{"id":47288,"date":"2025-09-10T06:08:11","date_gmt":"2025-09-10T06:08:11","guid":{"rendered":"https:\/\/www.carmatec.com\/?p=47288"},"modified":"2025-09-10T06:08:32","modified_gmt":"2025-09-10T06:08:32","slug":"java%e3%82%a4%e3%83%b3%e3%82%b9%e3%82%bf%e3%83%b3%e3%82%b9%e5%a4%89%e6%95%b0%e3%82%ac%e3%82%a4%e3%83%89","status":"publish","type":"post","link":"https:\/\/www.carmatec.com\/ja\/blog\/java-instance-variables-guide-with-examples\/","title":{"rendered":"Java\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3092\u7406\u89e3\u3059\u308b\uff1a\u4f8b\u3067\u5b66\u3076\u5305\u62ec\u7684\u30ac\u30a4\u30c9"},"content":{"rendered":"
\n\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

\u6700\u3082\u4eba\u6c17\u306e\u3042\u308b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306e1\u3064\u3067\u3042\u308bJava\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\uff08OOP\uff09\u30d1\u30e9\u30c0\u30a4\u30e0\u3067\u6709\u540d\u3067\u3042\u308b\u3002Java\u306eOOP\u306e\u4e2d\u5fc3\u306b\u306f\u30af\u30e9\u30b9\u3068\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u6982\u5ff5\u304c\u3042\u308a\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u72b6\u614b\u3092\u5b9a\u7fa9\u3059\u308b\u4e0a\u3067\u6975\u3081\u3066\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f Java\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570<\/strong>, \u672c\u66f8\u3067\u306f\u3001Java \u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u57fa\u672c\u7684\u306a\u6982\u5ff5\u3067\u3042\u308b\u5ba3\u8a00\u3001\u521d\u671f\u5316\u3001\u304a\u3088\u3073\u4f7f\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3092\u901a\u3057\u3066\u3001\u305d\u306e\u5ba3\u8a00\u3001\u521d\u671f\u5316\u3001\u4f7f\u7528\u65b9\u6cd5\u3092\u63a2\u6c42\u3057\u3001\u3053\u306e\u57fa\u672c\u7684\u306a\u6982\u5ff5\u3092\u78ba\u5b9f\u306b\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002\u672c\u66f8\u306f\u3001\u521d\u5fc3\u8005\u304b\u3089\u4e2d\u7d1a\u8005\u307e\u3067\u306eJava\u958b\u767a\u8005\u3092\u5bfe\u8c61\u306b\u3001\u308f\u304b\u308a\u3084\u3059\u3055\u3068\u3001Carmatc\u306e\u3088\u3046\u306a\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3067\u5b9f\u969b\u306b\u5fdc\u7528\u3067\u304d\u308b\u3053\u3068\u306b\u91cd\u70b9\u3092\u7f6e\u3044\u3066\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u3002.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t\t\t\t\t

1.Java\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3068\u306f\uff1f<\/strong><\/h3>

Java\u3067\u306f \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570<\/strong> \u306f\u30af\u30e9\u30b9\u5185\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u5909\u6570\u3067\u3001\u30e1\u30bd\u30c3\u30c9\u3084\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3001\u30d6\u30ed\u30c3\u30af\u306e\u5916\u5074\u306b\u3042\u308b\u3002\u3053\u308c\u3089\u306e\u5909\u6570\u306f\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09\u306b\u95a2\u9023\u4ed8\u3051\u3089\u308c\u3001\u30af\u30e9\u30b9\u306e\u5404\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306e\u30b3\u30d4\u30fc\u3092\u6301\u3064\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u30ed\u30fc\u30ab\u30eb\u5909\u6570\uff08\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u5b9a\u7fa9\uff09\u3084\u9759\u7684\u5909\u6570\uff08\u30af\u30e9\u30b9\u306e\u3059\u3079\u3066\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u5171\u6709\uff09\u3068\u306f\u7570\u306a\u308a\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306f\u5404\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u56fa\u6709\u3067\u3001\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u72b6\u614b\u3084\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002.<\/p>

