{"id":19097,"date":"2017-03-07T20:13:24","date_gmt":"2017-03-07T11:13:24","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=19097"},"modified":"2024-05-06T11:40:44","modified_gmt":"2024-05-06T02:40:44","slug":"%e3%80%90java%e5%ae%9f%e8%b7%b5%e3%80%91map%e2%86%92list%e3%80%81list%e2%86%92map%e5%a4%89%e6%8f%9b%e6%96%b9%e6%b3%95%e3%81%be%e3%81%a8%e3%82%81","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/19097","title":{"rendered":"\u3010Java\u5165\u9580\u3011Map\u3068List\u306e\u76f8\u4e92\u5909\u63db\u307e\u3068\u3081(key\u3001value\u306eList\u5316)"},"content":{"rendered":"<p>Java\u306eList\u3084Map\u306a\u3069\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306f\u3001Map\u2192List\u3001List\u2192Map\u3078\u5909\u63db\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u305d\u3093\u306aMap\u3068List\u306e\u5909\u63db\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3001\u4ee5\u4e0b\u306e\u5185\u5bb9\u3067\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<br \/>\n<div class=\"box01\"><\/p>\n<ul>\n<li><b>\u3010\u57fa\u790e\u3011Map\u3068List\u306e\u9055\u3044<\/b><\/li>\n<li><b>\u3010\u57fa\u790e\u3011Map\u304b\u3089List\u3078\u5909\u63db<\/b><\/li>\n<li><b>\u3010\u57fa\u790e\u3011List\u304b\u3089Map\u3078\u5909\u63db<\/b><\/li>\n<li><b>\u3010\u767a\u5c55\u3011Java8\u306eStream\u3092\u4f7f\u3046\u65b9\u6cd5<\/b><\/li>\n<\/ul>\n<\/div>\n<p>\u4eca\u56de\u306fMap\u3068List\u306e\u5909\u63db\u306b\u3064\u3044\u3066\u3001\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\uff01<\/p>\n<p>\u306a\u304a\u3001Java\u306e\u8a18\u4e8b\u306b\u3064\u3044\u3066\u306f\u3001<a href=\"https:\/\/www.sejuku.net\/blog\/148098\" target=\"_blank\" rel=\"noopener\">\u3053\u3061\u3089<\/a>\u306b\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>Map\u3068List\u306e\u9055\u3044<\/h2>\n<p>\u305d\u3082\u305d\u3082\u3001Map\u3068List\u306f\u3069\u3061\u3089\u3082\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u4e00\u7a2e\u3067\u3059\u304c\u4f55\u304c\u9055\u3046\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>Map\u3092List\u306b\u5909\u63db\u3059\u308b\u30e1\u30ea\u30c3\u30c8\u3001List\u3092Map\u306b\u5909\u63db\u3059\u308b\u30e1\u30ea\u30c3\u30c8\u306f\u3069\u3053\u306b\u3042\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>\u7279\u9577\u306e\u9055\u3044<\/h3>\n<p>Map\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3068\u306a\u308b<b>key<\/b>\u3068\u305d\u306e\u30c7\u30fc\u30bf\u3068\u306a\u308b<b>value<\/b>\u306e\u4e21\u65b9\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002key\u306b\u306f\u6574\u6570\u5024\u306e\u307b\u304b\u306bString\u578b\u306a\u3069\u306e\u5909\u6570\u306a\u3069\u3082\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002key\u306b\u6307\u5b9a\u3057\u305f\u5909\u6570\u304b\u3089\u3001value\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001Map\u306e<b>\u30ad\u30fc\u306f\u91cd\u8907\u3055\u305b\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093<\/b>\u3002\u3053\u308c\u306b\u5bfe\u3057\u3066\u3001List\u306f\u8981\u7d20\u3092\u683c\u7d0d\u3057\u305f\u9806\u306b\u81ea\u52d5\u7684\u306b\u6574\u6570\u5024\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u751f\u6210\u3055\u308c\u3001\u5024\u3068\u7d10\u3065\u3051\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>List\u306e\u8981\u7d20\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u3092\u6307\u5b9a\u3057\u3066\u3001\u5024\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002key\u3068\u95a2\u9023\u4ed8\u3051\u3066\u5024\u3092\u4fdd\u6301\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306fMap\u304c\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001List\u306f\u8981\u7d20\u306e\u5024\u3067\u4e26\u3073\u9806\u3092\u66ff\u3048\u308b\u30bd\u30fc\u30c8\u304c\u3067\u304d\u307e\u3059\u304c\u3001Map\u306f\u305d\u306e\u307e\u307e\u3067\