{"id":424,"date":"2022-07-31T18:03:27","date_gmt":"2022-12-17T10:26:43","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/%e5%84%aa%e5%85%88%e5%ba%a6%e4%bb%98%e3%81%8d%e3%82%ad%e3%83%a5%e3%83%bc%e3%81%aejava%e5%ae%9f%e8%a3%85\/"},"modified":"2025-07-31T23:29:30","modified_gmt":"2025-07-31T14:29:30","slug":"%e5%84%aa%e5%85%88%e5%ba%a6%e4%bb%98%e3%81%8d%e3%82%ad%e3%83%a5%e3%83%bc%e3%81%aejava%e5%ae%9f%e8%a3%85","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e5%84%aa%e5%85%88%e5%ba%a6%e4%bb%98%e3%81%8d%e3%82%ad%e3%83%a5%e3%83%bc%e3%81%aejava%e5%ae%9f%e8%a3%85\/","title":{"rendered":"\u512a\u5148\u5ea6\u4ed8\u304d\u30ad\u30e5\u30fc\u306eJava\u5b9f\u88c5"},"content":{"rendered":"

\u6642\u6298\u79c1\u305f\u3061\u306f\u7279\u5b9a\u306e\u9806\u5e8f\u3067\u30ad\u30e5\u30fc\u306e\u30a2\u30a4\u30c6\u30e0\u3092\u51e6\u7406\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u512a\u5148\u5ea6\u30ad\u30e5\u30fc\u306f\u305d\u306e\u4ed5\u4e8b\u3092\u884c\u3046\u30c7\u30fc\u30bf\u69cb\u9020\u3067\u3059\u3002Java\u306e\u512a\u5148\u5ea6\u30ad\u30e5\u30fc\u306f\u300c\u901a\u5e38\u306e\u300d\u30ad\u30e5\u30fc\u3068\u306f\u7570\u306a\u308a\u307e\u3059\u3002\u5148\u5165\u308c\u5148\u51fa\u3057\u3067\u306f\u306a\u304f\u3001\u512a\u5148\u5ea6\u306e\u9806\u306b\u30a2\u30a4\u30c6\u30e0\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/p>\n

\u512a\u5148\u5ea6\u4ed8\u304d\u30ad\u30e5\u30fc\u306eJava\u5b9f\u88c5<\/h2>\n
\"Java<\/div>\n

Java\u306ePriorityQueue\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30fc\u306b\u3064\u3044\u3066\u8a00\u3044\u63db\u3048\u308b\u3068\u3001<\/h3>\n
    \n
  1. \n
      \u4ee5\u4e0b\u306e\u3088\u3046\u306b\u65e5\u672c\u8a9e\u306b\u7ffb\u8a33\u3057\u307e\u3059\uff1a<\/ol>\n<\/li>\n<\/ol>\n

      PriorityQueue() – \u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u521d\u671f\u5bb9\u91cf\uff0811\uff09\u3067PriorityQueue\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002
      \nPriorityQueue(Collection c) – \u6307\u5b9a\u3055\u308c\u305f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u3092\u6301\u3064PriorityQueue\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002
      \nPriorityQueue(int initialCapacity) – \u6307\u5b9a\u3055\u308c\u305f\u521d\u671f\u5bb9\u91cf\u3067PriorityQueue\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002
      \nPriorityQueue(int initialCapacity, Comparator comparator) – \u6307\u5b9a\u3055\u308c\u305f\u521d\u671f\u5bb9\u91cf\u3068\u9806\u5e8f\u4ed8\u3051\u306b\u57fa\u3065\u304f\u8981\u7d20\u306eComparator\u3092\u6301\u3064PriorityQueue\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002
      \nPriorityQueue(PriorityQueue c) – \u6307\u5b9a\u3055\u308c\u305fPriorityQueue\u306b\u542b\u307e\u308c\u308b\u8981\u7d20\u3092\u6301\u3064PriorityQueue\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002
      \nPriorityQueue(SortedSet c) – \u6307\u5b9a\u3055\u308c\u305f\u30bd\u30fc\u30c8\u3055\u308c\u305f\u30bb\u30c3\u30c8\u306e\u8981\u7d20\u3092\u6301\u3064PriorityQueue\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n

