{"id":153,"date":"2022-07-30T12:58:22","date_gmt":"2023-01-14T08:05:38","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%aelist%e3%81%a8listarray%e3%81%aeremove%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9\/"},"modified":"2025-07-31T21:12:56","modified_gmt":"2025-07-31T12:12:56","slug":"java%e3%81%aelist%e3%81%a8listarray%e3%81%aeremove%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%aelist%e3%81%a8listarray%e3%81%aeremove%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9\/","title":{"rendered":"Java\u306eList\u3068ListArray\u306eremove()\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9"},"content":{"rendered":"

\u306f\u3058\u3081\u306b<\/h3>\n

Java\u306eList\u306eremove()\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30ea\u30b9\u30c8\u304b\u3089\u8981\u7d20\u3092\u524a\u9664\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002ArrayList\u306fList\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u306e\u6700\u3082\u5e83\u304f\u4f7f\u7528\u3055\u308c\u308b\u5b9f\u88c5\u3067\u3042\u308b\u305f\u3081\u3001\u3053\u3053\u3067\u306fArrayList\u306eremove()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u305f\u4f8b\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n

Java\u306eList\u306eremove()\u30e1\u30bd\u30c3\u30c9<\/h2>\n

\u30ea\u30b9\u30c8\u304b\u3089\u8981\u7d20\u3092\u524a\u9664\u3059\u308b\u305f\u3081\u306b\u306f\u3001remove()\u30e1\u30bd\u30c3\u30c9\u304c\uff12\u3064\u3042\u308a\u307e\u3059\u3002<\/p>\n

    \n
  1. \n
      E remove(int index): \u6307\u5b9a\u3055\u308c\u305f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u8981\u7d20\u3092\u524a\u9664\u3057\u3001\u305d\u306e\u8981\u7d20\u3092\u8fd4\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u4ee5\u964d\u306e\u8981\u7d20\u306f\u5de6\u306b1\u3064\u305a\u3064\u30b7\u30d5\u30c8\u3055\u308c\u307e\u3059\u3002\u6307\u5b9a\u3055\u308c\u305f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u7bc4\u56f2\u5916\u306e\u5834\u5408\u3001IndexOutOfBoundsException\u304c\u30b9\u30ed\u30fc\u3055\u308c\u307e\u3059\u3002\u3082\u3057\u30ea\u30b9\u30c8\u306e\u5b9f\u88c5\u304c\u3053\u306e\u64cd\u4f5c\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u3001UnsupportedOperationException\u304c\u30b9\u30ed\u30fc\u3055\u308c\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n

      boolean remove(Object o): \u6307\u5b9a\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u6700\u521d\u306e\u51fa\u73fe\u3092\u524a\u9664\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u3082\u3057\u30ea\u30b9\u30c8\u304c\u6307\u5b9a\u3055\u308c\u305f\u8981\u7d20\u3092\u542b\u3093\u3067\u3044\u306a\u3044\u5834\u5408\u3001\u30ea\u30b9\u30c8\u306f\u5909\u66f4\u3055\u308c\u307e\u305b\u3093\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u8981\u7d20\u304c\u30ea\u30b9\u30c8\u304b\u3089\u524a\u9664\u3055\u308c\u305f\u5834\u5408\u306b\u306ftrue\u3092\u8fd4\u3057\u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306ffalse\u3092\u8fd4\u3057\u307e\u3059\u3002\u3082\u3057\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cnull\u3067\u3042\u308a\u3001\u30ea\u30b9\u30c8\u304cnull\u8981\u7d20\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u3001NullPointerException\u304c\u30b9\u30ed\u30fc\u3055\u308c\u307e\u3059\u3002\u3082\u3057\u30ea\u30b9\u30c8\u306e\u5b9f\u88c5\u304c\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u3001UnsupportedOperationException\u304c\u30b9\u30ed\u30fc\u3055\u308c\u307e\u3059\u3002<\/p>\n

      remove()\u30e1\u30bd\u30c3\u30c9\u306e\u3044\u304f\u3064\u304b\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n