\u4f8b\u3048\u3070\u3001\u8eca\u3092\u8868\u3059\u30af\u30e9\u30b9\u3092\u8003\u3048\u3066\u307f\u3088\u3046\u3002\u305d\u308c\u305e\u308c\u306e\u8eca\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f \u30ab\u30e9\u30fc<\/code>, \u30e2\u30c7\u30eb<\/code>\u3001 \u305d\u3057\u3066 \u30b9\u30d4\u30fc\u30c9<\/code> \u3068\u3044\u3046\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3092\u6301\u3064\u3002\u8907\u6570\u306e\u81ea\u52d5\u8eca\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u305f\u5834\u5408\u3001\u305d\u308c\u305e\u308c\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3053\u308c\u3089\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306b\u72ec\u81ea\u306e\u5024\u3092\u4fdd\u6301\u3057\u307e\u3059\u3002.<\/p>

\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8<\/strong><\/p>

  • \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306f\u30e1\u30bd\u30c3\u30c9\u3084\u30d6\u30ed\u30c3\u30af\u306e\u4e2d\u3067\u306f\u306a\u304f\u3001\u30af\u30e9\u30b9\u306e\u4e2d\u3067\u5ba3\u8a00\u3055\u308c\u308b\u3002.<\/li>
  • \u3092\u4f7f\u7528\u3057\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3055\u308c\u308b\u3068\u304d\u306b\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002 \u65b0\u3057\u3044<\/code> \u3068\u3044\u3046\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u3042\u308b\u3002.<\/li>
  • \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3055\u308c\u308b\u3068\u304d\u306b\u7834\u68c4\u3055\u308c\u308b\u3002.<\/li>
  • \u306a\u3069\u306e\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u3092\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002 \u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u3001\u30d1\u30d6\u30ea\u30c3\u30af\u3001\u30d7\u30ed\u30c6\u30af\u30c8<\/code>, \u307e\u305f\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\uff08package-private\uff09\u3002.<\/li><\/ul>

    2.\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306e\u7279\u5fb4<\/strong><\/h3>

    \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3092\u5fb9\u5e95\u7684\u306b\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u3001\u305d\u306e\u4e3b\u306a\u7279\u5fb4\u3092\u63a2\u3063\u3066\u307f\u3088\u3046\uff1a<\/p>

    • \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u56fa\u6709<\/strong>:\u30af\u30e9\u30b9\u306e\u5404\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306e\u30b3\u30d4\u30fc\u3092\u6301\u3063\u3066\u3044\u308b\u3002\u3042\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3092\u5909\u66f4\u3057\u3066\u3082\u3001\u5225\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u540c\u3058\u5909\u6570\u306b\u306f\u5f71\u97ff\u3057\u306a\u3044\u3002.<\/li>
    • \u30c7\u30d5\u30a9\u30eb\u30c8\u5024<\/strong>:\u660e\u793a\u7684\u306b\u521d\u671f\u5316\u3055\u308c\u306a\u3044\u5834\u5408\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306b\u306f\u30c7\u30fc\u30bf\u578b\u306b\u5fdc\u3058\u305f\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u304c\u81ea\u52d5\u7684\u306b\u4ee3\u5165\u3055\u308c\u308b\uff08\u4f8b\uff0e, 0<\/code> \u306b\u3068\u3063\u3066 int, null<\/code> \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u305f\u3081\u306b\u3001, \u64ec\u4f3c<\/code> \u306b\u3068\u3063\u3066 \u30d6\u30fc\u30ea\u30a2\u30f3<\/code>).<\/li>
    • \u30b9\u30b3\u30fc\u30d7<\/strong>:\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u304c\u8a31\u53ef\u3057\u3066\u3044\u308c\u3070\u3001\u30af\u30e9\u30b9\u5185\u306e\u30e1\u30bd\u30c3\u30c9\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3001\u30d6\u30ed\u30c3\u30af\u304b\u3089\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3059\u3002.<\/li>