      \u512a\u5148\u5ea6\u30ad\u30e5\u30fc\u306e\u8981\u7d20\u306f\u3001\u4f5c\u6210\u6642\u306bComparator\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044\u9650\u308a\u3001\u81ea\u7136\u306a\u9806\u5e8f\u3067\u4e26\u3079\u3089\u308c\u307e\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u6607\u9806\u3067\u8981\u7d20\u304c\u9806\u5e8f\u3065\u3051\u3089\u308c\u308b\u305f\u3081\u3001\u30ad\u30e5\u30fc\u306e\u6700\u521d\u306e\u8981\u7d20\u306f\u512a\u5148\u5ea6\u304c\u6700\u3082\u4f4e\u3044\u8981\u7d20\u3067\u3059\u3002\u3082\u3057\u540c\u6642\u306b\u8907\u6570\u306e\u8981\u7d20\u304c\u30ad\u30e5\u30fc\u306e\u5148\u982d\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u5834\u5408\u3001\u305d\u306e\u3088\u3046\u306a\u5834\u5408\u306b\u306f\u4efb\u610f\u306e\u65b9\u6cd5\u3067\u9078\u3070\u308c\u307e\u3059\u3002<\/p>\n

      \u300cJava\u306b\u304a\u3051\u308b\u512a\u5148\u5ea6\u4ed8\u304d\u30ad\u30e5\u30fc\u306e\u4f8b\u300d<\/h3>\n

      \u69d8\u3005\u306a\u30bf\u30b9\u30af\u3092\u542b\u3080\u512a\u5148\u5ea6\u4ed8\u304d\u30ad\u30e5\u30fc\u3092\u4f5c\u6210\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n

