{"id":17266,"date":"2024-03-16T06:20:26","date_gmt":"2024-03-15T21:20:26","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ae%e6%96%87%e5%ad%97%e5%88%97%e7%bd%ae%e6%8f%9b%e3%81%ae%e5%8a%b9%e7%8e%87%e3%82%92%e5%90%91%e4%b8%8a%e3%81%95%e3%81%9b%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99\/"},"modified":"2025-08-06T11:03:23","modified_gmt":"2025-08-06T02:03:23","slug":"java%e3%81%ae%e6%96%87%e5%ad%97%e5%88%97%e7%bd%ae%e6%8f%9b%e3%81%ae%e5%8a%b9%e7%8e%87%e3%82%92%e5%90%91%e4%b8%8a%e3%81%95%e3%81%9b%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ae%e6%96%87%e5%ad%97%e5%88%97%e7%bd%ae%e6%8f%9b%e3%81%ae%e5%8a%b9%e7%8e%87%e3%82%92%e5%90%91%e4%b8%8a%e3%81%95%e3%81%9b%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99\/","title":{"rendered":"Java\u306e\u6587\u5b57\u5217\u7f6e\u63db\u306e\u52b9\u7387\u3092\u5411\u4e0a\u3055\u305b\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\u3002"},"content":{"rendered":"

Java\u306e\u6587\u5b57\u5217\u7f6e\u63db\u306e\u52b9\u7387\u3092\u9ad8\u3081\u308b\u305f\u3081\u306b\u3001\u4ee5\u4e0b\u306e\u70b9\u3092\u8003\u616e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n

    \n
  1. Java\u3067\u6587\u5b57\u5217\u3092\u7d50\u5408\u3059\u308b\u306b\u306f\u3001StringBuilder\u3084StringBuffer\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002String\u306f\u4e0d\u5909\u306a\u305f\u3081\u3001\u6587\u5b57\u5217\u3092\u7d50\u5408\u3059\u308b\u305f\u3073\u306b\u65b0\u3057\u3044String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u983b\u7e41\u306b\u6587\u5b57\u5217\u3092\u7d50\u5408\u3059\u308b\u5834\u5408\u306f\u3001\u52b9\u7387\u3092\u4e0a\u3052\u308b\u305f\u3081\u306b\u53ef\u5909\u306eStringBuilder\u3084StringBuffer\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n

    \u4f8b\u3048\u3070\u3001<\/p>\n

    StringBuilder sb = new StringBuilder();\r\nfor (int i = 0; i < 1000; i++) {\r\n    sb.append(\"hello\");\r\n}\r\nString result = sb.toString();\r\n<\/code><\/pre>\n
      \n
    1. \u8907\u6570\u306e\u6587\u5b57\u5217\u3092\u7f6e\u63db\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u3001\u6b63\u898f\u8868\u73fe\u3092\u4f7f\u7528\u3057\u3066\u4e00\u62ec\u7f6e\u63db\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u6587\u5b57\u5217\u3092\u8907\u6570\u56de\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3059\u308b\u8ca0\u8377\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n
      \u4f8b\u3048\u3070\u3001<\/p>\n
      String input = \"Hello world\";\r\nString result = input.replaceAll(\"l\", \"x\");\r\n<\/code><\/pre>\n
        \n
      1. indexOf\u3068substring\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u306e\u7f6e\u304d\u63db\u3048\u3092\u884c\u3046\uff1a\u7c21\u5358\u306a\u6587\u5b57\u5217\u306e\u7f6e\u304d\u63db\u3048\u3092\u884c\u3046\u5834\u5408\u306f\u3001indexOf\u3068substring\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n
        \u4f8b\u3048\u3070\u3001<\/p>\n
        String input = \"Hello world\";\r\nint index = input.indexOf(\"world\");\r\nString result = input.substring(0, index) + \"Java\";\r\n<\/code><\/pre>\n
          \n
        1. \u65b0\u3057\u3044String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u983b\u7e41\u306b\u4f5c\u6210\u3059\u308b\u306e\u3092\u907f\u3051\u3066\u304f\u3060\u3055\u3044\uff1a\u7279\u306b\u30eb\u30fc\u30d7\u5185\u3067\u6587\u5b57\u5217\u306e\u7d50\u5408\u64cd\u4f5c\u3092\u884c\u3046\u5834\u5408\u306f\u3001StringBuilder\u307e\u305f\u306fStringBuffer\u3092\u4f7f\u7528\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u3001\u65b0\u3057\u3044String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4f5c\u6210\u3092\u3067\u304d\u308b\u3060\u3051\u907f\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n
        2. StringBuilder\u306ereplace\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u7f6e\u63db\u3059\u308b\uff1areplace\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064StringBuilder\u306f\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u4f4d\u7f6e\u306b\u57fa\u3065\u3044\u3066\u6587\u5b57\u5217\u3092\u7f6e\u63db\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u7f6e\u63db\u306e\u52b9\u7387\u3092\u9ad8\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n
          For example:<\/p>\n
          \u4f8b\u3048\u3070\u3001<\/p>\n
          StringBuilder sb = new StringBuilder(\"Hello world\");\r\nsb.replace(6, 11, \"Java\");\r\nString result = sb.toString();\r\n<\/code><\/pre>\n
          \u8981\u63d0\u9ad8Java\u5b57\u7b26\u4e32\u66ff\u6362\u7684\u6548\u7387\uff0c\u5c31\u8981\u901a\u8fc7\u5408\u7406\u9009\u62e9\u5408\u9002\u7684\u5b57\u7b26\u4e32\u66ff\u6362\u65b9\u6cd5\uff0c\u907f\u514d\u9891\u7e41\u521b\u5efa\u65b0\u7684String\u5bf9\u8c61\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
          Java\u306e\u6587\u5b57\u5217\u7f6e\u63db\u306e\u52b9\u7387\u3092\u9ad8\u3081\u308b\u305f\u3081\u306b\u3001\u4ee5\u4e0b\u306e\u70b9\u3092\u8003\u616e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a Java\u3067\u6587\u5b57\u5217\u3092\u7d50\u5408\u3059\u308b\u306b\u306f\u3001StringBuilder\u3084StringBuffer\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002String\u306f\u4e0d\u5909\u306a\u305f\u3081\u3001\u6587\u5b57\u5217\u3092\u7d50\u5408 […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-17266","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\nJava\u306e\u6587\u5b57\u5217\u7f6e\u63db\u306e\u52b9\u7387\u3092\u5411\u4e0a\u3055\u305b\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\u3002 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Java\u306e\u6587\u5b57\u5217\u7f6e\u63db\u306e\u52b9\u7387\u3092\u5411\u4e0a\u3055\u305b\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\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.silicloud.com\/ja\/blog\/java\u306e\u6587\u5b57\u5217\u7f6e\u63db\u306e\u52b9\u7387\u3092\u5411\u4e0a\u3055\u305b\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u306e\u6587\u5b57\u5217\u7f6e\u63db\u306e\u52b9\u7387\u3092\u5411\u4e0a\u3055\u305b\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\u3002\" \/>\n<meta property=\"og:description\" content=\"Java\u306e\u6587\u5b57\u5217\u7f6e\u63db\u306e\u52b9\u7387\u3092\u5411\u4e0a\u3055\u305b\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u306e\u6587\u5b57\u5217\u7f6e\u63db\u306e\u52b9\u7387\u3092\u5411\u4e0a\u3055\u305b\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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