      \u6307\u5b9a\u3055\u308c\u305f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u8981\u7d20\u3092\u524a\u9664\u3059\u308b\u3002<\/h2>\n

      \u3053\u306e\u4f8b\u3067\u306f\u3001E remove(int index) \u30e1\u30bd\u30c3\u30c9\u3092\u63a2\u7d22\u3057\u307e\u3059\u3002<\/p>\n

      List<\/span><<\/span>String<\/span>><\/span><\/span> list =<\/span> new<\/span> ArrayList<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span>\r\n\r\nlist.<\/span>add<\/span>(<\/span>\"A\"<\/span>)<\/span>;<\/span>\r\nlist.<\/span>add<\/span>(<\/span>\"B\"<\/span>)<\/span>;<\/span>\r\nlist.<\/span>add<\/span>(<\/span>\"C\"<\/span>)<\/span>;<\/span>\r\nlist.<\/span>add<\/span>(<\/span>\"C\"<\/span>)<\/span>;<\/span>\r\nlist.<\/span>add<\/span>(<\/span>\"B\"<\/span>)<\/span>;<\/span>\r\nlist.<\/span>add<\/span>(<\/span>\"A\"<\/span>)<\/span>;<\/span>\r\n\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>list)<\/span>;<\/span>\r\n\r\nString<\/span> removedStr =<\/span> list.<\/span>remove<\/span>(<\/span>1<\/span>)<\/span>;<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>list)<\/span>;<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>removedStr)<\/span>;<\/span>\r\n<\/code><\/pre>\n
      \u6700\u521d\u306b\u3001\u3053\u306e\u30b3\u30fc\u30c9\u306f\u30ea\u30b9\u30c8\u3092\u4f5c\u6210\u3057\u3066\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n
      <\/code><\/pre>\n
      Output<\/div>\n
      <\/code><\/pre>\n
      [A, B, C, C, B, A]<\/p>\n
      <\/code><\/pre>\n
      \u305d\u306e\u5f8c\u3001\u3053\u306e\u30b3\u30fc\u30c9\u306fremove(1)\u3092\u5b9f\u884c\u3057\u3066\u30a4\u30f3\u30c7\u30c3\u30af\u30b91\u306e\u8981\u7d20\u3092\u524a\u9664\u3057\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001\u65b0\u3057\u3044\u30ea\u30b9\u30c8\u3068\u524a\u9664\u3055\u308c\u305f\u8981\u7d20\u3092\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n
      <\/code><\/pre>\n
      Output<\/div>\n
      <\/code><\/pre>\n
      [A, C, C, B, A] B<\/p>\n
      <\/code><\/pre>\n
      \u30a4\u30f3\u30c7\u30c3\u30af\u30b91\u306eB\u304c\u524a\u9664\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n
      2. remove(int index) \u30e1\u30bd\u30c3\u30c9\u306b\u3088\u308b IndexOutOfBoundsException<\/h2>\n
      \u3053\u306e\u4f8b\u3067\u306f\u3001\u30ea\u30b9\u30c8\u304c\u6307\u5b9a\u3057\u305f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8d85\u3048\u305f\u5834\u5408\u306e E remove(int index) \u3092\u63a2\u6c42\u3057\u307e\u3059\u3002<\/p>\n
      List<\/span><<\/span>String<\/span>><\/span><\/span> list =<\/span> new<\/span> ArrayList<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span>\r\n\r\nlist.<\/span>add<\/span>(<\/span>\"A\"<\/span>)<\/span>;<\/span>\r\n\r\nString<\/span> removedStr =<\/span> list.<\/span>remove<\/span>(<\/span>10<\/span>)<\/span>;<\/span>\r\n<\/code><\/pre>\n
      \u3053\u306e\u30b3\u30fc\u30c9\u306f\u3001\u9577\u3055\u304c1\u306e\u30ea\u30b9\u30c8\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u30b3\u30fc\u30c9\u304c\u30a4\u30f3\u30c7\u30c3\u30af\u30b910\u306e\u8981\u7d20\u3092\u524a\u9664\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001<\/p>\n
      <\/code><\/pre>\n
      Output<\/div>\n
      <\/code><\/pre>\n