    • \u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50<\/strong>:\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306f \u30d1\u30d6\u30ea\u30c3\u30af\u3001\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u3001\u30d7\u30ed\u30c6\u30af\u30c8<\/code>, \u307e\u305f\u306fpackage-private\u3067\u3001\u305d\u306e\u53ef\u8996\u6027\u3068\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u3092\u5236\u5fa1\u3059\u308b\u3002.<\/li>
    • \u751f\u6daf<\/strong>:\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5b58\u5728\u3059\u308b\u9650\u308a\u5b58\u5728\u3059\u308b\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u53c2\u7167\u3055\u308c\u306a\u304f\u306a\u308b\u3068\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306f\u30ac\u30d9\u30fc\u30b8\u30fb\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u5bfe\u8c61\u3068\u306a\u308b\u3002.<\/li><\/ul>

      3.\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306e\u5ba3\u8a00<\/strong><\/h3>

      \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306f\u30af\u30e9\u30b9\u672c\u4f53\u306e\u4e2d\u3067\u5ba3\u8a00\u3055\u308c\u3001\u901a\u5e38\u306f\u30e1\u30bd\u30c3\u30c9\u3084\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u524d\u306e\u4e00\u756a\u4e0a\u3067\u5ba3\u8a00\u3055\u308c\u307e\u3059\u3002\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u69cb\u6587\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\uff1a<\/p>

      Java\naccess_modifier data_type variable_name\uff1b;<\/pre>
      \u4f8b<\/strong><\/p>
      Java\npublic class Car {\n    \/\/ \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\n    \u6587\u5b57\u5217\u30e2\u30c7\u30eb\n    int speed\uff1b\n    boolean isRunning\uff1b\n}<\/pre>
      \u3053\u306e\u4f8b\u3067\u306f<\/p>
      • \u30e2\u30c7\u30eb<\/code> \u306f \u30b9\u30c8\u30ea\u30f3\u30b0<\/code> \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3002.<\/li>
      • \u30b9\u30d4\u30fc\u30c9<\/code> \u306f \u30a4\u30f3\u30c8<\/code> \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3002.<\/li>
      • isRunning<\/code> \u306f \u30d6\u30fc\u30ea\u30a2\u30f3<\/code> \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3002.<\/li><\/ul>
        \u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u308b\uff1a<\/p>
        Java\npublic class Car {\n    private String model; \/\/ \u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\n    public int speed; \/\/ \u30d1\u30d6\u30ea\u30c3\u30af\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\n    protected boolean isRunning; \/\/ \u4fdd\u8b77\u3055\u308c\u305f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\n}<\/pre>
        • \u30d7\u30e9\u30a4\u30d9\u30fc\u30c8<\/strong>:\u30af\u30e9\u30b9\u5185\u3067\u306e\u307f\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u3002.<\/li>
        • \u30d1\u30d6\u30ea\u30c3\u30af<\/strong>:\u3069\u3053\u304b\u3089\u3067\u3082\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u3002.<\/li>
        • \u30d7\u30ed\u30c6\u30af\u30c8<\/strong>:\u540c\u3058\u30d1\u30c3\u30b1\u30fc\u30b8\u5185\u304a\u3088\u3073\u30b5\u30d6\u30af\u30e9\u30b9\u5185\u3067\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u3002.<\/li><\/ul>
          4.\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306e\u521d\u671f\u5316<\/strong><\/h3>
          \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306f\u3044\u304f\u3064\u304b\u306e\u65b9\u6cd5\u3067\u521d\u671f\u5316\u3067\u304d\u308b\uff1a<\/p>
          • \u5ba3\u8a00\u6642<\/strong>:\u5909\u6570\u306e\u5ba3\u8a00\u6642\u306b\u5024\u3092\u4ee3\u5165\u3059\u308b\u3002.<\/li>
