u7d20&#xff0c;\u4e0d\u5b58\u50a8<\/li>\n<p>\u6ce8\u610f&#xff1a;\u81ea\u5b9a\u4e49\u7c7b\u5b58\u50a8\u5230 HashSet \u65f6&#xff0c;\u5fc5\u987b\u91cd\u5199hashCode()\u548cequals()\u65b9\u6cd5&#xff0c;\u5426\u5219\u65e0\u6cd5\u6b63\u786e\u53bb\u91cd&#xff1a;<\/p>\n<p>import java.util.Objects;<\/p>\n<p>public class Student {<br \/>\n    private String id;<br \/>\n    private String name;<\/p>\n<p>    \/\/ \u6784\u9020\u65b9\u6cd5\u3001getter\u3001setter\u7701\u7565<\/p>\n<p>    \/\/ \u91cd\u5199hashCode\u548cequals<br \/>\n    &#064;Override<br \/>\n    public boolean equals(Object o) {<br \/>\n        if (this &#061;&#061; o) return true;<br \/>\n        if (o &#061;&#061; null || getClass() !&#061; o.getClass()) return false;<br \/>\n        Student student &#061; (Student) o;<br \/>\n        return Objects.equals(id, student.id); \/\/ \u6309\u5b66\u53f7\u5224\u65ad\u662f\u5426\u76f8\u540c<br \/>\n    }<\/p>\n<p>    &#064;Override<br \/>\n    public int hashCode() {<br \/>\n        return Objects.hash(id); \/\/ \u57fa\u4e8e\u5b66\u53f7\u8ba1\u7b97\u54c8\u5e0c\u503c<br \/>\n    }<br \/>\n}<\/p>\n<h4>2. TreeSet&#xff1a;\u6709\u5e8f\u7684 Set \u96c6\u5408<\/h4>\n<p>TreeSet\u5e95\u5c42\u57fa\u4e8e\u7ea2\u9ed1\u6811\u5b9e\u73b0&#xff0c;\u80fd\u591f\u5bf9\u5143\u7d20\u8fdb\u884c\u6392\u5e8f&#xff1a;<\/p>\n<p>import java.util.Set;<br \/>\nimport java.util.TreeSet;<\/p>\n<p>public class TreeSetDemo {<br \/>\n    public static void main(String[] args) {<br \/>\n        \/\/ \u5b58\u50a8\u6574\u6570&#xff08;\u81ea\u52a8\u6392\u5e8f&#xff09;<br \/>\n        Set&lt;Integer&gt; nums &#061; new TreeSet&lt;&gt;();<br \/>\n        nums.add(30);<br \/>\n        nums.add(10);<br \/>\n        nums.add(20);<br \/>\n        nums.add(10); \/\/ \u91cd\u590d\u5143\u7d20&#xff0c;\u4e0d\u5b58\u50a8<br \/>\n        System.out.println(&#034;\u6392\u5e8f\u540e\u7684\u6574\u6570&#xff1a;&#034; &#043; nums); \/\/ [10, 20, 30]<\/p>\n<p>        \/\/ \u5b58\u50a8\u5b57\u7b26\u4e32&#xff08;\u6309\u81ea\u7136\u987a\u5e8f\u6392\u5e8f&#xff09;<br \/>\n        Set&lt;String&gt; words &#061; new TreeSet&lt;&gt;();<br \/>\n        words.add(&#034;banana&#034;);<br \/>\n        words.add(&#034;apple&#034;);<br \/>\n        words.add(&#034;cherry&#034;);<br \/>\n        System.out.println(&#034;\u6392\u5e8f\u540e\u7684\u5b57\u7b26\u4e32&#xff1a;&#034; &#043; words); \/\/ [apple, banana, cherry]<br \/>\n    }<br \/>\n}<\/p>\n<p>TreeSet\u6392\u5e8f\u65b9\u5f0f&#xff1a;<\/p>\n<ul>\n<li>\u81ea\u7136\u6392\u5e8f&#xff1a;\u5143\u7d20\u5b9e\u73b0Comparable\u63a5\u53e3&#xff0c;\u91cd\u5199compareTo()\u65b9\u6cd5<\/li>\n<li>\u5b9a\u5236\u6392\u5e8f&#xff1a;\u521b\u5efa TreeSet \u65f6\u4f20\u5165Comparator\u6bd4\u8f83\u5668<\/li>\n<\/ul>\n<p>\u5b9e\u4f8b&#xff1a;\u81ea\u5b9a\u4e49\u5bf9\u8c61\u7684 TreeSet \u6392\u5e8f<\/p>\n<p>import java.util.Set;<br \/>\nimport java.util.TreeSet;<\/p>\n<p>\/\/ \u5b66\u751f\u7c7b\u5b9e\u73b0Comparable\u63a5\u53e3<br \/>\nclass Student implements Comparable&lt;Student&gt; {<br \/>\n    private String name;<br \/>\n    private int age;<\/p>\n<p>    public Student(String name, int age) {<br \/>\n        this.name &#061; name;<br \/>\n        this.age &#061; age;<br \/>\n    }<\/p>\n<p>    \/\/ \u6309\u5e74\u9f84\u6392\u5e8f<br \/>\n    &#064;Override<br \/>\n    public int compareTo(Student o) {<br \/>\n        return this.age &#8211; o.age; \/\/ \u6b63\u6570&#xff1a;\u5f53\u524d\u5bf9\u8c61\u5927&#xff1b;\u8d1f\u6570&#xff1a;\u5f53\u524d\u5bf9\u8c61\u5c0f&#xff1b;0&#xff1a;\u76f8\u7b49<br \/>\n    }<\/p>\n<p>    &#064;Override<br \/>\n    public String toString() {<br \/>\n        return name &#043; &#034;(&#034; &#043; age &#043; &#034;)&#034;;<br \/>\n    }<br \/>\n}<\/p>\n<p>public class TreeSetCustomSort {<br \/>\n    public static void main(String[] args) {<br \/>\n        Set&lt;Student&gt; students &#061; new TreeSet&lt;&gt;();<br \/>\n        students.add(new Student(&#034;\u5f20\u4e09&#034;, 20));<br \/>\n        students.add(new Student(&#034;\u674e\u56db&#034;, 18));<br \/>\n        students.add(new Student(&#034;\u738b\u4e94&#034;, 22));<\/p>\n<p>        System.out.println(&#034;\u6309\u5e74\u9f84\u6392\u5e8f&#xff1a;&#034; &#043; students); \/\/ [\u674e\u56db(18), \u5f20\u4e09(20), \u738b\u4e94(22)]<br \/>\n    }<br \/>\n}<\/p>\n<h3>Map \u63a5\u53e3&#xff1a;\u952e\u503c\u5bf9\u96c6\u5408<\/h3>\n<p>Map\u63a5\u53e3\u7528\u4e8e\u5b58\u50a8\u952e\u503c\u5bf9&#xff08;key-value&#xff09;\u6620\u5c04&#xff0c;\u5177\u6709\u4ee5\u4e0b\u7279\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u952e&#xff08;key&#xff09;\u4e0d\u53ef\u91cd\u590d&#xff0c;\u503c&#xff08;value&#xff09;\u53ef\u4ee5\u91cd\u590d<\/li>\n<li>\u6bcf\u4e2a\u952e\u5bf9\u5e94\u4e00\u4e2a\u503c&#xff0c;\u901a\u8fc7\u952e\u53ef\u4ee5\u5feb\u901f\u67e5\u627e\u503c<\/li>\n<li>\u5e38\u7528\u5b9e\u73b0\u7c7b&#xff1a;HashMap\u3001TreeMap\u3001LinkedHashMap<\/li>\n<\/ul>\n<h4>1. HashMap&#xff1a;\u57fa\u4e8e\u54c8\u5e0c\u8868\u7684\u5b9e\u73b0<\/h4>\n<p>HashMap\u662f\u6700\u5e38\u7528\u7684 