      PriorityQueue tasks=new PriorityQueue();\r\ntasks.add(\"task1\");\r\ntasks.add(\"task4\");\r\ntasks.add(\"task3\");\r\ntasks.add(\"task2\");\r\ntasks.add(\"task5\");\r\n<\/code><\/pre>\n
      \u3053\u308c\u306b\u3088\u308a\u3001\u30bf\u30b9\u30af\u306ePriorityQueue\u304c\u4f5c\u6210\u3055\u308c\u3001String\u306e\u81ea\u7136\u306a\u9806\u5e8f\u3067\u9806\u5e8f\u4ed8\u3051\u3089\u308c\u307e\u3059\u3002\u3055\u3089\u306b\u3001\u30bf\u30b9\u30af\u3092\u81ea\u7136\u306a\u9806\u5e8f\u306e\u9006\u9806\u3067\u4e26\u3079\u66ff\u3048\u308b\u5225\u306ePriorityQueue\u3092\u4f5c\u6210\u3057\u307e\u3057\u3087\u3046\u3002\u3057\u305f\u304c\u3063\u3066\u3001Comparator\u3092\u6e21\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
      PriorityQueue reverseTasks=new PriorityQueue(Comparator.reverseOrder());\r\nreverseTasks.add(\"task1\");\r\nreverseTasks.add(\"task4\");\r\nreverseTasks.add(\"task3\");\r\nreverseTasks.add(\"task2\");\r\nreverseTasks.add(\"task5\");\r\n<\/code><\/pre>\n
      Java \u306e PriorityQueue \u30e1\u30bd\u30c3\u30c9<\/h3>\n
      \u3067\u306f\u3001PriorityQueue\u3067\u5229\u7528\u53ef\u80fd\u306a\u3059\u3079\u3066\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u898b\u3066\u3001\u305d\u308c\u3089\u3092\u4f7f\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
        \n
      1. \n
          E add(E e) – \u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u6307\u5b9a\u3055\u308c\u305f\u8981\u7d20\u3092\u30ad\u30e5\u30fc\u306b\u633f\u5165\u3057\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u65e2\u306b5\u3064\u306e\u30bf\u30b9\u30af\u3092\u30ad\u30e5\u30fc\u306b\u8ffd\u52a0\u3057\u307e\u3057\u305f\u3002<\/ol>\n<\/li>\n<\/ol>\n
          Comparator comparator() – \u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u3053\u306e\u30ad\u30e5\u30fc\u306e\u8981\u7d20\u3092\u9806\u5e8f\u4ed8\u3051\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308bComparator\u3092\u8fd4\u3057\u307e\u3059\u3002\u3082\u3057Comparator\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u3067\u3001\u30ad\u30e5\u30fc\u304c\u8981\u7d20\u306e\u81ea\u7136\u306a\u9806\u5e8f\u306b\u5f93\u3063\u3066\u30bd\u30fc\u30c8\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u306f\u3001null\u3092\u8fd4\u3057\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u6b21\u306e\u3088\u3046\u306b\u5b9f\u884c\u3059\u308b\u3068\uff1a<\/p>\n
          System.out.println(tasks.comparator());
          \nSystem.out.println(reverseTasks.comparator());<\/p>\n
          \u51fa\u529b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\uff1a
          \nnull
          \njava.util.Collections$ReverseComparator@15db9742<\/p>\n
          boolean contains(Object o) – \u30ad\u30e5\u30fc\u306b\u6307\u5b9a\u3055\u308c\u305f\u8981\u7d20\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u5834\u5408\u306ftrue\u3092\u8fd4\u3057\u307e\u3059\u3002”task3″\u304c\u512a\u5148\u9806\u4f4d\u4ed8\u304d\u30ad\u30e5\u30fctasks\u306b\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n
          System.out.println(tasks.contains(“task3”));<\/p>\n
          \u3053\u308c\u306f\u4ee5\u4e0b\u3092\u51fa\u529b\u3057\u307e\u3059\uff1a
          \ntrue<\/p>\n
          boolean offer(E e) – add()\u30e1\u30bd\u30c3\u30c9\u3068\u540c\u69d8\u306b\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3082\u8981\u7d20\u3092\u30ad\u30e5\u30fc\u306b\u8ffd\u52a0\u3057\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u5bb9\u91cf\u5236\u7d04\u306e\u3042\u308b\u30ad\u30e5\u30fc\u306e\u5834\u5408\u3001offer()\u30e1\u30bd\u30c3\u30c9\u3068add()\u30e1\u30bd\u30c3\u30c9\u306f\u5b9f\u969b\u306b\u306f\u5c11\u3057\u7570\u306a\u308a\u307e\u3059\u304c\u3001PriorityQueue\u306e\u5834\u5408\u3001\u3069\u3061\u3089\u3082\u540c\u3058\u3067\u3059\u3002add()\u3068\u306f\u7570\u306a\u308a\u3001offer()\u306f\u8981\u7d20\u3092\u30ad\u30e5\u30fc\u306b\u8ffd\u52a0\u3067\u304d\u306a\u304b\u3063\u305f\u5834\u5408\u3067\u3082\u4f8b\u5916\u3092\u30b9\u30ed\u30fc\u3057\u307e\u305b\u3093\u3002<\/p>\n
          E peek() – \u3053\u306e\u30ad\u30e5\u30fc\u306e\u5148\u982d\u8981\u7d20\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002\u30ad\u30e5\u30fc\u304c\u7a7a\u306e\u5834\u5408\u306fnull\u3092\u8fd4\u3057\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u6700\u3082\u512a\u5148\u5ea6\u306e\u9ad8\u3044\u8981\u7d20\u3092\u8fd4\u3057\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u6b21\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\uff1a<\/p>\n