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>Map\u306ekey\u3084value\u3092<b>List\u3084\u914d\u5217\u306b\u5909\u63db<\/b>\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u8981\u7d20\u306e\u9806\u756a\u304c\u5fc5\u8981\u3068\u306a\u308b\u5834\u5408\u306fList\u304c\u9069\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u304b\u3089\u5148\u306e\u89e3\u8aac\u3092\u53c2\u8003\u306b\u3057\u3066\u3001\u76ee\u7684\u306b\u5408\u308f\u305b\u3066\u5909\u63db\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\uff01<\/p>\n<h3>\u5b9a\u7fa9\u306e\u9055\u3044(HashMap\u3068ArrayList)<\/h3>\n<p>Map\u3084List\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u3059\u306e\u3067\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3059\u308b\u306b\u306f\u5225\u306e\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>Map\u306e\u5834\u5408\u306fHashMap\u30af\u30e9\u30b9\u3092\u3001List\u306e\u5834\u5408\u306fArrayList\u30af\u30e9\u30b9\u306a\u3069\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3089\u3092\u4f7f\u3063\u3066\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">Map&lt;String, Integer&gt; map = new HashMap&lt;&gt;();\r\nList&lt;String&gt; list = new ArrayList&lt;&gt;();<\/pre>\n<p>Map\u3082List\u3082\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u304c\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u5ba3\u8a00\u3067\u304d\u307e\u3059\u3002\u305d\u308c\u305e\u308c\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u683c\u7d0d\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001\u3053\u306e\u4f8b\u3067\u306fMap\u306ekey\u306fString\u578b\u3001value\u306fInteger\u578b\u3067\u6307\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u578b\u306e\u6307\u5b9a\u306f\u30af\u30e9\u30b9\u578b\u3067\u884c\u3044\u307e\u3059\u3002<\/p>\n<p>int\u578b\u306a\u3069\u306e<b>\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306f\u4f7f\u7528\u3067\u304d\u306a\u3044\u306e\u3067\u6ce8\u610f<\/b>\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>Map\u304b\u3089List\u3078\u5909\u63db<\/h2>\n<p>\u3053\u3053\u3067\u306f\u3001Map\u306ekey\u3092List\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u3001Map\u306evalue\u3092List\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u3092\u305d\u308c\u305e\u308c\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\uff01<\/p>\n<h3>Map\u306ekey\u3092List\u306b\u5909\u63db<\/h3>\n<p>Map\u306ekey(\u30ad\u30fc)\u3092List\u306b\u5909\u63db\u3059\u308b\u306b\u306f<b>keySet\u30e1\u30bd\u30c3\u30c9<\/b>\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306b\u3001Map\u306e\u30ad\u30fc\u3092List\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:java decode:true \">import java.util.ArrayList;\r\nimport java.util.HashMap;\r\nimport java.util.List;\r\nimport java.util.Map;\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/Map\u306e\u5ba3\u8a00\r\n        Map&lt;String, Integer&gt; map = new HashMap&lt;&gt;();\r\n        map.put(\"apple\", 1);\r\n        map.put(\"orange\", 2);\r\n        map.put(\"melon\", 3);\r\n        \r\n        \/\/List\u3092\u5ba3\u8a00\u3057\u3001keySet\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30ad\u30fc\u306e\u5024\u3092\u53d6\u5f97\u3059\u308b\r\n        List&lt;String&gt; list = new ArrayList&lt;&gt;(map.keySet());\r\n        System.out.println(list);\r\n    }\r\n\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">[apple, melon, orange]<\/pre>\n<p>\u30b5\u30f3\u30d7\u30eb\u3067\u306fMap\u30af\u30e9\u30b9\u3092\u5ba3\u8a00\u3057\u3001\u5909\u6570map\u306bput\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30ad\u30fc\u3068\u5024\u3092\u305d\u308c\u305e\u308c\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306bList\u30af\u30e9\u30b9\u3092\u5ba3\u8a00\u3057\u3001keySet\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066Map\u306e\u30ad\u30fc\u3092\u5909\u6570list\u306b\u683c\u7d0d\u3057\u3066\u3044\u307e\u3059\u3002List\u306e\u4e2d\u8eab\u3092\u78ba\u8a8d\u3059\u308b\u3068\u3001Map\u3067\u8ffd\u52a0\u3057\u305fkey\u304c\u5168\u3066\u53d6\u5f97\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<h3>Map\u306evalue\u3092List\u306b\u5909\u63db<\/h3>\n<p>value(\u5024)\u3092\u53d6\u5f97\u3059\u308b\u5834\u5408\u306fvalues\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<p>Map\u306e\u5024\u3092List\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u7d39\u4ecb\u3057\u305f\u30b5\u30f3\u30d7\u30eb\u306e\u300cList\u3092\u5ba3\u8a00\u3057\u3066Map\u306e\u30ad\u30fc\u3092\u53d6\u5f97\u3059\u308b\u7b87\u6240\u300d\u3092\u5909\u66f4\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:java decode:true \">import java.util.ArrayList;\r\nimport java.util.HashMap;\r\nimport java.util.List;\r\nimport java.util.Map;\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/Map\u306e\u5ba3\u8a00\r\n        Map&lt;String, Integer&gt; map = new HashMap&lt;&gt;();\r\n        map.put(\"apple\", 1);\r\n        map.put(\"orange\", 2);\r\n        map.put(\"melon\", 3);\r\n        \r\n        \/\/List\u3092\u5ba3\u8a00\u3057\u3001values\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u5024\u3092\u53d6\u5f97\u3059\u308b\r\n        List&lt;Integer&gt; list = new ArrayList&lt;&gt;(map.values());\r\n        System.out.println(list);\r\n    }\r\n\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">[2, 1, 3]<\/pre>\n<p>key\u306e\u5024\u53d6\u5f97\u3068\u7570\u306a\u308b\u70b9\u306f\u3001Map\u3092List\u306b\u5909\u63db\u6642\u306bkey\u306e\u53d6\u5f97\u306fkeySet\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u306e\u306b\u5bfe\u3057\u3066\u3001value\u3092\u53d6\u5f97\u3059\u308b\u5834\u5408\u306f<b>values\u30e1\u30bd\u30c3\u30c9<\/b><b>\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/b><\/p>\n<p>List\u306e\u4e2d\u8eab\u3092\u78ba\u8a8d\u3059\u308b\u3068\u3001Map\u3067\u8ffd\u52a0\u3057\u305fvalue\u304c\u5168\u3066\u53d6\u5f97\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<h2>List\u304b\u3089Map\u3078\u5909\u63db<\/h2>\n<p>\u3053\u3053\u3067\u306f\u3001List\u3067\u8a2d\u5b9a\u3057\u305f\u5024\u3092Map\u306ekey\u3068value\u3078\u5909\u63db\u3059\u308b\u65b9\u6cd5\u3092\u3001\u305d\u308c\u305e\u308c\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h3>List\u306e\u5024\u3092Map\u306ekey\u306b\u5909\u63db<\/h3>\n<p>\u4ee5\u4e0b\u306b\u3001List\u306e\u5024\u3092Map\u306ekey\u3078\u8a2d\u5b9a\u3059\u308b\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:java decode:true \">import java.util.ArrayList;\r\nimport java.util.HashMap;\r\nimport java.util.List;\r\nimport java.util.Map;\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/List\u306e\u5ba3\u8a00\r\n        List&lt;Integer&gt; list = new ArrayList&lt;&gt;();\r\n        \r\n        list.add(1);\r\n        list.add(2);\r\n        list.add(3);\r\n        \r\n        \/\/Map\u306e\u5ba3\u8a00\r\n        Map&lt;Integer, String&gt; map = new HashMap&lt;&gt;();\r\n        \r\n        for(Integer num : list) {\r\n            \/\/ Map\u306bList\u306e\u30ad\u30fc\u3068\u5024\u3092\u8ffd\u52a0\r\n            map.put(num, \"apple\");\r\n        }\r\n        \r\n        System.out.println(map);\r\n    }\r\n\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">{1=apple, 2=apple, 3=apple}<\/pre>\n<p>\u30b5\u30f3\u30d7\u30eb\u3067\u306fList\u30af\u30e9\u30b9\u3092\u5ba3\u8a00\u3057\u3001\u5909\u6570list\u306b\u5024\u3092\u8ffd\u52a0\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306bMap\u30af\u30e9\u30b9\u3092\u5ba3\u8a00\u3057\u3001\u62e1\u5f35for\u6587\u3092\u4f7f\u7528\u3057\u3066list\u3092\u30eb\u30fc\u30d7\u3057\u3066\u3001List\u306e\u5024\u3092put\u30e1\u30bd\u30c3\u30c9\u3067Map\u306ekey\u3068\u3057\u3066\u683c\u7d0d\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>List\u306e\u5024\u3092Map\u306evalue\u3078\u5909\u63db<\/h3>\n<p>\u4ee5\u4e0b\u306b\u3001List\u306e\u5024\u3092Map\u306evalue\u3078\u8a2d\u5b9a\u3059\u308b\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:java