{"id":739,"date":"2023-11-12T02:53:04","date_gmt":"2022-09-18T18:41:30","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%a7%e9%85%8d%e5%88%97%e8%a6%81%e7%b4%a0%e3%82%92%e5%89%8a%e9%99%a4%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/"},"modified":"2025-08-01T02:04:21","modified_gmt":"2025-07-31T17:04:21","slug":"java%e3%81%a7%e9%85%8d%e5%88%97%e8%a6%81%e7%b4%a0%e3%82%92%e5%89%8a%e9%99%a4%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%e9%85%8d%e5%88%97%e8%a6%81%e7%b4%a0%e3%82%92%e5%89%8a%e9%99%a4%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/","title":{"rendered":"Java\u3067\u914d\u5217\u8981\u7d20\u3092\u524a\u9664\u306e\u65b9\u6cd5"},"content":{"rendered":"

Java\u3067\u914d\u5217\u3092\u4f5c\u6210\u3059\u308b\u969b\u306b\u306f\u3001\u305d\u306e\u30c7\u30fc\u30bf\u578b\u3068\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002JVM\u306f\u3053\u308c\u3092\u4f7f\u7528\u3057\u3066\u3001\u914d\u5217\u8981\u7d20\u306b\u5fc5\u8981\u306a\u30e1\u30e2\u30ea\u3092\u5272\u308a\u5f53\u3066\u307e\u3059\u3002\u914d\u5217\u304b\u3089\u8981\u7d20\u3092\u524a\u9664\u3059\u308b\u305f\u3081\u306e\u7279\u5b9a\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n

1. \u30eb\u30fc\u30d7\u3092\u4f7f\u7528\u3057\u3066\u914d\u5217\u304b\u3089\u8981\u7d20\u3092\u524a\u9664\u3059\u308b\u3002<\/h2>\n

\u3053\u306e\u65b9\u6cd5\u3067\u306f\u3001\u65b0\u3057\u3044\u914d\u5217\u306e\u4f5c\u6210\u304c\u5fc5\u8981\u3067\u3059\u3002\u79c1\u305f\u3061\u306ffor\u30eb\u30fc\u30d7\u3092\u4f7f\u7528\u3057\u3066\u3001\u524a\u9664\u3057\u305f\u3044\u8981\u7d20\u3092\u9664\u3044\u305f\u65b0\u3057\u3044\u914d\u5217\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

package<\/span> com.<\/span>scdev.<\/span>java<\/span>;<\/span>\r\n\r\nimport<\/span> java.<\/span>util.<\/span><\/span>Arrays<\/span><\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Main<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>\r\n        int<\/span>[<\/span>]<\/span> arr =<\/span> new<\/span> int<\/span>[<\/span>]<\/span>{<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>5<\/span>}<\/span>;<\/span>\r\n        int<\/span>[<\/span>]<\/span> arr_new =<\/span> new<\/span> int<\/span>[<\/span>arr.<\/span>length-<\/span>1<\/span>]<\/span>;<\/span>\r\n        int<\/span> j=<\/span>3<\/span>;<\/span>\r\n        for<\/span>(<\/span>int<\/span> i=<\/span>0<\/span>,<\/span> k=<\/span>0<\/span>;<\/span>i<<\/span>arr.<\/span>length;<\/span>i++<\/span>)<\/span>{<\/span>\r\n            if<\/span>(<\/span>i!=<\/span>j)<\/span>{<\/span>\r\n                arr_new[<\/span>k]<\/span>=<\/span>arr[<\/span>i]<\/span>;<\/span>\r\n                k++<\/span>;<\/span>\r\n            }<\/span>\r\n        }<\/span>\r\n        System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"Before deletion :\"<\/span> +<\/span> Arrays<\/span>.<\/span>toString<\/span>(<\/span>arr)<\/span>)<\/span>;<\/span>\r\n        System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"After deletion :\"<\/span> +<\/span> Arrays<\/span>.<\/span>toString<\/span>(<\/span>arr_new)<\/span>)<\/span>;<\/span>\r\n\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\"Arr<\/div>\n
\u3053\u306e\u30b3\u30fc\u30c9\u306f\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b93\u306e\u8981\u7d20\u3092\u524a\u9664\u3057\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u5358\u7d14\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b93\u306e\u8981\u7d20\u4ee5\u5916\u306e\u3059\u3079\u3066\u306e\u8981\u7d20\u3092\u65b0\u3057\u3044\u914d\u5217\u306b\u30b3\u30d4\u30fc\u3057\u307e\u3059\u3002<\/p>\n