          • \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf<\/strong>:\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210\u6642\u306b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3092\u521d\u671f\u5316\u3059\u308b\u3002.<\/li>
          • \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30fb\u30a4\u30cb\u30b7\u30e3\u30e9\u30a4\u30b6\u30fc\u30fb\u30d6\u30ed\u30c3\u30af<\/strong>:\u30d6\u30ed\u30c3\u30af\u3092\u4f7f\u3063\u3066\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3092\u521d\u671f\u5316\u3059\u308b\u3002.<\/li>
          • \u30e1\u30bd\u30c3\u30c9\u7d4c\u7531<\/strong>:\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210\u5f8c\u306b\u5024\u3092\u8a2d\u5b9a\u3059\u308b\u306b\u306f\u3001\u30bb\u30c3\u30bf\u30fc\u30fb\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002.<\/li><\/ul>
            \u4f8b\u5ba3\u8a00\u6642\u306e\u521d\u671f\u5316<\/strong><\/p>
            Java\npublic class \u8eca\n    \u6587\u5b57\u5217\u30e2\u30c7\u30eb = \"Toyota\n    int speed = 0\uff1b\n    boolean isRunning = false\uff1b\n}<\/pre>
            \u4f8b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u306e\u521d\u671f\u5316<\/strong><\/p>
            Java\npublic class Car {\n    \u6587\u5b57\u5217\u30e2\u30c7\u30eb\n    int speed\uff1b\n    boolean isRunning\uff1b\n\n    \/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n    public Car(String model, int speed, boolean isRunning) { this.model = model.\n        this.model = model\uff1b\n        this.speed = speed\uff1b\n        this.isRunning = isRunning\uff1b\n    }\n}<\/pre>
            \u4f8b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30fb\u30a4\u30cb\u30b7\u30e3\u30e9\u30a4\u30b6\u30fc\u30fb\u30d6\u30ed\u30c3\u30af<\/strong><\/p>
            Java\npublic class Car {\n    \u6587\u5b57\u5217\u30e2\u30c7\u30eb\n    int speed\uff1b\n    boolean isRunning\uff1b\n\n    \/\/ \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u521d\u671f\u5316\u30d6\u30ed\u30c3\u30af\n    {\n        model = \"Honda\"\uff1b\n        speed = 0\uff1b\n        isRunning = false\uff1b\n    }\n}<\/pre>
            \u4f8b\u30bb\u30c3\u30bf\u30fc\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528<\/strong><\/p>
            Java\npublic class Car {\n    private string model\uff1b\n    private int speed\uff1b\n    private boolean isRunning\uff1b\n\n    \/\/ \u30bb\u30c3\u30bf\u30fc\u30fb\u30e1\u30bd\u30c3\u30c9\n    public void setModel(String model) { this.model = model; \/\/ \u30bb\u30c3\u30bf\u30fc\u30e1\u30bd\u30c3\u30c9\n        this.model = model\uff1b\n    }\n}<\/pre>
            \u306e \u3053\u308c<\/code> \u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3092\u540c\u3058\u540d\u524d\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3084\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3068\u533a\u5225\u3059\u308b\u305f\u3081\u306b\u4f7f\u308f\u308c\u308b\u3002.<\/p>
            5.\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3078\u306e\u30a2\u30af\u30bb\u30b9<\/strong><\/h3>
            \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306b\u306f\u3001\u305d\u306e\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30c9\u30c3\u30c8\u6f14\u7b97\u5b50\uff08.\uff09\u5909\u6570\u304c \u30d7\u30e9\u30a4\u30d9\u30fc\u30c8<\/code>, \u30d1\u30d6\u30ea\u30c3\u30af\u30fb\u30e1\u30bd\u30c3\u30c9\uff08\u30b2\u30c3\u30bf\u30fc\u3068\u30bb\u30c3\u30bf\u30fc\uff09\u3092\u4ecb\u3057\u3066\u306e\u307f\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u3002.<\/p>
            \u4f8b<\/strong><\/p>