Map \u5b9e\u73b0\u7c7b&#xff0c;\u5e95\u5c42\u57fa\u4e8e\u54c8\u5e0c\u8868\u5b9e\u73b0&#xff1a;<\/p>\n<p>import java.util.HashMap;<br \/>\nimport java.util.Map;<br \/>\nimport java.util.Set;<\/p>\n<p>public class HashMapDemo {<br \/>\n    public static void main(String[] args) {<br \/>\n        \/\/ \u521b\u5efaHashMap&#xff08;\u952e&#xff1a;String&#xff0c;\u503c&#xff1a;Integer&#xff09;<br \/>\n        Map&lt;String, Integer&gt; scores &#061; new HashMap&lt;&gt;();<\/p>\n<p>        \/\/ 1. \u6dfb\u52a0\u952e\u503c\u5bf9<br \/>\n        scores.put(&#034;\u5f20\u4e09&#034;, 90);<br \/>\n        scores.put(&#034;\u674e\u56db&#034;, 85);<br \/>\n        scores.put(&#034;\u738b\u4e94&#034;, 95);<br \/>\n        scores.put(&#034;\u5f20\u4e09&#034;, 92); \/\/ \u952e\u76f8\u540c&#xff0c;\u8986\u76d6\u503c<br \/>\n        System.out.println(&#034;HashMap\u5185\u5bb9&#xff1a;&#034; &#043; scores); \/\/ {\u674e\u56db&#061;85, \u5f20\u4e09&#061;92, \u738b\u4e94&#061;95}&#xff08;\u987a\u5e8f\u4e0d\u786e\u5b9a&#xff09;<\/p>\n<p>        \/\/ 2. \u83b7\u53d6\u503c<br \/>\n        int zhangSanScore &#061; scores.get(&#034;\u5f20\u4e09&#034;);<br \/>\n        System.out.println(&#034;\u5f20\u4e09\u7684\u5206\u6570&#xff1a;&#034; &#043; zhangSanScore); \/\/ 92<\/p>\n<p>        \/\/ 3. \u5224\u65ad\u662f\u5426\u5305\u542b\u952e\/\u503c<br \/>\n        System.out.println(&#034;\u662f\u5426\u5305\u542b\u674e\u56db&#xff1a;&#034; &#043; scores.containsKey(&#034;\u674e\u56db&#034;)); \/\/ true<br \/>\n        System.out.println(&#034;\u662f\u5426\u5305\u542b100\u5206&#xff1a;&#034; &#043; scores.containsValue(100)); \/\/ false<\/p>\n<p>        \/\/ 4. \u5220\u9664\u952e\u503c\u5bf9<br \/>\n        scores.remove(&#034;\u738b\u4e94&#034;);<br \/>\n        System.out.println(&#034;\u5220\u9664\u540e&#xff1a;&#034; &#043; scores); \/\/ {\u674e\u56db&#061;85, \u5f20\u4e09&#061;92}<\/p>\n<p>        \/\/ 5. \u904d\u5386Map<br \/>\n        System.out.println(&#034;\u904d\u5386\u952e&#xff1a;&#034;);<br \/>\n        Set&lt;String&gt; keys &#061; scores.keySet(); \/\/ \u83b7\u53d6\u6240\u6709\u952e<br \/>\n        for (String key : keys) {<br \/>\n            System.out.println(key &#043; &#034;&#xff1a;&#034; &#043; scores.get(key));<br \/>\n        }<\/p>\n<p>        System.out.println(&#034;\u904d\u5386\u952e\u503c\u5bf9&#xff1a;&#034;);<br \/>\n        Set&lt;Map.Entry&lt;String, Integer&gt;&gt; entries &#061; scores.entrySet(); \/\/ \u83b7\u53d6\u6240\u6709\u952e\u503c\u5bf9<br \/>\n        for (Map.Entry&lt;String, Integer&gt; entry : entries) {<br \/>\n            System.out.println(entry.getKey() &#043; &#034;&#xff1a;&#034; &#043; entry.getValue());<br \/>\n        }<\/p>\n<p>        \/\/ 6. \u5176\u4ed6\u5e38\u7528\u65b9\u6cd5<br \/>\n        System.out.println(&#034;\u96c6\u5408\u5927\u5c0f&#xff1a;&#034; &#043; scores.size()); \/\/ 2<br \/>\n        scores.clear(); \/\/ \u6e05\u7a7a\u96c6\u5408<br \/>\n        System.out.println(&#034;\u6e05\u7a7a\u540e&#xff1a;&#034; &#043; scores); \/\/ {}<br \/>\n    }<br \/>\n}<\/p>\n<p>HashMap\u7684\u7279\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u67e5\u627e\u3001\u6dfb\u52a0\u3001\u5220\u9664\u6548\u7387\u9ad8&#xff08;\u57fa\u4e8e\u54c8\u5e0c\u8868&#xff09;<\/li>\n<li>\u952e\u65e0\u5e8f&#xff08;\u5b58\u50a8\u987a\u5e8f\u548c\u53d6\u51fa\u987a\u5e8f\u53ef\u80fd\u4e0d\u540c&#xff09;<\/li>\n<li>\u952e\u53ef\u4ee5\u4e3a null&#xff08;\u4f46\u53ea\u80fd\u6709\u4e00\u4e2a null \u952e&#xff09;<\/li>\n<li>JDK 8 &#043; \u4e2d&#xff0c;\u5f53\u94fe\u8868\u957f\u5ea6\u8d85\u8fc7 8 \u65f6&#xff0c;\u4f1a\u8f6c\u4e3a\u7ea2\u9ed1\u6811\u63d0\u9ad8\u6027\u80fd<\/li>\n<\/ul>\n<h4>2. TreeMap&#xff1a;\u6709\u5e8f\u7684 Map \u96c6\u5408<\/h4>\n<p>TreeMap\u5e95\u5c42\u57fa\u4e8e\u7ea2\u9ed1\u6811\u5b9e\u73b0&#xff0c;\u80fd\u591f\u6309\u952e\u8fdb\u884c\u6392\u5e8f&#xff1a;<\/p>\n<p>import java.util.Map;<br \/>\nimport java.util.TreeMap;<\/p>\n<p>public class TreeMapDemo {<br \/>\n    public static void main(String[] args) {<br \/>\n        \/\/ TreeMap\u4f1a\u81ea\u52a8\u6309\u952e\u6392\u5e8f<br \/>\n        Map&lt;String, String&gt; dictionary &#061; new TreeMap&lt;&gt;();<br \/>\n        dictionary.put(&#034;banana&#034;, &#034;\u9999\u8549&#034;);<br \/>\n        dictionary.put(&#034;apple&#034;, &#034;\u82f9\u679c&#034;);<br \/>\n        dictionary.put(&#034;cherry&#034;, &#034;\u6a31\u6843&#034;);<\/p>\n<p>        System.out.println(&#034;\u6309\u952e\u6392\u5e8f&#xff1a;&#034; &#043; dictionary);<br \/>\n        \/\/ \u8f93\u51fa&#xff1a;{apple&#061;\u82f9\u679c, banana&#061;\u9999\u8549, cherry&#061;\u6a31\u6843}<br \/>\n    }<br \/>\n}<\/p>\n<h4>3. LinkedHashMap&#xff1a;\u4fdd\u6301\u63d2\u5165\u987a\u5e8f\u7684 Map<\/h4>\n<p>LinkedHashMap\u662fHashMap\u7684\u5b50\u7c7b&#xff0c;\u80fd\u591f\u4fdd\u6301\u952e\u503c\u5bf9\u7684\u63d2\u5165\u987a\u5e8f&#xff1a;<\/p>\n<p>import java.util.LinkedHashMap;<br \/>\nimport java.util.Map;<\/p>\n<p>public class LinkedHashMapDemo {<br \/>\n    public static void main(String[] args) {<br \/>\n        Map&lt;String, Integer&gt; map &#061; new LinkedHashMap&lt;&gt;();<br \/>\n        map.put(&#034;\u5f20\u4e09&#034;, 20);<br \/>\n        map.put(&#034;\u674e\u56db&#034;, 18);<br \/>\n        map.put(&#034;\u738b\u4e94&#034;, 22);<\/p>\n<p>        \/\/ \u8f93\u51fa\u987a\u5e8f\u4e0e\u63d2\u5165\u987a\u5e8f\u4e00\u81f4<br \/>\n        System.out.println(&#034;LinkedHashMap\u5185\u5bb9&#xff1a;&#034; &#043; map);<br \/>\n        \/\/ \u8f93\u51fa&#xff1a;{\u5f20\u4e09&#061;20, \u674e\u56db&#061;18, \u738b\u4e94&#061;22}<br \/>\n    }<br \/>\n}<\/p>\n<h3>\u96c6\u5408\u5de5\u5177\u7c7b&#xff1a;Collections<\/h3>\n<p>java.util.Collections\u7c7b\u63d0\u4f9b\u4e86\u5927\u91cf\u9759\u6001\u65b9\u6cd5&#xff0c;\u7528\u4e8e\u64cd\u4f5c\u96c6\u5408&#xff1a;<\/p>\n<p>import java.util.ArrayList;<br \/>\nimport java.util.Collections;<br \/>\nimport java.util.List;<\/p>\n<p>public class CollectionsDemo {<br \/>\n    public static void main(String[] args) {<br \/>\n        List&lt;Integer&gt; list &#061; new ArrayList&lt;&gt;();<br \/>\n        list.add(3);<br \/>\n        list.add(1);<br \/>\n        list.add(2);<\/p>\n<p>        \/\/ \u6392\u5e8f<br \/>\n        Collections.sort(list);<br \/>\n        System.out.println(&#034;\u6392\u5e8f\u540e&#xff1a;&#034; &#043; list); \/\/ [1, 2, 3]<\/p>\n<p>        \/\/ \u53cd\u8f6c<br \/>\n        Collections.reverse(list);<br \/>\n        System.out.println(&#034;\u53cd\u8f6c\u540e&#xff1a;&#034; &#043; list); \/\/ [3, 2, 1]<\/p>\n<p>        \/\/ \u67e5\u627e\u6700\u5927\u503c<br \/>\n        int max &#061; Collections.max(list);<br \/>\n        System.out.println(&#034;\u6700\u5927\u503c&#xff1a;&#034; &#043; max); \/\/ 3<\/p>\n<p>        \/\/ \u586b\u5145<br \/>\n        Collections.fill(list, 0);<br \/>\n        System.out.println(&#034;\u586b\u5145\u540e&#xff1a;&#034; &#043; list); \/\/ [0, 0, 0]<\/p>\n<p>        \/\/ \u7ebf\u7a0b\u5b89\u5168\u7684\u96c6\u5408<br \/>\n        List&lt;Integer&gt; synchronizedList &#061; Collections.synchronizedList(new ArrayList&lt;&gt;());<br \/>\n    }<br \/>\n}<\/p>\n<h3>\u96c6\u5408\u6846\u67b6\u5728 JavaWeb \u4e2d\u7684\u5e94\u7528<\/h3>\n<p>\u5728 JavaWeb \u5f00\u53d1\u4e2d&#xff0c;\u96c6\u5408\u6846\u67b6\u7684\u5e94\u7528\u975e\u5e38\u5e7f\u6cdb&#xff1a;<\/p>\n<li>\n<p>\u5904\u7406\u8868\u5355\u63d0\u4ea4\u7684\u6279\u91cf\u6570\u636e&#xff1a;<\/p>\n<p>\/\/ Servlet\u4e2d\u83b7\u53d6\u591a\u9009\u6846\u6570\u636e<br \/>\nString[] hobbies &#061; request.getParameterValues(&#034;hobby&#034;);<br \/>\nList&lt;String&gt; hobbyList &#061; Arrays.asList(hobbies); \/\/ \u6570\u7ec4\u8f6c\u96c6\u5408<\/p>\n<\/li>\n<li>\n<p>\u5b58\u50a8\u6570\u636e\u5e93\u67e5\u8be2\u7ed3\u679c&#xff1a;<\/p>\n<p>\/\/ \u67e5\u8be2\u6240\u6709\u7528\u6237<br \/>\nList&lt;User&gt; userList &#061; new ArrayList&lt;&gt;();<br \/>\nwhile (rs.next()) {<br \/>\n    User user &#061; new User();<br \/>\n    user.setId(rs.getInt(&#034;id&#034;));<br \/>\n    user.setName(rs.getString(&#034;name&#034;));<br \/>\n    userList.add(user);<br \/>\n}<br \/>\nrequest.setAttribute(&#034;users&#034;, userList); \/\/ \u5b58\u5165\u8bf7\u6c42\u57df<\/p>\n<\/li>\n<li>\n<p>\u5904\u7406 JSON \u6570\u636e&#xff1a;<br \/>\n\u524d\u540e\u7aef\u4ea4\u4e92\u7684 JSON \u6570\u7ec4\u901a\u5e38\u4f1a\u8f6c\u6362\u4e3a Java \u96c6\u5408\u8fdb\u884c\u5904\u7406<\/p>\n<\/li>\n<h3>\u603b\u7ed3\u4e0e\u5b9e\u8df5<\/h3>\n<h4>\u77e5\u8bc6\u70b9\u56de\u987e<\/h4>\n<li>\n<p>\u96c6\u5408\u6846\u67b6\u4f53\u7cfb&#xff1a;<\/p>\n<ul>\n<li>Collection&#xff1a;\u5b58\u50a8\u5355\u4e2a\u5143\u7d20&#xff08;List \u6709\u5e8f\u53ef\u91cd\u590d&#xff0c;Set \u65e0\u5e8f\u4e0d\u53ef\u91cd\u590d&#xff09;<\/li>\n<li>Map&#xff1a;\u5b58\u50a8\u952e\u503c\u5bf9&#xff08;key-value&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5e38\u7528\u5b9e\u73b0\u7c7b&#xff1a;<\/p>\n<ul>\n<li>List&#xff1a;ArrayList&#xff08;\u6570\u7ec4\u5b9e\u73b0&#xff0c;\u67e5\u8be2\u5feb&#xff09;\u3001LinkedList&#xff08;\u94fe\u8868\u5b9e\u73b0&#xff0c;\u589e\u5220\u5feb&#xff09;<\/li>\n<li>Set&#xff1a;HashSet&#xff08;\u54c8\u5e0c\u8868&#xff0c;\u53bb\u91cd&#xff09;\u3001TreeSet&#xff08;\u7ea2\u9ed1\u6811&#xff0c;\u6392\u5e8f&#xff09;<\/li>\n<li>Map&#xff1a;HashMap&#xff08;\u54c8\u5e0c\u8868&#xff0c;\u5e38\u7528&#xff09;\u3001TreeMap&#xff08;\u6392\u5e8f&#xff09;\u3001LinkedHashMap&#xff08;\u4fdd\u6301\u987a\u5e8f&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u6cdb\u578b&#xff1a;\u5b9a\u4e49\u96c6\u5408\u65f6\u6307\u5b9a\u5143\u7d20\u7c7b\u578b&#xff0c;\u786e\u4fdd\u7c7b\u578b\u5b89\u5168<\/p>\n<\/li>\n<li>\n<p>Collections \u5de5\u5177\u7c7b&#xff1a;\u63d0\u4f9b\u6392\u5e8f\u3001\u67e5\u627e\u7b49\u96c6\u5408\u64cd\u4f5c\u65b9\u6cd5<\/p>\n<\/li>\n<h4>\u5b9e\u8df5\u4efb\u52a1<\/h4>\n<li>\n<p>\u5b66\u751f\u6210\u7ee9\u7ba1\u7406\u7cfb\u7edf&#xff1a;<\/p>\n<ul>\n<li>\u521b\u5efaStudent\u7c7b&#xff08;\u5305\u542b\u59d3\u540d\u3001\u5b66\u53f7\u3001\u6210\u7ee9&#xff09;<\/li>\n<li>\u4f7f\u7528ArrayList\u5b58\u50a8\u591a\u4e2a\u5b66\u751f\u5bf9\u8c61<\/li>\n<li>\u5b9e\u73b0\u529f\u80fd&#xff1a;\u6dfb\u52a0\u5b66\u751f\u3001\u5220\u9664\u5b66\u751f\u3001\u4fee\u6539\u6210\u7ee9\u3001\u6309\u6210\u7ee9\u6392\u5e8f\u3001\u67e5\u8be2\u5e73\u5747\u5206<\/li>\n<li>\u4f7f\u7528HashMap\u7edf\u8ba1\u5404\u5206\u6570\u6bb5\u7684\u5b66\u751f\u6570\u91cf&#xff08;\u5982 