{"id":665,"date":"2022-07-21T06:11:39","date_gmt":"2023-08-25T21:59:08","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java%e9%9b%86%e5%90%88-java%e4%b8%ad%e7%9a%84set\/"},"modified":"2025-08-03T01:58:24","modified_gmt":"2025-08-02T17:58:24","slug":"java%e9%9b%86%e5%90%88-java%e4%b8%ad%e7%9a%84set","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e9%9b%86%e5%90%88-java%e4%b8%ad%e7%9a%84set\/","title":{"rendered":"\u6df1\u5165\u7406\u89e3Java\u96c6\u5408\u4e2d\u7684Set\uff1a\u4ece\u57fa\u7840\u5230\u9ad8\u7ea7\u5e94\u7528"},"content":{"rendered":"<div>\n                            <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647bd1a4b2f92e6c72c59b\/0-0.png\" class='post-images' alt=\"\" title=\"\">\n                        <\/div>\n<h3>Java \u96c6\u5408<\/h3>\n<p>\u5728\u8fd9\u4e2a\u90e8\u5206\uff0c\u6211\u4eec\u5c06\u8ba8\u8bba\u5173\u4e8eJava Set\u7684\u4e00\u4e9b\u91cd\u8981\u8981\u70b9\u3002<\/p>\n<ul class=\"post-ul\">\n<li>Java Set interface is a member of the Java Collections Framework.<\/li>\n<li>Unlike List, Set DOES NOT allow you to add duplicate elements.<\/li>\n<li>Set allows you to add at most one null element only.<\/li>\n<li>Set interface got one default method in Java 8: spliterator.<\/li>\n<li>Unlike List and arrays, Set does NOT support indexes or positions of it\u2019s elements.<\/li>\n<li>Set supports Generics and we should use it whenever possible. Using Generics with Set will avoid ClassCastException at runtime.<\/li>\n<li>We can use Set interface implementations to maintain unique elements.<\/li>\n<\/ul>\n<h3>Java Set\u7c7b\u7684\u7c7b\u56fe<\/h3>\n<div>\n                            <img decoding=\"async\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647bd1a4b2f92e6c72c59b\/5-0.jpg\" class='post-images' alt=\"\" title=\"\">\n                        <\/div>\n<h3>Java\u7684\u96c6\u5408\u65b9\u6cd5<\/h3>\n<p>\u5728\u672c\u8282\u4e2d\uff0c\u6211\u4eec\u5c06\u8ba8\u8bba\u4e00\u4e9b\u6709\u7528\u7684Java Set\u65b9\u6cd5\u3002<\/p>\n<ol>\u83b7\u53d6\u96c6\u5408\u4e2d\u5143\u7d20\u7684\u6570\u91cf\u3002<br \/>\n\u68c0\u67e5\u96c6\u5408\u662f\u5426\u4e3a\u7a7a\u3002<br \/>\n\u5982\u679c\u96c6\u5408\u5305\u542b\u6307\u5b9a\u7684\u5143\u7d20\uff0c\u5219\u8fd4\u56detrue\u3002<br \/>\n\u8fd4\u56de\u4e00\u4e2a\u8fed\u4ee3\u5668\uff0c\u7528\u4e8e\u904d\u5386\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u3002\u5143\u7d20\u7684\u8fd4\u56de\u987a\u5e8f\u6ca1\u6709\u7279\u5b9a\u7684\u987a\u5e8f\u3002<br \/>\n\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u96c6\u5408\u4e2d\u6240\u6709\u5143\u7d20\u7684\u6570\u7ec4\u3002\u5982\u679c\u96c6\u5408\u5bf9\u5143\u7d20\u7684\u8fed\u4ee3\u5668\u8fd4\u56de\u987a\u5e8f\u6709\u4efb\u4f55\u4fdd\u8bc1\uff0c\u90a3\u4e48\u8be5\u65b9\u6cd5\u5fc5\u987b\u4ee5\u76f8\u540c\u7684\u987a\u5e8f\u8fd4\u56de\u5143\u7d20\u3002<br \/>\n\u5982\u679c\u6307\u5b9a\u7684\u5143\u7d20\u4e0d\u5b58\u5728\u4e8e\u96c6\u5408\u4e2d\uff0c\u5219\u5c06\u5176\u6dfb\u52a0\u5230\u96c6\u5408\u4e2d\uff08\u53ef\u9009\u64cd\u4f5c\uff09\u3002<br \/>\n\u5982\u679c\u6307\u5b9a\u7684\u5143\u7d20\u5b58\u5728\u4e8e\u96c6\u5408\u4e2d\uff0c\u5219\u5c06\u5176\u4ece\u96c6\u5408\u4e2d\u5220\u9664\uff08\u53ef\u9009\u64cd\u4f5c\uff09\u3002<br \/>\n\u4ece\u96c6\u5408\u4e2d\u5220\u9664\u5305\u542b\u5728\u6307\u5b9a\u96c6\u5408\u4e2d\u7684\u6240\u6709\u5143\u7d20\uff08\u53ef\u9009\u64cd\u4f5c\uff09\u3002<br \/>\n\u4ec5\u4fdd\u7559\u96c6\u5408\u4e2d\u5305\u542b\u5728\u6307\u5b9a\u96c6\u5408\u4e2d\u7684\u5143\u7d20\uff08\u53ef\u9009\u64cd\u4f5c\uff09\u3002<br \/>\n\u4ece\u96c6\u5408\u4e2d\u5220\u9664\u6240\u6709\u5143\u7d20\u3002<br \/>\n\u8fd4\u56de\u4e00\u4e2a\u8fed\u4ee3\u5668\uff0c\u7528\u4e8e\u904d\u5386\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u3002<\/ol>\n<h3>Java\u6570\u7ec4\u8f6c\u6362\u4e3a\u96c6\u5408<\/h3>\n<p>\u4e0eList\u4e0d\u540c\uff0c\u6211\u4eec\u65e0\u6cd5\u76f4\u63a5\u5c06Java\u7684Set\u8f6c\u6362\u4e3a\u6570\u7ec4\uff0c\u56e0\u4e3a\u5b83\u4e0d\u662f\u4f7f\u7528\u6570\u7ec4\u5b9e\u73b0\u7684\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u4e0d\u80fd\u4f7f\u7528Arrays\u7c7b\u6765\u83b7\u53d6\u6570\u7ec4\u4f5c\u4e3a\u96c6\u5408\u7684\u89c6\u56fe\u3002\u6211\u4eec\u53ef\u4ee5\u91c7\u53d6\u53e6\u4e00\u79cd\u65b9\u6cd5\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Arrays.asList()\u65b9\u6cd5\u5c06\u6570\u7ec4\u8f6c\u6362\u4e3aList\uff0c\u7136\u540e\u4f7f\u7528\u5b83\u6765\u521b\u5efa\u4e00\u4e2aSet\u3002\u901a\u8fc7\u4f7f\u7528\u8fd9\u79cd\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u7528\u4e24\u79cd\u65b9\u5f0f\u5c06Java\u6570\u7ec4\u8f6c\u6362\u4e3aSet\u3002\u8ba9\u6211\u4eec\u9010\u4e00\u8ba8\u8bba\u5b83\u4eec\uff0c\u4f7f\u7528\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\u6765\u8bf4\u660e\u7b2c\u4e00\u79cd\u65b9\u6cd5\u3002\u5728\u8fd9\u79cd\u65b9\u6cd5\u4e2d\uff0c\u9996\u5148\u6211\u4eec\u9700\u8981\u4f7f\u7528\u7ed9\u5b9a\u7684\u6570\u7ec4\u521b\u5efa\u4e00\u4e2aList\uff0c\u7136\u540e\u4f7f\u7528\u5b83\u6765\u521b\u5efa\u4e00\u4e2aSet\uff0c\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<pre class=\"post-pre\"><code>import java.util.*;\r\n\r\npublic class ArrayToSet {\r\n   public static void main(String[] args) {\r\n\t\t\r\n\tString[] vowels = {\"a\",\"e\",\"i\",\"o\",\"u\"};\r\n\t\t\r\n\tSet&lt;String&gt; vowelsSet = new HashSet&gt;(Arrays.asList(vowels));\r\n\tSystem.out.println(vowelsSet);\r\n\t\r\n\t\/**\r\n\t * Unlike List, Set is NOt backed by array, \r\n\t * so we can do structural modification without any issues.\r\n\t *\/\r\n\tvowelsSet.remove(\"e\");\r\n\tSystem.out.println(vowelsSet);\r\n\tvowelsSet.clear();\r\n\tSystem.out.println(vowelsSet);\r\n   }\r\n}\r\n<\/code><\/pre>\n<p>\u7b2c\u4e8c\u79cd\u65b9\u6cd5\u662f\u5728\u8fd9\u4e2a\u65b9\u6cd5\u4e2d\uff0c\u6211\u4eec\u4e0d\u4f7f\u7528\u4e2d\u95f4\u5217\u8868\u6765\u4ece\u6570\u7ec4\u521b\u5efa\u4e00\u4e2a\u96c6\u5408\u3002\u9996\u5148\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684\u54c8\u5e0c\u96c6\uff0c\u7136\u540e\u4f7f\u7528Collections.addAll()\u5c06\u6570\u7ec4\u5143\u7d20\u590d\u5236\u5230\u7ed9\u5b9a\u7684\u96c6\u5408\u4e2d\uff0c\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<pre class=\"post-pre\"><code>import java.util.