            Java\npublic class Car {\n    private string model\uff1b\n    private int speed\uff1b\n\n    \/\/ \u30b2\u30c3\u30bf\u30fc\n    public \u6587\u5b57\u5217 getModel() {\n        \u30e2\u30c7\u30eb\u3092\u8fd4\u3057\u307e\u3059\uff1b\n    }\n\n    \/\/ \u30bb\u30c3\u30bf\u30fc\n    public void setModel(String model) { this.model = model; \/\/ setModel()\n        this.model = model\uff1b\n    }\n}\n\npublic class Main {\n    public static void main(String[] args) { \u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3057\u307e\u3059\u3002\n        Car car = new Car()\uff1b\n        car.setModel(\"BMW\")\uff1b\n        System.out.println(\"Car Model\uff1a\" + car.getModel())\uff1b\n    }\n}<\/pre>
            \u51fa\u529b<\/strong>:<\/p>
            \u8eca\u7a2eBMW<\/p>
            6.\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3068\u4ed6\u306e\u30bf\u30a4\u30d7\u306e\u5909\u6570<\/strong><\/h3>
            \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306e\u5f79\u5272\u3092\u660e\u78ba\u306b\u3059\u308b\u305f\u3081\u306b\u3001Java\u306e\u4ed6\u306e\u30bf\u30a4\u30d7\u306e\u5909\u6570\u3068\u6bd4\u8f03\u3057\u3066\u307f\u3088\u3046\uff1a<\/p>
            \u7279\u5fb4<\/th>\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570<\/th>\u9759\u7684\u5909\u6570<\/th>\u30ed\u30fc\u30ab\u30eb\u5909\u6570<\/th><\/tr>
            \u5ba3\u8a00<\/th>\u30af\u30e9\u30b9\u5185\u90e8\u3001\u5916\u90e8\u30e1\u30bd\u30c3\u30c9<\/td>\u30af\u30e9\u30b9\u5185\u90e8\u3067 \u9759\u7684<\/code> \u30ad\u30fc\u30ef\u30fc\u30c9<\/td>\u30e1\u30bd\u30c3\u30c9\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3001\u30d6\u30ed\u30c3\u30af\u306e\u5185\u90e8<\/td><\/tr>
            \u30b9\u30b3\u30fc\u30d7<\/th>\u30af\u30e9\u30b9\u5168\u4f53\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u56fa\u6709\uff09<\/td>\u30af\u30e9\u30b9\u5168\u4f53\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u9593\u3067\u5171\u6709\uff09<\/td>\u30e1\u30bd\u30c3\u30c9\u307e\u305f\u306f\u30d6\u30ed\u30c3\u30af\u306b\u9650\u5b9a<\/td><\/tr>
            \u751f\u6daf<\/th>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5b58\u5728\u3059\u308b\u9650\u308a\u5b58\u5728\u3059\u308b<\/td>\u30af\u30e9\u30b9\u304c\u30ed\u30fc\u30c9\u3055\u308c\u3066\u3044\u308b\u9650\u308a\u5b58\u5728\u3059\u308b<\/td>\u30e1\u30bd\u30c3\u30c9\/\u30d6\u30ed\u30c3\u30af\u5b9f\u884c\u4e2d\u306b\u5b58\u5728\u3059\u308b<\/td><\/tr>
            \u30c7\u30d5\u30a9\u30eb\u30c8\u5024<\/th>\u306f\u3044\uff08\u4f8b, 0, null, false<\/code>)<\/td>\u306f\u3044\uff08\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3068\u540c\u3058\uff09<\/td>\u3044\u3044\u3048\uff08\u660e\u793a\u7684\u306b\u521d\u671f\u5316\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\uff09<\/td><\/tr>
            \u30e1\u30e2\u30ea\u5272\u308a\u5f53\u3066<\/th>\u30d2\u30fc\u30d7\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u4ed8\u304d\uff09<\/td>\u30d2\u30fc\u30d7\uff08\u30af\u30e9\u30b9\u4ed8\u304d\uff09<\/td>\u30b9\u30bf\u30c3\u30af<\/td><\/tr><\/tbody><\/table>
            \u4f8b\u5909\u6570\u578b\u306e\u6bd4\u8f03<\/strong><\/p>
            Java\npublic class Car {\n    \/\/ \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\n    private String model = \"Toyota\"\uff1b\n\n    \/\/ \u30b9\u30bf\u30c6\u30a3\u30c3\u30af\u5909\u6570\n    private static int totalCars = 0\uff1b\n\n    public Car(\u6587\u5b57\u5217\u30e2\u30c7\u30eb) { this.model = model; \/\/ \u9759\u7684\u5909\u6570\n        this.model = model\uff1b\n        totalCars++\uff1b\n    }\n\n    public void display() { \/\/ \u30ed\u30fc\u30ab\u30eb\u5909\u6570\n        \/\/ \u30ed\u30fc\u30ab\u30eb\u5909\u6570\n        int temp = 10\uff1b\n        System.out.println(\"Model: \" + model)\uff1b\n        System.out.println(\"Total Cars: \" + totalCars)\uff1b\n        System.out.println(\"Temp: \" + temp)\uff1b\n    }\n}\n\npublic class Main {\n    public static void main(String[] args) { \u6b21\u306e\u3088\u3046\u306b\u3057\u307e\u3059\u3002\n        Car car1 = new Car(\"Honda\")\uff1b\n        Car car2 = new Car(\"BMW\")\uff1b\n        car1.display()\uff1b\n        car2.display()\uff1b\n    }\n}<\/pre>