90-100 \u5206\u300180-89 \u5206\u7b49&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u53bb\u91cd\u4e0e\u6392\u5e8f\u7ec3\u4e60&#xff1a;<\/p>\n<ul>\n<li>\u5b9a\u4e49\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4&#xff1a;{&#034;apple&#034;, &#034;banana&#034;, &#034;apple&#034;, &#034;orange&#034;, &#034;banana&#034;}<\/li>\n<li>\u4f7f\u7528HashSet\u5bf9\u6570\u7ec4\u53bb\u91cd<\/li>\n<li>\u5c06\u53bb\u91cd\u540e\u7684\u7ed3\u679c\u8f6c\u6362\u4e3aTreeSet&#xff0c;\u5b9e\u73b0\u6309\u5b57\u6bcd\u987a\u5e8f\u6392\u5e8f<\/li>\n<li>\u8f93\u51fa\u6700\u7ec8\u7ed3\u679c<\/li>\n<\/ul>\n<\/li>\n<p>\u601d\u8003&#xff1a;\u5728\u5904\u7406\u5927\u91cf\u6570\u636e\u65f6&#xff0c;ArrayList\u548cLinkedList\u54ea\u4e2a\u6027\u80fd\u66f4\u597d&#xff1f;\u4e3a\u4ec0\u4e48&#xff1f;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb77\u6b21\uff0c\u70b9\u8d5e2\u6b21\uff0c\u6536\u85cf2\u6b21\u3002\u672c\u6587\u4e3b\u8981\u4ecb\u7ecd\u4e86Java\u96c6\u5408\u6846\u67b6\u7684\u6838\u5fc3\u77e5\u8bc6\u3002\u96c6\u5408\u6846\u67b6\u89e3\u51b3\u4e86\u6570\u7ec4\u7684\u5c40\u9650\u6027\uff0c\u63d0\u4f9b\u4e86\u52a8\u6001\u6269\u5c55\u3001\u4e30\u5bcc\u64cd\u4f5c\u548c\u591a\u79cd\u6570\u636e\u7ed3\u6784\uff08List\u3001Set\u3001Map\uff09\u3002\u91cd\u70b9\u5185\u5bb9\u5305\u62ec\uff1a1\uff09List\u63a5\u53e3\u53ca\u5176\u5b9e\u73b0\u7c7bArrayList\u548cLinkedList\u7684\u7279\u70b9\u4e0e\u9009\u62e9\uff1b2\uff09Set\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7bHashSet\u548cTreeSet\u7684\u53bb\u91cd\u4e0e\u6392\u5e8f\u673a\u5236\uff1b3\uff09Map\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7bHashMap\u3001TreeMap\u548cLinkedHashMap\u7684\u952e\u503c\u5bf9\u5b58\u50a8\u7279\u6027\uff1b4\uff09\u6cdb\u578b\u4fdd\u969c\u7c7b\u578b\u5b89\u5168\uff0cCollections\u5de5\u5177\u7c7b\u63d0\u4f9b\u96c6\u5408\u64cd\u4f5c\u65b9\u6cd5\u3002<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[70,99,374,1056,393,371,190],"topic":[],"class_list":["post-54640","post","type-post","status-publish","format-standard","hentry","category-server","tag-ide","tag-java","tag-java-ee","tag-javaweb","tag-maven","tag-371","tag-190"],"yoast_head":"<!-- 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