{"id":230,"date":"2017-01-17T16:00:00","date_gmt":"2017-01-17T07:00:00","guid":{"rendered":"https:\/\/java-code.jp\/?p=230"},"modified":"2017-01-17T16:00:11","modified_gmt":"2017-01-17T07:00:11","slug":"treemap","status":"publish","type":"post","link":"https:\/\/java-code.jp\/230","title":{"rendered":"TreeMap"},"content":{"rendered":"<p><em class=\"ccenterContents01\">\u30ad\u30fc\u306b\u9806\u5e8f\u3092\u6301\u3063\u305f\u30de\u30c3\u30d7 &#8211; TreeMap\u30af\u30e9\u30b9<\/em><\/p>\n<p>TreeMap\u3082\u307e\u305f\u3001HashMap\u540c\u69d8\u3001\u8981\u7d20\u3092\u30ad\u30fc\u3068\u5024\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u7ba1\u7406\u3059\u308b\u30c7\u30fc\u30bf\u69cb\u9020\u3067\u3059\u304c\u3001\u30ad\u30fc\u306e\u6301\u3061\u65b9\u304c\u7570\u306a\u308a\u307e\u3059\u3002HashMap\u3067\u306f\u30ad\u30fc\u306e\u9806\u756a\u3092\u4fdd\u8a3c\u3057\u306a\u3044\u306e\u306b\u5bfe\u3057\u3066\u3001TreeMap\u3067\u306f\u30ad\u30fc\u3092\u81ea\u52d5\u7684\u306b\u30bd\u30fc\u30c8\u3057\u3001\u9806\u5e8f\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002\u30ad\u30fc\u306e\u91cd\u8907\u3092\u8a31\u3055\u306a\u3044\u70b9\u306f\u3001HashMap\u3068\u540c\u3058\u3067\u3059\u3057\u3001\u5229\u7528\u3067\u304d\u308b\u30e1\u30bd\u30c3\u30c9\u3082\u5171\u901a\u3067\u3059\u3002<\/p>\n<p class=\"list\">CollTree.java<\/p>\n<div class=\"pre\">\n<pre class=\"brush:java;highlight:[8,21];\">\r\npackage com.example.mynavi.collection;\r\n\r\nimport java.util.Map;\r\nimport java.util.TreeMap;\r\n\r\npublic class CollTree {\r\n  public static void main(String[] args) {\r\n    Map&lt;String, String&gt; map = new TreeMap&lt;String, String&gt;() {\r\n      {\r\n        put(\"PC\", \"personal computer\");\r\n        put(\"A\/C\", \"air conditioner\");\r\n        put(\"remote\", \"remote control\");\r\n      }\r\n    };\r\n\r\n    for (String str : map.keySet()) {\r\n      System.out.println(str + \":\" + map.get(str));\r\n    }\r\n    if (!map.isEmpty()) {\r\n      System.out.println(\"\u8981\u7d20\u6570\u306f\" + map.size() + \"\u500b\u3067\u3059\u3002\");\r\n    }\r\n  }\r\n}\r\n<\/pre>\n<p><!-- \/ .pre --><\/div>\n<p class=\"arrow01\">\n<img loading=\"lazy\" decoding=\"async\" src=\"wp-content\/themes\/Javacord\/images\/common\/icon08.gif\" alt=\"\u2193\" width=\"29\" height=\"30\">\n<\/p>\n<div class=\"pre\">\n<pre class=\"brush:java;highlight:[9,18];\">\r\nA\/C:air conditioner\r\nPC:personal computer\r\nremote:remote control\t\u2192 \u30ad\u30fc\u306b\u3064\u3044\u3066\u30bd\u30fc\u30c8\u6e08\u307f\r\n\u8981\u7d20\u6570\u306f3\u500b\u3067\u3059\u3002\r\n<\/pre>\n<p><!-- \/ .pre --><\/div>\n<p>TreeMap\u3067\u306f\u3001\u5f15\u6570\u306bComparator\u3092\u6e21\u3059\u3053\u3068\u3067\u3001\u30bd\u30fc\u30c8\u898f\u5247\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<p class=\"list\">CollCompara.java<\/p>\n<div class=\"pre\">\n<pre class=\"brush:java;\">\r\npackage com.example.mynavi.collection;\r\n\r\nimport java.util.Comparator;\r\nimport java.util.Map;\r\nimport java.util.TreeMap;\r\n\r\npublic class CollCompara {\r\n  public static void main(String[] args) {\r\n    Map&lt;String, String&gt; m = new TreeMap&lt;String, String&gt;(new Comparator&lt;String&gt;() {\r\n      @Override\r\n      public int compare(String o1, String o2) {\r\n        return o2.length() - o1.length();\r\n      }\r\n    });\r\n    m.put(\"PC\", \"personal computer\");\r\n    m.put(\"A\/C\", \"air conditioner\");\r\n    m.put(\"remote\", \"remote control\");\r\n    System.out.println(m);\r\n\t\/\/ \u7d50\u679c\uff1a{remote=remote control, A\/C=air conditioner, PC=personal computer}\r\n  }\r\n}\r\n<\/pre>\n<p><!