decode:true\">import java.util.ArrayList;\r\nimport java.util.HashMap;\r\nimport java.util.List;\r\nimport java.util.Map;\r\n\r\npublic class Main {\r\n \r\n    public static void main(String[] args) {\r\n        \/\/List\u306e\u5ba3\u8a00\r\n        List&lt;String&gt; list = new ArrayList&lt;&gt;();\r\n        \r\n        list.add(\"apple\");\r\n        list.add(\"orange\");\r\n        list.add(\"melon\");\r\n        \r\n        \/\/Map\u306e\u5ba3\u8a00\r\n        Map&lt;Integer, String&gt; map = new HashMap&lt;&gt;();\r\n        \r\n        int i = 1;\r\n        for(String str : list) {\r\n            \/\/ Map\u306bList\u306e\u5024\u3092\u8ffd\u52a0\r\n            map.put(i, str);\r\n            i++;\r\n        }\r\n        \r\n        System.out.println(map);\r\n    }\r\n\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">{1=apple, 2=orange, 3=melon}<\/pre>\n<p>\u30b5\u30f3\u30d7\u30eb\u3067\u306fList\u30af\u30e9\u30b9\u3092\u5ba3\u8a00\u3057\u3001\u5909\u6570list\u306b\u5024\u3092\u8ffd\u52a0\u3057\u3066\u3044\u307e\u3059\u3002\u6b21\u306bMap\u30af\u30e9\u30b9\u3092\u5ba3\u8a00\u3057\u3001\u62e1\u5f35for\u6587\u3092\u4f7f\u7528\u3057\u3066list\u3092\u30eb\u30fc\u30d7\u3057\u3066\u3001put\u30e1\u30bd\u30c3\u30c9\u3067Map\u306e\u8981\u7d20\u3092\u683c\u7d0d\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>Map\u306ekey\u306b\u95a2\u3057\u3066\u306f\u3001\u5909\u6570int\u578b\u306e\u5909\u6570i\u3092\u5ba3\u8a00\u3057\u3001\u30eb\u30fc\u30d7\u3067\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8\u3057\u3066Map\u306ekey\u3068\u3057\u3066\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u5b9f\u884c\u7d50\u679c\u3092\u78ba\u8a8d\u3059\u308b\u3068\u3001\u5909\u6570map\u306evalue\u304c\u53d6\u5f97\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<h2>Java8\u306eStream\u3092\u4f7f\u3046\u65b9\u6cd5<\/h2>\n<p>Java8\u3067\u306fStream API\u3092\u4f7f\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>Map\u304b\u3089List\u3078\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306f\u5909\u308f\u308a\u3042\u308a\u307e\u305b\u3093\u304c\u3001<b>List\u304b\u3089Map\u3078\u5909\u63db\u3059\u308b\u65b9\u6cd5\u304c\u7c21\u6f54\u306b\u8a18\u8ff0<\/b>\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001List\u306e\u6587\u5b57\u5217\u3092Map\u306ekey\u306b\u305d\u306e\u6587\u5b57\u5217\u306e\u9577\u3055\u3092value\u306b\u683c\u7d0d\u3057\u305fMap\u306b\u5909\u63db\u3059\u308b\u5834\u5408\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">Map&lt;String, Integer&gt; map = list.stream()      \/\/ 1. list\u3092stream()\u306b\u6e21\u3059\u3002\r\n    .collect(Collectors.toMap(   \/\/ 2. stream\u3092collect()\u30e1\u30bd\u30c3\u30c9\u306b\u6e21\u3057\u3001Collectors\u30af\u30e9\u30b9\u306eMap\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u884c\u3057\u307e\u3059\r\n    s -&gt; s, \/\/ 3. Map\u30ad\u30fc\u3092\u53d6\u5f97\u3059\u308b\u30e9\u30e0\u30c0\u5f0f\r\n    s -&gt; s.length() \/\/ 4. Map\u306e\u5024\u3092\u53d6\u5f97\u3059\u308b\u30e9\u30e0\u30c0\u5f0f\r\n));<\/pre>\n<p>\u8a73\u3057\u3044\u8aac\u660e\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089\u306e\u30b5\u30a4\u30c8\u3092\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u306d\u3001<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/15900\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/09\/java-list-map-stream-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011List\u21d4Map\u5909\u63db\u3067Java8\u306eStream\u3092\u4f7f\u3046\u65b9\u6cd5<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h2>\u521d\u671f\u5316\u3001\u5024\u306e\u53d6\u5f97\u306a\u3069Map\u306b\u3064\u3044