*;\r\n\r\npublic class ArrayToSet2 {\r\n   public static void main(String[] args) {\r\n\t\t\r\n\tString[] vowels = {\"a\",\"e\",\"i\",\"o\",\"u\"};\r\n\t\t\r\n\tSet&lt;String&gt; vowelsSet = new HashSet&lt;&gt;();\r\n\tCollections.addAll(vowelsSet, vowels); \r\n\tSystem.out.println(vowelsSet);\r\n\r\n\t\/** \r\n\t * Unlike List, Set is NOt backed by array, \r\n\t * so we can do structural modification without any issues.\r\n\t *\/\r\n\tvowelsSet.remove(\"e\");\r\n\tSystem.out.println(vowelsSet);\r\n\tvowelsSet.clear();\r\n\tSystem.out.println(vowelsSet);\r\n   }\r\n}\r\n<\/code><\/pre>\n<p>\u5f53\u6211\u4eec\u8fd0\u884c\u4e0a\u8ff0\u4e24\u4e2a\u7a0b\u5e8f\u65f6\uff0c\u6211\u4eec\u5c06\u83b7\u5f97\u4e0e\u4e0b\u9762\u6240\u793a\u7684\u76f8\u540c\u7684\u8f93\u51fa\u7ed3\u679c\u3002<\/p>\n<pre class=\"post-pre\"><code>[a, e, u, i, o]\r\n[a, u, i, o]\r\n[]\r\n<\/code><\/pre>\n<h3>\u5c06Java\u7684Set\u8f6c\u6362\u4e3a\u6570\u7ec4\u3002<\/h3>\n<p>\u5728\u8fd9\u4e2a\u90e8\u5206\uff0c\u6211\u4eec\u5c06\u7f16\u5199\u4e00\u4e2a\u7a0b\u5e8f\uff0c\u4f7f\u7528Set.toArray()\u65b9\u6cd5\u5c06\u4e00\u7ec4\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u6570\u7ec4\u3002<\/p>\n<pre class=\"post-pre\"><code>import java.util.*;\r\n\r\npublic class SetToArray {\r\n   public static void main(String[] args) {\r\n\tSet&lt;String&lt; vowelsSet = new HashSet&lt;&gt;();\r\n\r\n\t\/\/ add example\r\n\tvowelsSet.add(\"a\");\r\n\tvowelsSet.add(\"e\");\r\n\tvowelsSet.add(\"i\");\r\n\tvowelsSet.add(\"o\");\r\n\tvowelsSet.add(\"u\");\r\n\t\t\r\n\t\/\/convert Set to Array\r\n\tString strArray[] = vowelsSet.toArray(new String[vowelsSet.size()]);\r\n\tSystem.out.println(Arrays.toString(strArray)); \r\n   }\r\n}\r\n<\/code><\/pre>\n<p>\u8fd0\u884c\u4ee5\u4e0a\u7a0b\u5e8f\u65f6\uff0c\u6211\u4eec\u5c06\u5f97\u5230\u5982\u4e0b\u6240\u793a\u7684\u8f93\u51fa\u3002<\/p>\n<pre class=\"post-pre\"><code>[a, e, u, i, o]\r\n<\/code><\/pre>\n<h3>Java\u96c6\u5408\u6392\u5e8f<\/h3>\n<p>\u6211\u4eec\u90fd\u77e5\u9053\uff0c\u96c6\u5408\uff08HashSet\uff09\u4e0d\u80fd\u76f4\u63a5\u652f\u6301\u5bf9\u5143\u7d20\u8fdb\u884c\u6392\u5e8f\u3002\u5b83\u5b58\u50a8\u5e76\u4ee5\u968f\u673a\u987a\u5e8f\u663e\u793a\u5176\u5143\u7d20\u3002\u7136\u800c\uff0c\u6211\u4eec\u6709\u4e00\u4e9b\u65b9\u6cd5\u6765\u5bf9\u5176\u5143\u7d20\u8fdb\u884c\u6392\u5e8f\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"post-pre\"><code>import java.util.