{"id":50667,"date":"2023-11-12T23:07:03","date_gmt":"2023-11-17T08:04:10","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java-stream-distinct%e5%87%bd%e6%95%b0%e7%94%a8%e4%ba%8e%e5%8e%bb%e9%99%a4%e9%87%8d%e5%a4%8d%e9%a1%b9%e3%80%82\/"},"modified":"2024-05-04T08:43:30","modified_gmt":"2024-05-04T00:43:30","slug":"java-stream-distinct%e5%87%bd%e6%95%b0%e7%94%a8%e4%ba%8e%e5%8e%bb%e9%99%a4%e9%87%8d%e5%a4%8d%e9%a1%b9%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-stream-distinct%e5%87%bd%e6%95%b0%e7%94%a8%e4%ba%8e%e5%8e%bb%e9%99%a4%e9%87%8d%e5%a4%8d%e9%a1%b9%e3%80%82\/","title":{"rendered":"Java Stream distinct()\u51fd\u6570\u7528\u4e8e\u53bb\u9664\u91cd\u590d\u9879"},"content":{"rendered":"<p>Java Stream \u7684 distinct() \u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u7531\u4e0d\u540c\u5143\u7d20\u7ec4\u6210\u7684\u65b0\u6d41\u3002\u5728\u5904\u7406\u96c6\u5408\u4e4b\u524d\uff0c\u5c06\u91cd\u590d\u7684\u5143\u7d20\u5220\u9664\u662f\u975e\u5e38\u6709\u7528\u7684\u3002<\/p>\n<h2>Java Stream\u7684distinct()\u65b9\u6cd5<\/h2>\n<ul class=\"post-ul\">\n<li>The elements are compared using the equals() method. So it\u2019s necessary that the stream elements have proper implementation of equals() method.<\/li>\n<li>If the stream is ordered, the encounter order is preserved. It means that the element occurring first will be present in the distinct elements stream.<\/li>\n<li>If the stream is unordered, then the resulting stream elements can be in any order.<\/li>\n<li>Stream distinct() is a stateful intermediate operation.<\/li>\n<li>Using distinct() with an ordered parallel stream can have poor performance because of significant buffering overhead. In that case, go with sequential stream processing.<\/li>\n<\/ul>\n<h2>\u4f7f\u7528distinct\uff08\uff09\u51fd\u6570\u5220\u9664\u91cd\u590d\u5143\u7d20\u3002<\/h2>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u770b\u5982\u4f55\u4f7f\u7528\u6d41\u7684distinct()\u65b9\u6cd5\u4ece\u96c6\u5408\u4e2d\u5220\u9664\u91cd\u590d\u5143\u7d20\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; List&lt;Integer&gt; list = List.of(1, 2, 3, 4, 3, 2, 1);\r\nlist ==&gt; [1, 2, 3, 4, 3, 2, 1]\r\n\r\njshell&gt; List&lt;Integer&gt; distinctInts = list.stream().distinct().collect(Collectors.toList());\r\ndistinctInts ==&gt; [1, 2, 3, 4]\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/6564850fa4b2f92e6c7304f9\/6-0.png\" alt=\"Java Stream Distinct Example\" \/><\/div>\n<h2>\u4ec5\u4f7f\u7528Stream\u7684distinct()\u548cforEach()\u65b9\u6cd5\u6765\u5904\u7406\u4e0d\u91cd\u590d\u7684\u5143\u7d20\u3002<\/h2>\n<p>\u7531\u4e8edistinct()\u662f\u4e00\u4e2a\u4e2d\u95f4\u64cd\u4f5c\uff0c\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u5728\u5b83\u4e0a\u9762\u4f7f\u7528forEach()\u65b9\u6cd5\uff0c\u4ec5\u5904\u7406\u552f\u4e00\u7684\u5143\u7d20\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; List&lt;Integer&gt; list = List.of(1, 2, 3, 4, 3, 2, 1);\r\nlist ==&gt; [1, 2, 3, 4, 3, 2, 1]\r\n\r\njshell&gt; list.stream().distinct().forEach(x -&gt; System.out.println(\"Processing \" + x));\r\nProcessing 1\r\nProcessing 2\r\nProcessing 3\r\nProcessing 4\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/6564850fa4b2f92e6c7304f9\/10-0.png\" alt=\"Java Stream Distinct ForEach Example\" \/><\/div>\n<h2>\u4f7f\u7528\u81ea\u5b9a\u4e49\u5bf9\u8c61\u7684distinct()\u65b9\u6cd5<\/h2>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff0c\u4f7f\u7528distinct()\u51fd\u6570\u4ece\u5217\u8868\u4e2d\u5220\u9664\u91cd\u590d\u5143\u7d20\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.java;\r\n\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\nimport java.util.stream.Collectors;\r\n\r\npublic class JavaStreamDistinct {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tList&lt;Data&gt; dataList = new ArrayList&lt;&gt;();\r\n\t\tdataList.add(new