            \u51fa\u529b<\/strong>:<\/p>
            \u30e2\u30c7\u30eb\u30db\u30f3\u30c0
            \u5408\u8a082\u53f0
            \u6c17\u6e29\uff1a10
            \u30e2\u30c7\u30ebBMW
            \u5408\u8a082\u53f0
            \u6c17\u6e29\uff1a10<\/p>
            \u3053\u3053\u3060\u3088\u3001 \u30e2\u30c7\u30eb<\/code> \u306f\u305d\u308c\u305e\u308c\u56fa\u6709\u306e\u3082\u306e\u3067\u3042\u308b\u3002 \u8eca<\/code> \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u3042\u308b\u3001, \u30c8\u30fc\u30bf\u30eb\u30ab\u30fc\u30ba<\/code> \u306f\u3059\u3079\u3066\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u5171\u6709\u3055\u308c \u81e8\u6642\u8077\u54e1<\/code> \u306b\u30ed\u30fc\u30ab\u30eb\u3067\u3042\u308b\u3002 \u8868\u793a<\/code> \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3002.<\/p>
            7.\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306e\u5b9f\u4f8b<\/strong><\/h3>
            \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306e\u4f7f\u3044\u65b9\u3092\u8aac\u660e\u3059\u308b\u305f\u3081\u306b\u3001\u5b9f\u969b\u306e\u30b7\u30ca\u30ea\u30aa\u3092\u63a2\u3063\u3066\u307f\u3088\u3046\u3002.<\/p>
            \u4f8b1\uff1a\u5b66\u751f\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0<\/strong><\/p>
            Java\npublic class Student {\n    \/\/ \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\n    private String name\uff1b\n    private int rollNumber\uff1b\n    private double gpa\uff1b\n\n    \/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n    public Student(String name, int rollNumber, double gpa) { this.name = name.\n        this.name = name\uff1b\n        this.rollNumber = rollNumber\uff1b\n        this.gpa = gpa\uff1b\n    }\n\n    \/\/ \u30b2\u30c3\u30bf\u30fc\u30fb\u30e1\u30bd\u30c3\u30c9\n    public \u6587\u5b57\u5217 getName() {\n        \u540d\u524d\u3092\u8fd4\u3057\u307e\u3059\uff1b\n    }\n\n    public int getRollNumber() { \u30ed\u30fc\u30eb\u6570\u3092\u8fd4\u3059\u3002\n        rollNumber\u3092\u8fd4\u3057\u307e\u3059\uff1b\n    }\n\n    public double getGpa() {\n        gpa \u3092\u8fd4\u3057\u307e\u3059\uff1b\n    }\n\n    \/\/ \u5b66\u751f\u306e\u8a73\u7d30\u3092\u8868\u793a\u3059\u308b\u30e1\u30bd\u30c3\u30c9\n    public void displayDetails() { \u751f\u5f92\u8a73\u7d30\u3092\u8868\u793a\u3059\u308b\u30e1\u30bd\u30c3\u30c9\n        System.out.println(\"Name: \" + name)\uff1b\n        System.out.println(\"Roll Number: \" + rollNumber)\uff1b\n        System.out.println(\"GPA: \" + gpa)\uff1b\n    }\n}\n\npublic class Main {\n    public static void main(String[] args) { \/\/ \u751f\u5f92\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4f5c\u6210\n        \/\/ \u751f\u5f92\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4f5c\u6210\n        Student student1 = new Student(\"Alice\", 101, 3.8)\uff1b\n        Student student2 = new Student(\"Bob\", 102, 3.5)\uff1b\n\n        \/\/ \u8a73\u7d30\u306e\u8868\u793a\n        student1.displayDetails()\uff1b\n        student2.displayDetails()\uff1b\n    }\n}<\/pre>
            \u51fa\u529b<\/strong>:<\/p>
            \u540d\u524d\u30a2\u30ea\u30b9
            \u30ed\u30fc\u30eb\u756a\u53f7\uff1a101
            GPA: 3.8
            \u540d\u524d\u30dc\u30d6
            \u30ed\u30fc\u30eb\u756a\u53f7\uff1a102
            GPA: 3.5<\/p>