*;\r\n\r\npublic class SetSortingExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tSet&lt;Integer&gt; intsSet = new HashSet&lt;&gt;();\r\n\t\tRandom random = new Random();\r\n\t\tfor (int i = 0; i  {return (o2-o1);});\r\n\t\tSystem.out.println(\"Reverse Sorting: \" + intsList2);\r\n\r\n\t\t\/\/ Approach-3\r\n\t\tSet&lt;Integer&gt; sortedSet = new TreeSet&lt;&gt;(intsSet);\r\n\t\tSystem.out.println(\"Sorted Set: \" + sortedSet);\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>\u5f53\u6211\u4eec\u8fd0\u884c\u4e0a\u8ff0\u7a0b\u5e8f\u65f6\uff0c\u6211\u4eec\u5c06\u4f1a\u770b\u5230\u5982\u4e0b\u7684\u8f93\u51fa\u7ed3\u679c\u3002<\/p>\n<pre class=\"post-pre\"><code>[560, 864, 176, 657, 135, 103, 40, 123, 555, 589]\r\nNatural Sorting: [40, 103, 123, 135, 176, 555, 560, 589, 657, 864]\r\nBefore Sorting: [560, 864, 176, 657, 135, 103, 40, 123, 555, 589]\r\nReverse Sorting: [864, 657, 589, 560, 555, 176, 135, 123, 103, 40]\r\nSorted Set: [40, 103, 123, 135, 176, 555, 560, 589, 657, 864]\r\n<\/code><\/pre>\n<h3>Java\u96c6\u5408\u7684\u5e38\u89c1\u64cd\u4f5c<\/h3>\n<p>Java Set \u4e0a\u6700\u5e38\u89c1\u7684\u64cd\u4f5c\u662f add\u3001addAll\u3001clear\u3001size \u7b49\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684 Java Set \u793a\u4f8b\uff0c\u5c55\u793a\u4e86\u5e38\u89c1\u7684\u65b9\u6cd5\u7528\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code>import java.util.*;\r\n\r\npublic class SetCommonOperations \r\n{\r\n   public static void main(String args[]) \r\n   {\r\n\tSet&lt;String&gt; vowels= new HashSet&lt;&gt;();\r\n\t\t\r\n\t\/\/add example\r\n\tvowels.add(\"A\");\r\n\tvowels.add(\"E\");\r\n\tvowels.add(\"I\");\r\n\r\n\t\/\/We cannot insert elements based on index to a Set\r\n\tSystem.out.println(vowels);\r\n\t\t\r\n\tSet&lt;String&gt; set = new HashSet&lt;&gt;();\r\n\tset.add(\"O\");\r\n\tset.add(\"U\");\r\n\t\r\n\t\/\/appending set elements to letters\r\n\tvowels.addAll(set);\r\n\tSystem.out.println(vowels);\r\n\t\r\n\t\/\/clear example to empty the set\r\n\tset.clear();\r\n\t\t\r\n\t\/\/size example\r\n\tSystem.out.println(\"letters set size = \" + vowels.size());\r\n\t\t\r\n\tvowels.clear();\r\n\tvowels.add(\"E\"); vowels.add(\"E\");vowels.add(\"I\"); vowels.add(\"O\");\r\n\tSystem.out.println(\"Given set contains E element or not? = \" + vowels.contains(\"E\"));\r\n\t\t\r\n   }\r\n}\r\n<\/code><\/pre>\n<p>\u7ed3\u679c\uff1a<\/p>\n<pre class=\"post-pre\"><code>[A, E, I]\r\n[A, E, U, I, O]\r\nletters set size = 5\r\nGiven set contains E element or not? = true\r\n<\/code><\/pre>\n<h3>Java\u7684\u96c6\u5408\u8fed\u4ee3\u5668<\/h3>\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u8fed\u4ee3\u904d\u5386Java\u7684Set\u96c6\u5408\u3002<\/p>\n<pre class=\"post-pre\"><code>import java.util.