      Exception in thread “main” java.lang.IndexOutOfBoundsException: Index 10 out of bounds for length 1 at java.base\/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64) at java.base\/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70) at java.base\/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:248) at java.base\/java.util.Objects.checkIndex(Objects.java:372) at java.base\/java.util.ArrayList.remove(ArrayList.java:535) at com.scdev.java.ArrayListRemove.main(ArrayListRemove.java:19)<\/p>\n
      <\/code><\/pre>\n
      \u3053\u306e\u8a66\u307f\u306f\u3001IndexOutOfBoundsException\u3092\u6295\u3052\u307e\u3059\u3002<\/p>\n
      3. \u5909\u66f4\u3067\u304d\u306a\u3044\u30ea\u30b9\u30c8 remove() \u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u306a\u3044\u64cd\u4f5c\u4f8b<\/h2>\n
      List.of()\u30e1\u30bd\u30c3\u30c9\u306f\u5909\u66f4\u4e0d\u53ef\u80fd\u306a\u30ea\u30b9\u30c8\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n
      List<\/span><<\/span>String<\/span>><\/span><\/span> list =<\/span> List<\/span>.<\/span>of<\/span>(<\/span>\"a\"<\/span>,<\/span> \"b\"<\/span>)<\/span>;<\/span>\r\n\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>list)<\/span>;<\/span>\r\n\r\nString<\/span> removedStr =<\/span> list.<\/span>remove<\/span>(<\/span>1<\/span>)<\/span>;<\/span>\r\n\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>removedStr)<\/span>;<\/span>\r\n<\/code><\/pre>\n
      \u6700\u521d\u306b\u3001\u3053\u306e\u30b3\u30fc\u30c9\u306f\u4e0d\u5909\u306a\u30ea\u30b9\u30c8\u3092\u69cb\u7bc9\u3057\u3001\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n
      <\/code><\/pre>\n
        \n
      1. \n
        Output<\/div>\n
        [<\/span>a, b]<\/span><\/li>\n<\/ol>\n
        <\/code><\/pre>\n
         <\/p>\n
        <\/code><\/pre>\n
        \u305d\u306e\u5f8c\u3001\u30b3\u30fc\u30c9\u306fremove()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b91\u306e\u8981\u7d20\u3092\u524a\u9664\u3057\u3088\u3046\u3068\u3057\u307e\u3059\u3002<\/p>\n
        <\/code><\/pre>\n
          \n
        1. Exception in<\/span> thread “main”<\/span> java.lang.UnsupportedOperationException<\/li>\n
        2. at java.base\/java.util.ImmutableCollections.uoe(<\/span>ImmutableCollections.java:142)<\/span><\/li>\n
        3. at java.base\/java.util.ImmutableCollections$AbstractImmutableList<\/span>.remove(<\/span>ImmutableCollections.java:258)<\/span><\/li>\n
        4. at TestRemoveList.main(<\/span>TestRemoveList.java:12)<\/span><\/li>\n<\/ol>\n
          <\/code><\/pre>\n
           <\/p>\n
          <\/code><\/pre>\n
          \u3053\u306e\u8a66\u307f\u306f\u3001UnsupportedOperationException\u3092\u30b9\u30ed\u30fc\u3057\u307e\u3059\u3002\u307e\u305f\u3001list.remove(“a”)\u307e\u305f\u306flist.remove(“b”)\u3092\u8a66\u307f\u308b\u3068\u3001UnsupportedOperationException\u304c\u30b9\u30ed\u30fc\u3055\u308c\u307e\u3059\u3002<\/p>\n
          4. \u30ea\u30b9\u30c8\u304b\u3089\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u524a\u9664\u3059\u308b<\/h2>\n
          \u3053\u306e\u4f8b\u3067\u306f\u3001boolean remove(Object o)\u30e1\u30bd\u30c3\u30c9\u3092\u63a2\u6c42\u3057\u307e\u3059\u3002<\/p>\n
