{"id":1861,"date":"2026-03-25T17:36:29","date_gmt":"2026-03-25T17:36:29","guid":{"rendered":"https:\/\/www.tech-posts.com\/ja\/avoiding-common-mistakes-in-oo-modeling\/"},"modified":"2026-03-25T17:36:29","modified_gmt":"2026-03-25T17:36:29","slug":"avoiding-common-mistakes-in-oo-modeling","status":"publish","type":"post","link":"https:\/\/www.tech-posts.com\/ja\/avoiding-common-mistakes-in-oo-modeling\/","title":{"rendered":"OO\u30e2\u30c7\u30ea\u30f3\u30b0\u306b\u304a\u3051\u308b\u4e00\u822c\u7684\u306a\u30df\u30b9\u3092\u907f\u3051\u308b"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Cartoon-style infographic summarizing common Object-Oriented modeling mistakes: God Classes with too many responsibilities, fragile inheritance hierarchies, encapsulation boundaries, relationship types (Association\/Aggregation\/Composition), state management tips, and a design review checklist for building robust, maintainable software architecture\" 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src=\"https:\/\/www.tech-posts.com\/wp-content\/uploads\/2026\/03\/avoiding-oo-modeling-mistakes-infographic.jpg\"\/><\/figure>\n<\/div>\n<p>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\uff08OO\uff09\u30e2\u30c7\u30ea\u30f3\u30b0\u306f\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306e\u8a2d\u8a08\u56f3\u3068\u3057\u3066\u6a5f\u80fd\u3057\u307e\u3059\u3002\u30b3\u30fc\u30c9\u304c1\u884c\u3082\u66f8\u304b\u308c\u308b\u524d\u304b\u3089\u3001\u30c7\u30fc\u30bf\u3068\u632f\u308b\u821e\u3044\u304c\u3069\u306e\u3088\u3046\u306b\u76f8\u4e92\u4f5c\u7528\u3059\u308b\u304b\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u7d4c\u9a13\u8c4a\u5bcc\u306a\u5b9f\u8df5\u8005\u3067\u3059\u3089\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u6574\u5408\u6027\u3001\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3\u3001\u4fdd\u5b88\u6027\u3092\u640d\u306a\u3046\u7f60\u306b\u9665\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u843d\u3068\u3057\u7a74\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u3001\u5805\u7262\u306a\u30b7\u30b9\u30c6\u30e0\u3092\u69cb\u7bc9\u3059\u308b\u305f\u3081\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u30ac\u30a4\u30c9\u3067\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u5206\u6790\u3068\u8a2d\u8a08\u306b\u304a\u3051\u308b\u983b\u51fa\u306e\u8aa4\u308a\u3092\u691c\u8a0e\u3057\u307e\u3059\u3002\u30af\u30e9\u30b9\u69cb\u9020\u3001\u7d99\u627f\u968e\u5c64\u3001\u95a2\u4fc2\u6027\u306e\u5b9a\u7fa9\u306b\u3064\u3044\u3066\u63a2\u6c42\u3057\u307e\u3059\u3002\u76ee\u7684\u306f\u3001\u7279\u5b9a\u306e\u30c4\u30fc\u30eb\u3084\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306b\u4f9d\u5b58\u305b\u305a\u306b\u3001\u8a2d\u8a08\u54c1\u8cea\u3092\u5411\u4e0a\u3055\u305b\u308b\u5b9f\u884c\u53ef\u80fd\u306a\u30a4\u30f3\u30b5\u30a4\u30c8\u3092\u63d0\u4f9b\u3059\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<h2>\ud83d\udeab 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rowspan=\"1\">\n<p>\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u306e\u4f9d\u5b58\u95a2\u4fc2<\/p>\n<\/th>\n<th