*;\r\n\r\npublic class SetIteratorExample\r\n{\r\n   public static void main(String[] args) \r\n   {\r\n\r\n\tSet&lt;Integer&gt; set = new HashSet&lt;&gt;();\r\n\tfor(int i=0; i&lt;5; i++) \r\n\t\tset.add(i);\r\n\t\t\r\n\tIterator iterator = set.iterator();\r\n\t\r\n\t\/\/simple iteration\r\n\twhile(iterator.hasNext()){\r\n\t\tint i = (int) iterator.next();\r\n\t\tSystem.out.print(i + \", \");\r\n\t}\r\n\tSystem.out.println(\"\\n\" + set);\r\n\t\r\n\t\/\/modification of set using iterator\r\n\titerator = set.iterator();\r\n\twhile(iterator.hasNext()){\r\n\t\tint x = (int) iterator.next();\r\n\t\tif(x%2 ==0) iterator.remove();\r\n\t}\r\n\tSystem.out.println(set);\r\n\t\t\r\n\t\/\/changing set structure while iterating\r\n\titerator = set.iterator();\r\n\twhile(iterator.hasNext()){\r\n                \/\/ConcurrentModificationException here\r\n\t\tint x = (int) iterator.next(); \r\n\t\tif(x==1) set.add(10);\r\n\t}\r\n   }\r\n}\r\n<\/code><\/pre>\n<h3>\u5c06 Java \u7684 Set \u8f6c\u6362\u4e3a Stream\u3002<\/h3>\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u5c06Java Set\u8f6c\u6362\u4e3a\u6d41\uff0c\u5e76\u6839\u636e\u6211\u4eec\u7684\u9700\u6c42\u6267\u884c\u4e00\u4e9b\u64cd\u4f5c\u3002<\/p>\n<pre class=\"post-pre\"><code>import java.util.*;\r\n\r\npublic class SetToStream {\r\n\r\n   public static void main(String[] args) {\r\n\tSet&lt;String&gt; vowelsSet = new HashSet&lt;&gt;();\r\n\t\/\/ add example\r\n\tvowelsSet.add(\"a\");\r\n\tvowelsSet.add(\"e\");\r\n\tvowelsSet.add(\"i\");\r\n\tvowelsSet.add(\"o\");\r\n\tvowelsSet.add(\"u\");\r\n\t\t\r\n\t\/\/convert set to stream\r\n\tvowelsSet.stream().forEach(System.out::println);\r\n   }\r\n}\r\n<\/code><\/pre>\n<p>\u4ea7\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>a\r\ne\r\nu\r\ni\r\no\r\n<\/code><\/pre>\n<h3>Java SE 9 \u96c6\u5408<\/h3>\n<p>\u5728Java SE 9\u7248\u672c\u4e2d\uff0cOracle Corp\u5c06\u5411Set\u63a5\u53e3\u6dfb\u52a0\u4e00\u4e9b\u5b9e\u7528\u7684\u5de5\u5177\u65b9\u6cd5\u3002\u6700\u597d\u901a\u8fc7\u4e00\u4e9b\u7b80\u5355\u5b9e\u7528\u7684\u793a\u4f8b\u6765\u7406\u89e3\u5b83\u4eec\u3002\u8bf7\u9605\u8bfb\u6211\u5728\u201cJava SE 9\uff1aSet Factory Methods\u201d\u4e0a\u7684\u6559\u7a0b\u6765\u5b66\u4e60\u5b83\u4eec\u3002\u8fd9\u5c31\u662f\u5bf9Java\u4e2dSet\u7684\u5feb\u901f\u6982\u8ff0\u3002\u6211\u5e0c\u671b\u8fd9\u4e9bJava Set\u793a\u4f8b\u80fd\u5e2e\u52a9\u60a8\u5165\u95e8Set\u96c6\u5408\u7f16\u7a0b\u3002\u611f\u8c22\u60a8\u9605\u8bfb\u6211\u7684\u6559\u7a0b\u3002\u5982\u679c\u60a8\u559c\u6b22\u6211\u7684\u6559\u7a0b\uff0c\u6216\u8005\u6709\u4efb\u4f55\u95ee\u9898\u3001\u5efa\u8bae\u6216\u4efb\u4f55\u7c7b\u578b\u7684\u9519\u8bef\uff0c\u8bf7\u7ed9\u6211\u7559\u8a00\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u96c6\u5408 \u5728\u8fd9\u4e2a\u90e8\u5206\uff0c\u6211\u4eec\u5c06\u8ba8\u8bba\u5173\u4e8eJava Set\u7684\u4e00\u4e9b\u91cd\u8981\u8981\u70b9\u3002 Java Set interfac [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1853,180,1156,252,927],"class_list":{"0":"post-665","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-java-set","8":"tag-java","10":"tag-252","11":"tag-927"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u6df1\u5165\u7406\u89e3Java\u96c6\u5408\u4e2d\u7684Set\uff1a\u4ece\u57fa\u7840\u5230\u9ad8\u7ea7\u5e94\u7528 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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