          System.out.println(tasks.peek());
          \nSystem.out.println(reverseTasks.peek());<\/p>\n
          \u6b21\u306e\u3088\u3046\u306a\u51fa\u529b\u304c\u5f97\u3089\u308c\u307e\u3059\uff1a
          \ntask1
          \ntask5<\/p>\n
          E poll() – \u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u30ad\u30e5\u30fc\u306e\u5148\u982d\u8981\u7d20\uff08\u6700\u3082\u512a\u5148\u5ea6\u306e\u9ad8\u3044\u8981\u7d20\uff09\u3092\u53d6\u5f97\u3057\u3001\u30ad\u30e5\u30fc\u304c\u7a7a\u306e\u5834\u5408\u306fnull\u3092\u8fd4\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001peek()\u3068\u306f\u7570\u306a\u308a\u3001\u8981\u7d20\u3092\u524a\u9664\u3057\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u4ee5\u4e0b\u3092\u547c\u3073\u51fa\u3059\u3068\uff1a<\/p>\n
          System.out.println(“tasks\u3067\u306ePoll\uff1a” + tasks.poll());
          \nSystem.out.println(“reverseTasks\u3067\u306ePoll\uff1a” + reverseTasks.poll());<\/p>\n
          \u305d\u3057\u3066peek\u3092\u547c\u3073\u51fa\u3059\u3068\uff1a
          \nSystem.out.println(“tasks\u3067\u306ePeek\uff1a” + tasks.peek());
          \nSystem.out.println(“reverseTasks\u3067\u306ePeek\uff1a” + reverseTasks.peek());<\/p>\n
          \u4ee5\u4e0b\u306e\u3088\u3046\u306a\u51fa\u529b\u304c\u5f97\u3089\u308c\u307e\u3059\uff1a
          \ntasks\u3067\u306ePoll\uff1atask1
          \nreverseTasks\u3067\u306ePoll\uff1atask5
          \ntasks\u3067\u306ePeek\uff1atask2
          \nreverseTasks\u3067\u306ePeek\uff1atask4<\/p>\n
          int size() – \u30ad\u30e5\u30fc\u5185\u306e\u8981\u7d20\u306e\u6570\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
          boolean remove(Object o) – \u6307\u5b9a\u3055\u308c\u305f\u8981\u7d20\u3092\u30ad\u30e5\u30fc\u304b\u3089\u524a\u9664\u3057\u307e\u3059\u3002\u8981\u7d20\u304c2\u3064\u3042\u308b\u5834\u5408\u3067\u3082\u30011\u3064\u3060\u3051\u3092\u524a\u9664\u3057\u307e\u3059\u3002<\/p>\n
          Object[] toArray() – \u30ad\u30e5\u30fc\u5185\u306e\u3059\u3079\u3066\u306e\u8981\u7d20\u3092\u542b\u3080\u914d\u5217\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
          T[] toArray(T[] a) – \u30ad\u30e5\u30fc\u5185\u306e\u3059\u3079\u3066\u306e\u8981\u7d20\u3092\u542b\u3080\u914d\u5217\u3092\u8fd4\u3057\u307e\u3059\u3002\u8fd4\u3055\u308c\u308b\u914d\u5217\u306e\u578b\u306f\u6307\u5b9a\u3055\u308c\u305f\u914d\u5217\u306e\u578b\u3068\u540c\u3058\u3067\u3059\u3002<\/p>\n
          Iterator iterator() – \u30ad\u30e5\u30fc\u306e\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
          void clear() – \u30ad\u30e5\u30fc\u304b\u3089\u3059\u3079\u3066\u306e\u8981\u7d20\u3092\u524a\u9664\u3057\u307e\u3059\u3002<\/p>\n
          \u3053\u308c\u3089\u4ee5\u5916\u306b\u3082\u3001PriorityQueue\u306fCollection\u30af\u30e9\u30b9\u3068Object\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3082\u7d99\u627f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
          Java\u306ePriorityQueue\u306e\u6642\u9593\u8a08\u7b97\u91cf<\/h3>\n
            \n
          1. \n
              \u30a8\u30f3\u30ad\u30e5\u30fc\u3068\u30c7\u30ad\u30e5\u30fc\u306e\u30e1\u30bd\u30c3\u30c9\u306b\u304a\u3044\u3066\u3001\u6642\u9593\u306e\u8907\u96d1\u5ea6\u306fO(log(n))\u3067\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n
               <\/p>\n
                \n
              1. \n
                  \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u524a\u9664\u30e1\u30bd\u30c3\u30c9\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u691c\u7d22\u30e1\u30bd\u30c3\u30c9\u306b\u304a\u3044\u3066\u3001\u6642\u9593\u306e\u8907\u96d1\u5ea6\u306f\u7dda\u5f62\u3067\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n
                   <\/p>\n
                    \u30c7\u30fc\u30bf\u306e\u53d6\u5f97\u30e1\u30bd\u30c3\u30c9\u306b\u304a\u3044\u3066\u306f\u3001\u6642\u9593\u306e\u8907\u96d1\u5ea6\u306f\u5b9a\u6570\u3067\u3059\u3002<\/ol>\n
                    \u3053\u306e\u512a\u5148\u5ea6\u30ad\u30e5\u30fc\u306e\u5b9f\u88c5\u306f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u540c\u671f\u3055\u308c\u305f\u30a2\u30af\u30bb\u30b9\u304c\u5fc5\u8981\u306a\u5834\u5408\u306b\u306f\u3001PriorityBlockingQueue\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u53c2\u7167\uff1aAPI\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/p>\n","protected":false},"excerpt":{"rendered":"
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