{"id":922,"date":"2023-01-23T13:08:56","date_gmt":"2023-05-07T18:45:20","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%a7%e3%83%aa%e3%82%b9%e3%83%88%e3%82%92%e3%82%bd%e3%83%bc%e3%83%88%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/"},"modified":"2025-08-01T03:34:06","modified_gmt":"2025-07-31T18:34:06","slug":"java%e3%81%a7%e3%83%aa%e3%82%b9%e3%83%88%e3%82%92%e3%82%bd%e3%83%bc%e3%83%88%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%83%aa%e3%82%b9%e3%83%88%e3%82%92%e3%82%bd%e3%83%bc%e3%83%88%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/","title":{"rendered":"Java\u3067\u30ea\u30b9\u30c8\u3092\u30bd\u30fc\u30c8\u306e\u65b9\u6cd5"},"content":{"rendered":"<p>\u6642\u3005\u3001\u30ea\u30b9\u30c8\u306e\u8981\u7d20\u3092\u51e6\u7406\u3059\u308b\u524d\u306bJava\u3067\u30ea\u30b9\u30c8\u3092\u30bd\u30fc\u30c8\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001\u81ea\u7136\u306a\u9806\u5e8f\u3067\u30ea\u30b9\u30c8\u3092\u30bd\u30fc\u30c8\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3059\u3002\u307e\u305f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ea\u30b9\u30c8\u3092\u30bd\u30fc\u30c8\u3059\u308b\u305f\u3081\u306b\u72ec\u81ea\u306eComparator\u5b9f\u88c5\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u3082\u5b66\u3073\u307e\u3059\u3002Java\u306e\u30ea\u30b9\u30c8\u306f\u3001\u914d\u5217\u3068\u4f3c\u3066\u3044\u307e\u3059\u304c\u3001\u30ea\u30b9\u30c8\u306e\u9577\u3055\u304c\u52d5\u7684\u3067\u3042\u308a\u3001Java\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306b\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002\u5b9f\u969b\u3001\u30ea\u30b9\u30c8\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u3042\u308a\u3001\u307b\u3068\u3093\u3069\u306e\u5834\u5408\u3001ArrayList\u3084LinkedList\u306a\u3069\u306e\u5b9f\u88c5\u306e1\u3064\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<h2>Java\u306e\u30ea\u30b9\u30c8\u3092\u4e26\u3079\u66ff\u3048\u308b<\/h2>\n<p>\u3053\u3053\u3067\u306f\u3001Java\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ea\u30b9\u30c8\u3092\u30bd\u30fc\u30c8\u3059\u308b\u65b9\u6cd5\u3092\u5b66\u3073\u307e\u3059\u3002\u30ea\u30b9\u30c8\u3092\u81ea\u7136\u306a\u6607\u9806\u3067\u30bd\u30fc\u30c8\u3059\u308b\u305f\u3081\u306b\u306f\u3001Collections.sort()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30ea\u30b9\u30c8\u306e\u3059\u3079\u3066\u306e\u8981\u7d20\u306fComparable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3057\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u3001IllegalArgumentException\u304c\u30b9\u30ed\u30fc\u3055\u308c\u307e\u3059\u3002\u6587\u5b57\u5217\u306e\u30ea\u30b9\u30c8\u3092\u30bd\u30fc\u30c8\u3059\u308b\u7c21\u5358\u306a\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.sort;\r\n\r\nimport java.util.ArrayList;\r\nimport java.util.Collections;\r\nimport java.util.List;\r\n\r\npublic class JavaListSort {\r\n\r\n    \/**\r\n     * This class shows how to sort ArrayList in java\r\n     * @param args\r\n     *\/\r\n    public static void main(String[] args) {\r\n        List&lt;String&gt; strList = new ArrayList&lt;String&gt;();\r\n        strList.add(\"A\");\r\n        strList.add(\"C\");\r\n        strList.add(\"B\");\r\n        strList.add(\"Z\");\r\n        strList.add(\"E\");\r\n        \/\/using Collections.sort() to sort ArrayList\r\n        Collections.sort(strList);\r\n        for(String str: strList) System.out.print(\" \"+str);\r\n    }\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u79c1\u305f\u3061\u304cCollections.sort()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u306e\u30ea\u30b9\u30c8\u3092\u30bd\u30fc\u30c8\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002String\u30af\u30e9\u30b9\u306fComparable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3057\u3066\u3044\u307e\u3059\u3002\u51fa\u529b\uff1a<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/6564a47ddaa94e2bdf7c38d9\/5-0.png\" alt=\"Java Sort List\" \/><\/div>\n<h2>Java\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ea\u30b9\u30c8\u3092\u30bd\u30fc\u30c8\u3059\u308b\u3002<\/h2>\n<p>\u5225\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u30ab\u30b9\u30bf\u30e0\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ea\u30b9\u30c8\u3092\u4e26\u3073\u66ff\u3048\u308b\u5834\u5408\u3092\u8003\u3048\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u30af\u30e9\u30b9\u306fComparable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.sort;\r\n\r\nimport