\uff12\uff0e\u5024\u306b\u3088\u3063\u3066\u914d\u5217\u8981\u7d20\u3092\u524a\u9664\u3059\u308b\u3002<\/h2>\n
Alternatively:
\n\uff12\uff0e\u5024\u3092\u4f7f\u7528\u3057\u3066\u914d\u5217\u306e\u8981\u7d20\u3092\u524a\u9664\u3059\u308b\u3002<\/p>\n
\u524d\u306e\u5834\u5408\u3068\u306f\u7570\u306a\u308a\u3001\u3053\u306e\u30b3\u30fc\u30c9\u306f\u8981\u7d20\u3092\u5024\u306b\u57fa\u3065\u3044\u3066\u524a\u9664\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u91cd\u8907\u3059\u308b\u8981\u7d20\u3067\u306f\u6a5f\u80fd\u3057\u307e\u305b\u3093\u3002\u306a\u305c\u306a\u3089\u3001\u524a\u9664\u5f8c\u306e\u914d\u5217\u306e\u30b5\u30a4\u30ba\u3092\u77e5\u3063\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n
package<\/span> com.<\/span>scdev.<\/span>java<\/span>;<\/span>\r\nimport<\/span> java.<\/span>util.<\/span><\/span>Arrays<\/span><\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Main<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>\r\n        int<\/span>[<\/span>]<\/span> arr =<\/span> new<\/span> int<\/span>[<\/span>]<\/span>{<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>5<\/span>}<\/span>;<\/span>\r\n        int<\/span>[<\/span>]<\/span> arr_new =<\/span> new<\/span> int<\/span>[<\/span>arr.<\/span>length-<\/span>1<\/span>]<\/span>;<\/span>\r\n        int<\/span> j=<\/span>3<\/span>;<\/span>\r\n        for<\/span>(<\/span>int<\/span> i=<\/span>0<\/span>,<\/span> k=<\/span>0<\/span>;<\/span>i<<\/span>arr.<\/span>length;<\/span>i++<\/span>)<\/span>{<\/span>\r\n            if<\/span>(<\/span>arr[<\/span>i]<\/span>!=<\/span>j)<\/span>{<\/span>\r\n                arr_new[<\/span>k]<\/span>=<\/span>arr[<\/span>i]<\/span>;<\/span>\r\n                k++<\/span>;<\/span>\r\n            }<\/span>\r\n        }<\/span>\r\n        System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"Before deletion :\"<\/span> +<\/span> Arrays<\/span>.<\/span>toString<\/span>(<\/span>arr)<\/span>)<\/span>;<\/span>\r\n        System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"After deletion :\"<\/span> +<\/span> Arrays<\/span>.<\/span>toString<\/span>(<\/span>arr_new)<\/span>)<\/span>;<\/span>\r\n\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\"Arr<\/div>\n
\u3053\u308c\u3068\u524d\u306e\u30b1\u30fc\u30b9\u3068\u306e\u552f\u4e00\u306e\u9055\u3044\u306f\u3001i!=j\u306e\u4ee3\u308f\u308a\u306barr[i]!=j\u304cif\u6761\u4ef6\u306b\u3042\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n
\uff13\uff0e\u91cd\u8907\u8981\u7d20\u3092\u6301\u3064\u914d\u5217\u304b\u3089\u305d\u306e\u5024\u306b\u5fdc\u3058\u3066\u8981\u7d20\u3092\u524a\u9664\u3059\u308b\u3002<\/h2>\n
\u91cd\u8907\u306e\u5024\u306b\u57fa\u3065\u3044\u305f\u524a\u9664\u3092\u884c\u3046\u5834\u5408\u3001ArrayList\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002ArrayList\u306f\u4e8b\u524d\u306b\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u306a\u3044\u305f\u3081\u3001\u52d5\u7684\u306b\u62e1\u5f35\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
