{"id":732,"date":"2023-08-14T20:22:07","date_gmt":"2022-09-08T20:09:47","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%aestream%e3%81%aedistinct%e9%96%a2%e6%95%b0%e3%81%af%e3%80%81%e9%87%8d%e8%a4%87%e3%82%92%e5%89%8a%e9%99%a4%e3%81%99%e3%82%8b%e3%81%9f%e3%82%81%e3%81%ae%e3%82%82%e3%81%ae%e3%81%a7%e3%81%99\/"},"modified":"2025-08-01T02:01:22","modified_gmt":"2025-07-31T17:01:22","slug":"java%e3%81%aestream%e3%81%aedistinct%e9%96%a2%e6%95%b0%e3%81%af%e3%80%81%e9%87%8d%e8%a4%87%e3%82%92%e5%89%8a%e9%99%a4%e3%81%99%e3%82%8b%e3%81%9f%e3%82%81%e3%81%ae%e3%82%82%e3%81%ae%e3%81%a7%e3%81%99","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%aestream%e3%81%aedistinct%e9%96%a2%e6%95%b0%e3%81%af%e3%80%81%e9%87%8d%e8%a4%87%e3%82%92%e5%89%8a%e9%99%a4%e3%81%99%e3%82%8b%e3%81%9f%e3%82%81%e3%81%ae%e3%82%82%e3%81%ae%e3%81%a7%e3%81%99\/","title":{"rendered":"Java\u306eStream\u306edistinct()\u95a2\u6570\u306f\u3001\u91cd\u8907\u3092\u524a\u9664\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3059\u3002"},"content":{"rendered":"<p>Java\u306eStream\u306edistinct()\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u7570\u306a\u308b\u8981\u7d20\u306e\u65b0\u3057\u3044Stream\u3092\u8fd4\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u91cd\u8907\u3057\u305f\u8981\u7d20\u3092\u51e6\u7406\u3059\u308b\u524d\u306b\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304b\u3089\u9664\u53bb\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<h2>Java\u306eStream\u306edistinct()\u30e1\u30bd\u30c3\u30c9\u3092\u30d1\u30e9\u30d5\u30ec\u30fc\u30ba\u3059\u308b\u3068\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\uff1a\u300cJava\u306eStream\u306edistinct()\u30e1\u30bd\u30c3\u30c9\u300d<\/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>\u91cd\u8907\u3059\u308b\u8981\u7d20\u3092distinct()\u3092\u4f7f\u3063\u3066\u524a\u9664\u3059\u308b\u3002<\/h2>\n<p>\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304b\u3089\u91cd\u8907\u3057\u305f\u8981\u7d20\u3092\u524a\u9664\u3059\u308b\u305f\u3081\u306b\u3001stream distinct() \u30e1\u30bd\u30c3\u30c9\u3092\u3069\u306e\u3088\u3046\u306b\u4f7f\u7528\u3059\u308b\u304b\u898b\u3066\u307f\u307e\u3057\u3087\u3046\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\/65649760daa94e2bdf7c0269\/6-0.png\" alt=\"Java Stream Distinct Example\" \/><\/div>\n<h2>Stream\u306edistinct()\u30e1\u30bd\u30c3\u30c9\u3068forEach()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u91cd\u8907\u8981\u7d20\u3092\u9664\u5916\u3057\u3066\u51e6\u7406\u3059\u308b\u3002<\/h2>\n<p>distinct()\u306f\u4e2d\u9593\u64cd\u4f5c\u306a\u306e\u3067\u3001forEach()\u30e1\u30bd\u30c3\u30c9\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u305d\u308c\u3060\u3051\u30e6\u30cb\u30fc\u30af\u306a\u8981\u7d20\u3092\u51e6\u7406\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\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\/65649760daa94e2bdf7c0269\/10-0.png\" alt=\"Java Stream Distinct ForEach Example\" \/><\/div>\n<h2>\u30ab\u30b9\u30bf\u30e0\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067distinct()\u3092\u4f7f\u3046\u3002<\/h2>\n<p>distinct()\u3092\u4f7f\u7528\u3057\u3066\u30ea\u30b9\u30c8\u304b\u3089\u91cd\u8907\u3057\u305f\u8981\u7d20\u3092\u524a\u9664\u3059\u308b\u30b7\u30f3\u30d7\u30eb\u306a\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.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>\u7d50\u679c\uff1a<\/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()\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u91cd\u8907\u3059\u308b\u8981\u7d20\u3092\u524a\u9664\u3057\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u3053\u308c\u306f\u3001Data\u30af\u30e9\u30b9\u306bequals()\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3057\u3066\u3044\u306a\u304b\u3063\u305f\u305f\u3081\u3067\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u306eObject\u306eequals()\u30e1\u30bd\u30c3\u30c9\u304c\u540c\u3058\u8981\u7d20\u3092\u8b58\u5225\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3057\u305f\u3002Object\u30af\u30e9\u30b9\u306eequals()\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/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>\u540c\u3058ID\u3092\u6301\u3064\u30c7\u30fc\u30bf\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3082\u3001\u53c2\u7167\u3057\u3066\u3044\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7570\u306a\u308b\u5834\u5408\u3001\u305d\u308c\u3089\u306f\u7b49\u3057\u304f\u306a\u3044\u3068\u898b\u306a\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30ab\u30b9\u30bf\u30e0\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3057\u3066\u30b9\u30c8\u30ea\u30fc\u30e0\u306edistinct()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u5834\u5408\u306f\u3001equals()\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002\u307e\u305f\u3001Collection\u30af\u30e9\u30b9\u306eAPI\u3067\u306f\u3001equals()\u30e1\u30bd\u30c3\u30c9\u3068hashCode()\u30e1\u30bd\u30c3\u30c9\u306e\u4e21\u65b9\u304c\u4f7f\u7528\u3055\u308c\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u7b49\u5024\u6027\u306e\u78ba\u8a8d\u306b\u4f7f\u7528\u3055\u308c\u308b\u305f\u3081\u3001\u4e21\u65b9\u306e\u5b9f\u88c5\u3092\u63d0\u4f9b\u3059\u308b\u3053\u3068\u304c\u826f\u3044\u3067\u3057\u3087\u3046\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>\u30d2\u30f3\u30c8\uff1a\u300cEclipse &gt; \u30bd\u30fc\u30b9 &gt; equals() \u3068 hashCode() \u3092\u751f\u6210\u300d\u30e1\u30cb\u30e5\u30fc\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3001equals() \u3068 hashCode() \u30e1\u30bd\u30c3\u30c9\u3092\u7c21\u5358\u306b\u751f\u6210\u3067\u304d\u307e\u3059\u3002equals() \u3068 hashCode() \u3092\u5b9f\u88c5\u3057\u305f\u5f8c\u306e\u51fa\u529b\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/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\u7167: \u30b9\u30c8\u30ea\u30fc\u30e0\u306e distinct() \u30e1\u30bd\u30c3\u30c9\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306eStream\u306edistinct()\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u7570\u306a\u308b\u8981\u7d20\u306e\u65b0\u3057\u3044Stream\u3092\u8fd4\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u91cd\u8907\u3057\u305f\u8981\u7d20\u3092\u51e6\u7406\u3059\u308b\u524d\u306b\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304b\u3089\u9664\u53bb\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002 Java\u306eStream\u306edistinct()\u30e1 [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-732","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"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\u306eStream\u306edistinct()\u95a2\u6570\u306f\u3001\u91cd\u8907\u3092\u524a\u9664\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3059\u3002 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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