-- \/ .pre --><\/div>\n<p> Comparator\u3067\u5b9f\u88c5\u3059\u3079\u304d\u30e1\u30bd\u30c3\u30c9\u306f\u3001compare\u30e1\u30bd\u30c3\u30c9\u3060\u3051\u3067\u3059\u3002compare\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u3001\u5f15\u6570o1\u3001o2\u3092\u6bd4\u8f03\u3057\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30eb\u30fc\u30eb\u3067\u623b\u308a\u5024\u3092\u8fd4\u3059\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<p>\u30fb\u300co1 > o2\u300d\u306e\u5834\u5408\u306f\u6b63\u306e\u6574\u6570\u3092\u8fd4\u3059<br \/>\n\t\u30fb\u300co1 < o2\u300d\u306e\u5834\u5408\u306f\u8ca0\u306e\u6574\u6570\u3092\u8fd4\u3059<br \/>\n\t\u30fb\u300co1 = o2\u300d\u306e\u5834\u5408\u306f\u30bc\u30ed\u3092\u8fd4\u3059<\/p>\n<p>TreeMap\u3067\u3042\u308c\u3070\u3001\u30ad\u30fc\u5024\u3092\u9806\u306bo1\u3001o2\u306b\u6e21\u3059\u3053\u3068\u3067\u3001\u30ad\u30fc\u306e\u5927\u5c0f\u3092\u6c7a\u5b9a\u3057\u307e\u3059\u3002\u3053\u306e\u4f8b\u3067\u306f\u3001o2.length\u304b\u3089o1.length\u3092\u6e1b\u7b97\u3057\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u6587\u5b57\u5217\u9577\u306b\u3088\u3063\u3066\u5927\u5c0f\u3092\u6c7a\u3081\u308b\u3001\u3068\u3044\u3046\u610f\u5473\u306b\u306a\u308a\u307e\u3059\u3002\u7d50\u679c\u3092\u898b\u308b\u3068\u3001\u78ba\u304b\u306b\u6587\u5b57\u5217\u9577\u306e\u9577\u3044\u3082\u306e\u304b\u3089\u30ad\u30fc\u304c\u4e26\u3079\u3089\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30ad\u30fc\u306b\u9806\u5e8f\u3092\u6301\u3063\u305f\u30de\u30c3\u30d7 &#8211; TreeMap\u30af\u30e9\u30b9 TreeMap\u3082\u307e\u305f\u3001HashMap\u540c\u69d8\u3001\u8981\u7d20\u3092\u30ad\u30fc\u3068\u5024\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u7ba1\u7406\u3059\u308b\u30c7\u30fc\u30bf\u69cb\u9020\u3067\u3059\u304c\u3001\u30ad\u30fc\u306e\u6301\u3061\u65b9\u304c\u7570\u306a\u308a\u307e\u3059\u3002HashMap\u3067\u306f\u30ad\u30fc\u306e\u9806\u756a\u3092\u4fdd\u8a3c [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-230","post","type-post","status-publish","format-standard","hentry","category-frame"],"_links":{"self":[{"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/posts\/230"}],"collection":[{"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/comments?post=230"}],"version-history":[{"count":5,"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/posts\/230\/revisions"}],"predecessor-version":[{"id":1092,"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/posts\/230\/revisions\/1092"}],"wp:attachment":[{"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/media?parent=230"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/categories?post=230"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/java-code.jp\/wp-json\/wp\/v2\/tags?post=230"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}