package<\/span> com.<\/span>scdev.<\/span>java<\/span>;<\/span>\r\n\r\nimport<\/span> java.<\/span>util.<\/span><\/span>ArrayList<\/span><\/span>;<\/span>\r\nimport<\/span> java.<\/span>util.<\/span><\/span>Arrays<\/span><\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Main<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>\r\n        int<\/span>[<\/span>]<\/span> arr =<\/span> new<\/span> int<\/span>[<\/span>]<\/span>{<\/span>1<\/span>,<\/span>3<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>5<\/span>}<\/span>;<\/span>\r\n        ArrayList<\/span><<\/span>Integer<\/span>><\/span><\/span> arr_new =<\/span> new<\/span> ArrayList<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span>\r\n        int<\/span> j=<\/span>3<\/span>;<\/span>\r\n        for<\/span>(<\/span>int<\/span> i=<\/span>0<\/span>;<\/span>i<<\/span>arr.<\/span>length;<\/span>i++<\/span>)<\/span>{<\/span>\r\n            if<\/span>(<\/span>arr[<\/span>i]<\/span>!=<\/span>j)<\/span>{<\/span>\r\n                arr_new.<\/span>add<\/span>(<\/span>arr[<\/span>i]<\/span>)<\/span>;<\/span>\r\n\r\n            }<\/span>\r\n        }<\/span>\r\n        System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"Before deletion :\"<\/span> +<\/span> Arrays<\/span>.<\/span>toString<\/span>(<\/span>arr)<\/span>)<\/span>;<\/span>\r\n        System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"After deletion :\"<\/span> +<\/span>arr_new)<\/span>;<\/span>\r\n\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\"array-deletion-duplicates\"<\/div>\n
4. \u540c\u3058\u914d\u5217\u5185\u306e\u8981\u7d20\u306e\u79fb\u52d5<\/h2>\n
\u3053\u306e\u65b9\u6cd5\u306f\u3001\u540c\u3058\u914d\u5217\u5185\u306e\u8981\u7d20\u3092\u30b7\u30d5\u30c8\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u884c\u308f\u308c\u307e\u3059\u3002\u8981\u7d20\u306e\u30b7\u30d5\u30c8\u306b\u3088\u308a\u3001\u524a\u9664\u3059\u308b\u8981\u7d20\u306f\u6b21\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u8981\u7d20\u306b\u7f6e\u304d\u63db\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n
package<\/span> com.<\/span>scdev.<\/span>java<\/span>;<\/span>\r\nimport<\/span> java.<\/span>util.<\/span><\/span>Arrays<\/span><\/span>;<\/span>\r\npublic<\/span> class<\/span> Main<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>\r\n        int<\/span>[<\/span>]<\/span> arr =<\/span> new<\/span> int<\/span>[<\/span>]<\/span>{<\/span>1<\/span>,<\/span>3<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>5<\/span>}<\/span>;<\/span>\r\n        int<\/span> j=<\/span>3<\/span>;<\/span>\r\n        System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"Before deletion :\"<\/span> +<\/span> Arrays<\/span>.<\/span>toString<\/span>(<\/span>arr)<\/span>)<\/span>;<\/span>\r\n        int<\/span> count =<\/span>0<\/span>;<\/span>\r\n        for<\/span>(<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> arr.<\/span>length;<\/span> i++<\/span>)<\/span>{<\/span>\r\n            if<\/span>(<\/span>arr[<\/span>i]<\/span> ==<\/span> j)<\/span>{<\/span>\r\n                count++<\/span>;<\/span>\r\n\r\n                \/\/ shifting elements<\/span>\r\n                for<\/span>(<\/span>int<\/span> k =<\/span> i;<\/span> k <<\/span> arr.<\/span>length -<\/span> 1<\/span>;<\/span> k++<\/span>)<\/span>{<\/span>\r\n                    arr[<\/span>k]<\/span> =<\/span> arr[<\/span>k+<\/span>1<\/span>]<\/span>;<\/span>\r\n                }<\/span>\r\n                i--<\/span>;<\/span>\r\n               \/\/ break;<\/span>\r\n            }<\/span>\r\n        }<\/span>\r\n\r\n        System<\/span>.<\/span>out.