colspan=\"1\" rowspan=\"1\">\n<p>\u4f8b<\/p>\n<\/th>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u95a2\u9023\u6027<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u306a\u3057<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u72ec\u7acb<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u6559\u5e2b\u306f\u751f\u5f92\u306b\u6388\u696d\u3092\u884c\u3046\u3002<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u96c6\u7d04<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u5f31\u3044<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u72ec\u7acb<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u90e8\u7f72\u306b\u306f\u6559\u6388\u304c\u3044\u308b\uff08\u6559\u6388\u306f\u90e8\u7f72\u304c\u306a\u304f\u3066\u3082\u5b58\u5728\u3059\u308b\uff09\u3002<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u5408\u6210<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u5f37\u3044<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u4f9d\u5b58<\/p>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<p>\u5bb6\u306b\u306f\u90e8\u5c4b\u304c\u3042\u308b\uff08\u90e8\u5c4b\u306f\u5bb6\u3068\u3068\u3082\u306b\u6b7b\u306c\uff09\u3002<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u30e2\u30c7\u30eb\u5185\u3067\u8aa4\u3063\u305f\u95a2\u4fc2\u6027\u306e\u7a2e\u985e\u3092\u4f7f\u7528\u3059\u308b\u3068\u5b9f\u884c\u6642\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u3002\u305f\u3068\u3048\u3070\u3001\u4f9d\u5b58\u95a2\u4fc2\u3092\u95a2\u9023\u6027\u3068\u3057\u3066\u30e2\u30c7\u30eb\u5316\u3057\u305f\u5834\u5408\u3001\u89aa\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u7834\u68c4\u3055\u308c\u305f\u5f8c\u306b\u30b7\u30b9\u30c6\u30e0\u304c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002\u56f3\u304c\u610f\u56f3\u3057\u305f\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u3092\u6b63\u78ba\u306b\u53cd\u6620\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/p>\n<h2>\u2696\ufe0f \u72b6\u614b\u7ba1\u7406\u3068\u8cac\u4efb\u306e\u6240\u5728<\/h2>\n<p>\u72b6\u614b\u6a5f\u68b0\u306f\u9ad8\u30ec\u30d9\u30eb\u306a\u30e2\u30c7\u30eb\u5316\u3067\u3057\u3070\u3057\u3070\u7121\u8996\u3055\u308c\u308b\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30a4\u30d9\u30f3\u30c8\u306b\u57fa\u3065\u3044\u3066\u72b6\u614b\u3092\u5909\u5316\u3055\u305b\u308b\u3002\u9077\u79fb\u30ed\u30b8\u30c3\u30af\u304c\u8907\u6570\u306e\u30af\u30e9\u30b9\u306b\u6563\u3089\u3070\u3063\u3066\u3044\u308b\u3068\u3001\u4e00\u8cab\u6027\u3092\u7dad\u6301\u3059\u308b\u3053\u3068\u304c\u96e3\u3057\u304f\u306a\u308b\u3002<\/p>\n<ul>\n<li>\n<p><strong>\u30b9\u30d1\u30b2\u30c3\u30c6\u30a3\u30ed\u30b8\u30c3\u30af\uff1a<\/strong>\u30e1\u30bd\u30c3\u30c9\u5168\u4f53\u306b\u6563\u3089\u3070\u308b\u72b6\u614b\u306b\u95a2\u3059\u308b\u6761\u4ef6\u30c1\u30a7\u30c3\u30af\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u9077\u79fb\u306e\u6b20\u843d\uff1a<\/strong>\u72b6\u614b\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u304c\u3001\u305d\u306e\u72b6\u614b\u306b\u9032\u5165\u307e\u305f\u306f\u9000\u51fa\u3059\u308b\u6709\u52b9\u306a\u7d4c\u8def\u304c\u5b58\u5728\u3057\u306a\u3044\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u30b0\u30ed\u30fc\u30d0\u30eb\u30b9\u30c6\u30fc\u30c8\uff1a<\/strong>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5168\u4f53\u306e\u72b6\u614b\u3092\u8ffd\u8de1\u3059\u308b\u305f\u3081\u306b\u9759\u7684\u5909\u6570\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u72b6\u614b\u30ed\u30b8\u30c3\u30af\u3092\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u81ea\u4f53\u307e\u305f\u306f\u5c02\u7528\u306e\u30b9\u30c6\u30fc\u30c8\u30de\u30cd\u30fc\u30b8\u30e3\u30fc\u5185\u306b\u96c6\u4e2d\u3055\u305b\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u632f\u308b\u821e\u3044\u304c\u5c40\u6240\u5316\u3055\u308c\u308b\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u9077\u79fb\u3059\u308b\u969b\u3001\u5909\u5316\u304c\u660e\u78ba\u3067\u8ffd\u8de1\u53ef\u80fd\u306b\u306a\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u30c7\u30d0\u30c3\u30b0\u6642\u9593\u306f\u8457\u3057\u304f\u77ed\u7e2e\u3055\u308c\u308b\u3002<\/p>\n<h2>\ud83d\udcd0 \u30e2\u30c7\u30ea\u30f3\u30b0\u3068\u5b9f\u88c5\u306e\u30ae\u30e3\u30c3\u30d7<\/h2>\n<p>\u30e2\u30c7\u30eb\u304c\u5b9f\u88c5\u3068\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u3001\u3088\u304f\u3042\u308b\u4e56\u96e2\u304c\u751f\u3058\u308b\u3002\u3053\u308c\u306f\u958b\u767a\u8005\u304c\u6642\u9593\u3092\u7bc0\u7d04\u3059\u308b\u305f\u3081\u306b\u30e2\u30c7\u30ea\u30f3\u30b0\u3092\u98db\u3070\u3059\u5834\u5408\u3084\u3001\u30e2\u30c7\u30e9\u30fc\u304c\u6280\u8853\u7684\u6587\u8108\u3092\u7406\u89e3\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u306b\u8d77\u3053\u308a\u3084\u3059\u3044\u3002<\/p>\n<ul>\n<li>\n<p><strong>\u904e\u5270\u8a2d\u8a08\uff1a<\/strong>\u57fa\u672c\u7684\u306a\u95a2\u6570\u3067\u5bfe\u51e6\u3067\u304d\u308b\u5358\u7d14\u306a\u8ad6\u7406\u306b\u5bfe\u3057\u3066\u3001\u8907\u96d1\u306a\u56f3\u3092\u63cf\u304f\u3053\u3068\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u904e\u5c0f\u30e2\u30c7\u30ea\u30f3\u30b0\uff1a<\/strong>\u91cd\u8981\u306a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u5b9a\u7fa9\u3092\u98db\u3070\u3059\u3053\u3068\u306b\u3088\u308a\u3001\u5f8c\u306b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b9\u30ad\u30fc\u30de\u306e\u5909\u66f4\u3092\u4f59\u5100\u306a\u304f\u3055\u308c\u308b\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u9759\u7684 vs \u52d5\u7684\uff1a<\/strong>\u9759\u7684\u69cb\u9020\uff08\u30af\u30e9\u30b9\uff09\u306b\u306e\u307f\u6ce8\u76ee\u3057\u3001\u52d5\u7684\u632f\u308b\u821e\u3044\uff08\u30a4\u30d9\u30f3\u30c8\u306e\u9806\u5e8f\uff09\u3092\u7121\u8996\u3057\u3066\u3044\u308b\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u30d0\u30e9\u30f3\u30b9\u304c\u9375\u3067\u3042\u308b\u3002\u30e2\u30c7\u30eb\u306f\u958b\u767a\u3092\u5c0e\u304f\u306e\u306b\u5341\u5206\u306a\u8a73\u7d30\u3055\u3092\u6301\u3061\u3064\u3064\u3001\u8981\u4ef6\u306e\u5909\u5316\u306b\u5bfe\u3057\u3066\u3082\u6709\u52b9\u306a\u62bd\u8c61\u5ea6\u3092\u4fdd\u3064\u3079\u304d\u3067\u3042\u308b\u3002\u30a2\u30fc\u30ad\u30c6\u30af\u30c8\u3068\u958b\u767a\u8005\u306e\u9593\u3067\u5b9a\u671f\u7684\u306a\u30ec\u30d3\u30e5\u30fc\u304c\u3053\u306e\u30ae\u30e3\u30c3\u30d7\u3092\u57cb\u3081\u308b\u3002<\/p>\n<h2>\u2705 \u30c7\u30b6\u30a4\u30f3\u30ec\u30d3\u30e5\u30fc\u306e\u662f\u6b63\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/h2>\n<p>\u8a2d\u8a08\u3092\u6700\u7d42\u6c7a\u5b9a\u3059\u308b\u524d\u306b\u3001\u3053\u306e\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\u3092\u78ba\u8a8d\u3057\u3066\u3001\u6f5c\u5728\u7684\u306a\u69cb\u9020\u7684\u5f31\u70b9\u3092\u7279\u5b9a\u3059\u308b\u3002<\/p>\n<ul>\n<li>\n<p>\u2753 \u3059\u3079\u3066\u306e\u30af\u30e9\u30b9\u304c\u5909\u66f4\u306e\u7406\u7531\u3092\u4e00\u3064\u3060\u3051\u6301\u3063\u3066\u3044\u308b\u304b\uff1f<\/p>\n<\/li>\n<li>\n<p>\u2753 \u4f9d\u5b58\u95a2\u4fc2\u306f\u6700\u5c0f\u9650\u306b\u6291\u3048\u3089\u308c\u3001\u660e\u78ba\u306b\u3055\u308c\u3066\u3044\u308b\u304b\uff1f<\/p>\n<\/li>\n<li>\n<p>\u2753 \u7d99\u627f\u306f\u30bf\u30a4\u30d7\u306e\u7f6e\u63db\u306e\u307f\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u304b\uff1f<\/p>\n<\/li>\n<li>\n<p>\u2753 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