          List<\/span><<\/span>String<\/span>><\/span><\/span> list =<\/span> new<\/span> ArrayList<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span>\r\n\r\nlist.<\/span>add<\/span>(<\/span>\"A\"<\/span>)<\/span>;<\/span>\r\nlist.<\/span>add<\/span>(<\/span>\"B\"<\/span>)<\/span>;<\/span>\r\nlist.<\/span>add<\/span>(<\/span>\"C\"<\/span>)<\/span>;<\/span>\r\nlist.<\/span>add<\/span>(<\/span>\"C\"<\/span>)<\/span>;<\/span>\r\nlist.<\/span>add<\/span>(<\/span>\"B\"<\/span>)<\/span>;<\/span>\r\nlist.<\/span>add<\/span>(<\/span>\"A\"<\/span>)<\/span>;<\/span>\r\n\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>list)<\/span>;<\/span>\r\n\r\nboolean<\/span> isRemoved =<\/span> list.<\/span>remove<\/span>(<\/span>\"C\"<\/span>)<\/span>;<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>list)<\/span>;<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>isRemoved)<\/span>;<\/span>\r\n\r\nisRemoved =<\/span> list.<\/span>remove<\/span>(<\/span>\"X\"<\/span>)<\/span>;<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>list)<\/span>;<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>isRemoved)<\/span>;<\/span>\r\n<\/code><\/pre>\n
          \u6700\u521d\u306b\u3001\u3053\u306e\u30b3\u30fc\u30c9\u306f\u30ea\u30b9\u30c8\u3092\u4f5c\u6210\u3057\u3066\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n
          <\/code><\/pre>\n
          Output<\/div>\n
          <\/code><\/pre>\n
          [A, B, C, C, B, A]<\/p>\n
          <\/code><\/pre>\n
          \u305d\u3057\u3066\u3001\u3053\u306e\u30b3\u30fc\u30c9\u306f\u6700\u521d\u306eC\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u524a\u9664\u3059\u308b\u305f\u3081\u306bremove(“C”)\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002\u6b21\u306b\u3001\u7d50\u679c\u306e\u30ea\u30b9\u30c8\u3092\u8868\u793a\u3057\u3001\u64cd\u4f5c\u306e\u30d6\u30fc\u30eb\u5024\uff08true\uff09\u3082\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n
          <\/code><\/pre>\n
          Output<\/div>\n
          <\/code><\/pre>\n
          [A, B, C, B, A] true<\/p>\n
          <\/code><\/pre>\n
          \u305d\u306e\u5f8c\u3001\u3053\u306e\u30b3\u30fc\u30c9\u306fremove\uff08”X”\uff09\u3092\u5b9f\u884c\u3057\u307e\u3059\u304c\u3001\u30ea\u30b9\u30c8\u306bX\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u5b58\u5728\u3057\u306a\u3044\u305f\u3081\u3001\u30ea\u30b9\u30c8\u306f\u5909\u5316\u3057\u307e\u305b\u3093\u3002\u6700\u5f8c\u306b\u3001\u30ea\u30b9\u30c8\u3068\u64cd\u4f5c\u306e\u30d6\u30fc\u30eb\u5024\uff08false\uff09\u3092\u5370\u5237\u3057\u307e\u3059\u3002<\/p>\n
          <\/code><\/pre>\n
          Output<\/div>\n
          <\/code><\/pre>\n
          [A, B, C, B, A] false<\/p>\n
          <\/code><\/pre>\n
          \u7d50\u8ad6\u3068\u3057\u3066<\/h2>\n
          \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Java\u306eList\u30e1\u30bd\u30c3\u30c9remove()\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3057\u305f\u3002<\/p>\n
          \u304a\u3059\u3059\u3081\u306e\u8aad\u66f8\uff1a<\/p>\n
            \n
          • Java List<\/li>\n
          • Java ArrayList<\/li>\n<\/ul>\n
            \u53c2\u8003\u6587\u732e:<\/p>\n
              \n
            • List remove() API Doc<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
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