java.util.ArrayList;\r\nimport java.util.Collections;\r\nimport java.util.List;\r\n\r\npublic class JavaSortListObject {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tList&lt;Data&gt; dl = new ArrayList&lt;&gt;();\r\n\t\tdl.add(new Data(2));\r\n\t\tdl.add(new Data(3));\r\n\t\tdl.add(new Data(1));\r\n\t\tSystem.out.println(\"Original List::\"+dl);\r\n\t\tCollections.sort(dl);\r\n\t\tSystem.out.println(\"Naturally Sorted List::\"+dl);\r\n\r\n\t}\r\n\r\n}\r\n\r\nclass Data implements Comparable&lt;Data&gt; {\r\n\r\n\tprivate int id;\r\n\r\n\tpublic Data(int i) {\r\n\t\tthis.id = i;\r\n\t}\r\n\r\n\t@Override\r\n\tpublic int compareTo(Data d) {\r\n\t\treturn this.id - d.getId();\r\n\t}\r\n\r\n\tpublic int getId() {\r\n\t\treturn id;\r\n\t}\r\n\r\n\t@Override\r\n\tpublic String toString() {\r\n\t\treturn \"Data{\"+this.id+\"}\";\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>\u51fa\u529b\uff1a<\/p>\n<pre class=\"post-pre\"><code>Original List::[Data{2}, Data{3}, Data{1}]\r\nNaturally Sorted List::[Data{1}, Data{2}, Data{3}]\r\n<\/code><\/pre>\n<h2>Java\u3067Comparator\u3092\u4f7f\u7528\u3057\u3066\u30ea\u30b9\u30c8\u3092\u30bd\u30fc\u30c8\u3059\u308b\u3002<\/h2>\n<p>Collections.sort()\u30e1\u30bd\u30c3\u30c9\u306f\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3055\u308c\u3066\u304a\u308a\u3001\u30bd\u30fc\u30c8\u306e\u30eb\u30fc\u30eb\u3092\u6307\u5b9a\u3059\u308b\u305f\u3081\u306b\u72ec\u81ea\u306eComparator\u5b9f\u88c5\u3092\u63d0\u4f9b\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002Comparator\u306f\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u3042\u308b\u305f\u3081\u3001\u30e9\u30e0\u30c0\u5f0f\u3092\u4f7f\u7528\u3057\u3066\u305d\u306e\u5b9f\u88c5\u30921\u884c\u3067\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>Collections.sort(dl, (d1, d2) -&gt; {\r\n\treturn d2.getId() - d1.getId();\r\n});\r\nSystem.out.println(\"Reverse Sorted List using Comparator::\" + dl);\r\n<\/code><\/pre>\n<p>\u51fa\u529b:<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/6564a47ddaa94e2bdf7c38d9\/15-0.png\" alt=\"Java Sort List Objects Comparator\" \/><\/div>\n<h2>\u8981\u7d04\u3059\u308b\u3068\u3001\u65e5\u672c\u8a9e\u3067\u30cd\u30a4\u30c6\u30a3\u30d6\u306b\u8a00\u3044\u63db\u3048\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u305f\u3060\u3057\u30011\u3064\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u307f\u3067\u3059\u3002<\/h2>\n<p>\u8981\u7d04\uff1a<\/p>\n<p>Collections\u30af\u30e9\u30b9\u306esort()\u30e1\u30bd\u30c3\u30c9\u306f\u3001Java\u3067\u30ea\u30b9\u30c8\u3092\u30bd\u30fc\u30c8\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u30ea\u30b9\u30c8\u306e\u8981\u7d20\u304cComparable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u3001\u81ea\u7136\u306a\u9806\u5e8f\u3067\u30ea\u30b9\u30c8\u3092\u30bd\u30fc\u30c8\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u30bd\u30fc\u30c8\u306e\u30eb\u30fc\u30eb\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306bComparator\u306e\u5b9f\u88c5\u3092\u6e21\u3059\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u308f\u305f\u3057\u305f\u3061\u306eGitHub\u30ea\u30dd\u30b8\u30c8\u30ea\u304b\u3089\u3001\u3055\u3089\u306b\u591a\u304f\u306e\u4f8b\u3092\u30c1\u30a7\u30c3\u30af\u30a2\u30a6\u30c8\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u53c2\u8003: API\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6642\u3005\u3001\u30ea\u30b9\u30c8\u306e\u8981\u7d20\u3092\u51e6\u7406\u3059\u308b\u524d\u306bJava\u3067\u30ea\u30b9\u30c8\u3092\u30bd\u30fc\u30c8\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001\u81ea\u7136\u306a\u9806\u5e8f\u3067\u30ea\u30b9\u30c8\u3092\u30bd\u30fc\u30c8\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3059\u3002\u307e\u305f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ea\u30b9\u30c8\u3092\u30bd\u30fc\u30c8\u3059\u308b\u305f\u3081\u306b\u72ec\u81ea\u306eComparato [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-922","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\u3067\u30ea\u30b9\u30c8\u3092\u30bd\u30fc\u30c8\u306e\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Java\u3067\u30ea\u30b9\u30c8\u3092\u30bd\u30fc\u30c8\u306e\u65b9\u6cd5\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" 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