Data(10));\r\n\t\tdataList.add(new Data(20));\r\n\t\tdataList.add(new Data(10));\r\n\t\tdataList.add(new Data(20));\r\n\r\n\t\tSystem.out.println(\"Data List = \"+dataList);\r\n\r\n\t\tList&lt;Data&gt; uniqueDataList = dataList.stream().distinct().collect(Collectors.toList());\r\n\r\n\t\tSystem.out.println(\"Unique Data List = \"+uniqueDataList);\r\n\t}\r\n\r\n}\r\n\r\nclass Data {\r\n\tprivate int id;\r\n\r\n\tData(int i) {\r\n\t\tthis.setId(i);\r\n\t}\r\n\r\n\tpublic int getId() {\r\n\t\treturn id;\r\n\t}\r\n\r\n\tpublic void setId(int id) {\r\n\t\tthis.id = id;\r\n\t}\r\n\r\n\t@Override\r\n\tpublic String toString() {\r\n\t\treturn String.format(\"Data[%d]\", this.id);\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\uff1a<\/p>\n<p>\u4ea7\u51fa\u3002<\/p>\n<pre class=\"post-pre\"><code>Data List = [Data[10], Data[20], Data[10], Data[20]]\r\nUnique Data List = [Data[10], Data[20], Data[10], Data[20]]\r\n<\/code><\/pre>\n<p>distinct()\u65b9\u6cd5\u6ca1\u6709\u5220\u9664\u91cd\u590d\u5143\u7d20\u3002\u8fd9\u662f\u56e0\u4e3a\u6211\u4eec\u6ca1\u6709\u5728Data\u7c7b\u4e2d\u5b9e\u73b0equals()\u65b9\u6cd5\u3002\u6240\u4ee5\u4f7f\u7528\u4e86\u8d85\u7c7bObject\u7684equals()\u65b9\u6cd5\u6765\u8bc6\u522b\u76f8\u7b49\u7684\u5143\u7d20\u3002Object\u7c7b\u7684equals()\u65b9\u6cd5\u5b9e\u73b0\u5982\u4e0b\uff1a<\/p>\n<pre class=\"post-pre\"><code>public boolean equals(Object obj) {\r\n    return (this == obj);\r\n}\r\n<\/code><\/pre>\n<p>\u7531\u4e8e\u6570\u636e\u5bf9\u8c61\u5177\u6709\u76f8\u540c\u7684ID\uff0c\u4f46\u5b83\u4eec\u5f15\u7528\u7684\u662f\u4e0d\u540c\u7684\u5bf9\u8c61\uff0c\u6240\u4ee5\u5b83\u4eec\u88ab\u8ba4\u4e3a\u662f\u4e0d\u76f8\u7b49\u7684\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u5982\u679c\u60a8\u8ba1\u5212\u5728\u81ea\u5b9a\u4e49\u5bf9\u8c61\u4e2d\u4f7f\u7528\u6d41\u7684distinct()\u65b9\u6cd5\uff0c\u5b9e\u73b0equals()\u65b9\u6cd5\u975e\u5e38\u91cd\u8981\u3002\u8bf7\u6ce8\u610f\uff0cCollection\u7c7bAPI\u4f7f\u7528equals()\u548chashCode()\u65b9\u6cd5\u6765\u68c0\u67e5\u4e24\u4e2a\u5bf9\u8c61\u662f\u5426\u76f8\u7b49\u3002\u56e0\u6b64\u6700\u597d\u4e3a\u5b83\u4eec\u90fd\u63d0\u4f9b\u5b9e\u73b0\u3002<\/p>\n<pre class=\"post-pre\"><code>@Override\r\npublic int hashCode() {\r\n\tfinal int prime = 31;\r\n\tint result = 1;\r\n\tresult = prime * result + id;\r\n\treturn result;\r\n}\r\n\r\n@Override\r\npublic boolean equals(Object obj) {\r\n\tSystem.out.println(\"Data equals method\");\r\n\tif (this == obj)\r\n\t\treturn true;\r\n\tif (obj == null)\r\n\t\treturn false;\r\n\tif (getClass() != obj.getClass())\r\n\t\treturn false;\r\n\tData other = (Data) obj;\r\n\tif (id != other.id)\r\n\t\treturn false;\r\n\treturn true;\r\n}\r\n<\/code><\/pre>\n<p>\u63d0\u793a\uff1a\u60a8\u53ef\u4ee5\u4f7f\u7528\u201cEclipse &gt; Source &gt; Generate equals() and hashCode()\u201d\u83dc\u5355\u9009\u9879\u8f7b\u677e\u751f\u6210equals()\u548chashCode()\u65b9\u6cd5\u3002\u6dfb\u52a0equals()\u548chashCode()\u5b9e\u73b0\u540e\u7684\u8f93\u51fa\u662f\uff1a<\/p>\n<pre class=\"post-pre\"><code>Data List = [Data[10], Data[20], Data[10], Data[20]]\r\nData equals method\r\nData equals method\r\nUnique Data List = [Data[10], Data[20\r\n<\/code><\/pre>\n<p>\u53c2\u8003: \u6d41distinct() API\u6587\u6863<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java Stream \u7684 distinct() \u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u7531\u4e0d\u540c\u5143\u7d20\u7ec4\u6210\u7684\u65b0\u6d41\u3002\u5728\u5904\u7406\u96c6\u5408\u4e4b\u524d\uff0c\u5c06\u91cd\u590d\u7684\u5143 [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-50667","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"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>Java Stream distinct()\u51fd\u6570\u7528\u4e8e\u53bb\u9664\u91cd\u590d\u9879 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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