<\/span>print<\/span>(<\/span>\"After Deletion :\"<\/span> )<\/span>;<\/span>\r\n        for<\/span>(<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> arr.<\/span>length-<\/span>count;<\/span> i++<\/span>)<\/span>{<\/span>\r\n            System<\/span>.<\/span>out.<\/span>print<\/span>(<\/span>\" \"<\/span> +<\/span> arr[<\/span>i]<\/span>)<\/span>;<\/span>\r\n        }<\/span>\r\n        System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>)<\/span>;<\/span>\r\n        System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"Whole array :\"<\/span> +<\/span> Arrays<\/span>.<\/span>toString<\/span>(<\/span>arr)<\/span>)<\/span>;<\/span>\r\n\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u30ab\u30a6\u30f3\u30c8\u5909\u6570\u306f\u524a\u9664\u3055\u308c\u305f\u8981\u7d20\u306e\u6570\u3092\u793a\u3057\u307e\u3059\u3002\u3053\u306e\u5909\u6570\u306f\u3001\u914d\u5217\u304c\u5370\u5237\u3055\u308c\u308b\u3079\u304d\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u307e\u3067\u306e\u30c8\u30e9\u30c3\u30af\u3092\u4fdd\u6301\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u3067\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u91cd\u8907\u3082\u7ba1\u7406\u3057\u307e\u3059\u3002<\/p>\n
\"Shifting<\/div>\n
5. ArrayList\u304b\u3089\u8981\u7d20\u3092\u524a\u9664\u3059\u308b<\/h2>\n
ArrayList\u306f\u914d\u5217\u306b\u3088\u3063\u3066\u652f\u3048\u3089\u308c\u3066\u3044\u307e\u3059\u3002ArrayList\u304b\u3089\u8981\u7d20\u3092\u524a\u9664\u3059\u308b\u64cd\u4f5c\u306f\u7c21\u5358\u3067\u3059\u3002\u7d44\u307f\u8fbc\u307f\u306e\u95a2\u6570\u3092\u547c\u3073\u51fa\u3059\u3060\u3051\u3067\u3059\u3002<\/p>\n
package<\/span> com.<\/span>scdev.<\/span>java<\/span>;<\/span>\r\nimport<\/span> java.<\/span>util.<\/span><\/span>ArrayList<\/span><\/span>;<\/span>\r\nimport<\/span> java.<\/span>util.<\/span><\/span>Arrays<\/span><\/span>;<\/span>\r\npublic<\/span> class<\/span> Main<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>\r\n        int<\/span>[<\/span>]<\/span> arr =<\/span> new<\/span> int<\/span>[<\/span>]<\/span>{<\/span>1<\/span>,<\/span>3<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>5<\/span>}<\/span>;<\/span>\r\n        ArrayList<\/span><<\/span>Integer<\/span>><\/span><\/span> arr_new =<\/span> new<\/span> ArrayList<\/span><<\/span>Integer<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span>\r\n        for<\/span> (<\/span>int<\/span> i :<\/span> arr)<\/span>\r\n        {<\/span>\r\n            arr_new.<\/span>add<\/span>(<\/span>i)<\/span>;<\/span>\r\n        }<\/span>\r\n        arr_new.<\/span>remove<\/span>(<\/span>3<\/span>)<\/span>;<\/span>\r\n        System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"Before deletion :\"<\/span> +<\/span> Arrays<\/span>.<\/span>toString<\/span>(<\/span>arr)<\/span>)<\/span>;<\/span>\r\n        System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"After Deletion:\"<\/span> +<\/span> arr_new)<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
remove(i)\u95a2\u6570\u306e\u547c\u3073\u51fa\u3057\u306f\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9i\u306e\u8981\u7d20\u3092\u524a\u9664\u3057\u307e\u3059\u3002ArrayList\u306e\u5834\u5408\u3001\u914d\u5217\u3068\u6bd4\u8f03\u3057\u3066\u524a\u9664\u304c\u6bd4\u8f03\u7684\u7c21\u5358\u3067\u3059\u3002<\/p>\n
\"ArrayList<\/div>\n
\u7d50\u8ad6<\/h2>\n
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