\u3066\u77e5\u308a\u305f\u3044\uff01<\/h2>\n<p>\u521d\u671f\u5316\u3001get\u3067\u306e\u5024\u306e\u53d6\u5f97\u3001for\u30fbforEach\u3001\u30bd\u30fc\u30c8\u306a\u3069Map\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u3057\u308a\u305f\u3044\u65b9\u306f\u3001\u4ee5\u4e0b\u306e\u8a18\u4e8b\u306b\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u306d\uff01<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/19796\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/03\/hashmap-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010Java\u5165\u9580\u3011Map\u306e\u4f7f\u3044\u65b9\u7dcf\u307e\u3068\u3081(HashMap\u3067\u521d\u671f\u5316\u3001\u5024\u306e\u30bd\u30fc\u30c8)<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h2>\u307e\u3068\u3081<\/h2>\n<p>Map\u304b\u3089List\u3001List\u304b\u3089Map\u3078\u5909\u63db\u3059\u308b\u65b9\u6cd5\u3092\u4e00\u901a\u308a\u8aac\u660e\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u5b9f\u969b\u306e\u696d\u52d9\u3067\u3082\u3001\u3053\u3053\u3067\u8aac\u660e\u3057\u305f\u3088\u3046\u306a\u5909\u63db\u51e6\u7406\u304c\u5fc5\u8981\u306b\u306a\u308b\u3053\u3068\u304c\u5ea6\u3005\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u3053\u306e\u6a5f\u4f1a\u306b\u305c\u3072\u899a\u3048\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u3082\u3057\u3001Map\u3084List\u306a\u3069\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u5909\u63db\u65b9\u6cd5\u3092\u5fd8\u308c\u3066\u3057\u307e\u3063\u305f\u3089\u3001\u3053\u306e\u8a18\u4e8b\u3092\u601d\u3044\u51fa\u3057\u3066\u304f\u3060\u3055\u3044\u306d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306eList\u3084Map\u306a\u3069\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306f\u3001Map\u2192List\u3001List\u2192Map\u3078\u5909\u63db\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002 \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u305d\u3093\u306aMap\u3068List\u306e\u5909\u63db\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3001\u4ee5\u4e0b\u306e\u5185\u5bb9\u3067\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002 \u3010\u57fa\u790e\u3011Map\u3068Lis [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":34928,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"","footnotes":""},"categories":[2344],"tags":[67],"class_list":["post-19097","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-study","tag-java"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u3010Java\u5165\u9580\u3011Map\u3068List\u306e\u76f8\u4e92\u5909\u63db\u307e\u3068\u3081(key\u3001value\u306eList\u5316) | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0<\/title>\n<meta name=\"description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c \u3010Java\u5165\u9580\u3011Map\u3068List\u306e\u76f8\u4e92\u5909\u63db\u307e\u3068\u3081(key\u3001value\u306eList\u5316) \u300d\u306b\u3064\u3044\u3066\u3001\u8ab0\u3067\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u3081\u3070\u3001\u3042\u306a\u305f\u306e\u60a9\u307f\u304c\u89e3\u6c7a\u3059\u308b\u3060\u3051\u3058\u3083\u306a\u304f\u3001\u65b0\u305f\u306a\u6c17\u4ed8\u304d\u3082\u767a\u898b\u3067\u304d\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u304a\u60a9\u307f\u306e\u65b9\u306f\u305c\u3072\u3054\u4e00\u8aad\u304f\u3060\u3055\u3044\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sejuku.net\/blog\/19097\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010Java\u5165\u9580\u3011Map\u3068List\u306e\u76f8\u4e92\u5909\u63db\u307e\u3068\u3081(key\u3001value\u306eList\u5316) | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0\" \/>\n<meta property=\"og:description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c \u3010Java\u5165\u9580\u3011Map\u3068List\u306e\u76f8\u4e92\u5909\u63db\u307e\u3068\u3081(key\u3001value\u306eList\u5316) 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