            \u3053\u306e\u4f8b\u3067\u306f\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570 (\u540d\u524d\u3001\u30ed\u30fc\u30eb\u756a\u53f7\u3001\u6210\u7e3e<\/code>)\u3054\u3068\u306b\u4e00\u610f\u306e\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3059\u308b\u3002 \u5b66\u751f<\/code> \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u3042\u308b\u3002.<\/p>
            \u4f8b2\uff1a\u9280\u884c\u53e3\u5ea7\u30b7\u30b9\u30c6\u30e0<\/strong><\/p>
            \u30b8\u30e3\u30ef\npublic class BankAccount {\n    \/\/ \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\n    private String accountHolder\uff1b\n    private double balance\uff1b\n    private int accountNumber\uff1b\n\n    \/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\n    public BankAccount(String accountHolder, int accountNumber, double initialBalance) { this.accountHolder = accountHolder.\n        this.accountHolder = accountHolder\uff1b\n        this.accountNumber = accountNumber\uff1b\n        this.balance = initialBalance\uff1b\n    }\n\n    \/\/ \u30e1\u30bd\u30c3\u30c9\n    public void deposit(double amount) { \u3082\u3057 (amount > 0)\n        if (\u91d1\u984d > 0) {\n            balance += amount\uff1b\n            System.out.println(\"Deposited: $\" + amount)\uff1b\n        }\n    }\n\n    public void withdraw(double amount) { \u3082\u3057 (amount > 0 && balance >= amount)\n        if (amount > 0 && balance >= amount) { \u6b8b\u9ad8 -= amount; \u6b8b\u9ad8 -= amount.\n            balance -= amount\uff1b\n            System.out.println(\"Withdrawn: $\" + amount)\uff1b\n        } else {\n            System.out.println(\"\u8cc7\u91d1\u4e0d\u8db3\u307e\u305f\u306f\u7121\u52b9\u306a\u91d1\u984d\u3067\u3059\u3002\")\uff1b\n        }\n    }\n\n    \u30d1\u30d6\u30ea\u30c3\u30af void displayBalance() {\n        System.out.println(\"Account Holder: \" + accountHolder)\uff1b\n        System.out.println(\"\u53e3\u5ea7\u756a\u53f7\uff1a\" + \u53e3\u5ea7\u756a\u53f7)\uff1b\n        System.out.println(\"Balance: $\" + balance)\uff1b\n    }\n}\n\npublic class Main {\n    public static void main(String[] args) { \u6b21\u306e\u3088\u3046\u306b\u3057\u307e\u3059\u3002\n        BankAccount account1 = new BankAccount(\"John Doe\", 1001, 500.0)\uff1b\n        BankAccount account2 = new BankAccount(\"Jane Smith\", 1002, 1000.0)\uff1b\n\n        account1.deposit(200.0)\uff1b\n        account1.withdraw(100.0)\uff1b\n        account1.displayBalance()\uff1b\n\n        account2.deposit(500.0)\uff1b\n        account2.withdraw(2000.0)\uff1b\n        account2.displayBalance()\uff1b\n    }\n}<\/pre>
            \u51fa\u529b<\/strong>:<\/p>
            \u9810\u3051\u3089\u308c\u305f$200.0
            \u64a4\u9000\uff1a$100.0
            \u53e3\u5ea7\u540d\u7fa9\u4eba\u30b8\u30e7\u30f3\u30fb\u30c9\u30a6
            \u53e3\u5ea7\u756a\u53f7\uff1a1001
            \u30d0\u30e9\u30f3\u30b9: $600.0
            \u9810\u3051\u5165\u308c$500.0
            \u8cc7\u91d1\u4e0d\u8db3\u307e\u305f\u306f\u7121\u52b9\u306a\u91d1\u984d\u3002.
            \u53e3\u5ea7\u540d\u7fa9\u4eba\u30b8\u30a7\u30fc\u30f3\u30fb\u30b9\u30df\u30b9
            \u53e3\u5ea7\u756a\u53f7\uff1a1002
            \u30d0\u30e9\u30f3\u30b9: $1500.0<\/p>
            \u3053\u306e\u4f8b\u3067\u306f\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u304c\u500b\u3005\u306e\u9280\u884c\u53e3\u5ea7\u306e\u72b6\u614b\u3092\u3069\u306e\u3088\u3046\u306b\u4fdd\u6301\u3059\u308b\u304b\u3092\u793a\u3057\u3066\u3044\u308b\u3002 \u30d0\u30e9\u30f3\u30b9<\/code> \u53d6\u5f15\u306b\u57fa\u3065\u3044\u3066\u3044\u308b\u3002.<\/p>
            8.\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/strong><\/h3>