{"id":502,"date":"2022-12-01T06:47:24","date_gmt":"2022-11-30T21:47:24","guid":{"rendered":"https:\/\/sheltie-garage.xyz\/tech\/?p=502"},"modified":"2022-12-01T06:47:28","modified_gmt":"2022-11-30T21:47:28","slug":"java%e3%81%a7%e7%8b%ac%e8%87%aa%e3%81%aetostring%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%82%92%e4%bd%9c%e3%81%a3%e3%81%a6%e3%81%bf%e3%82%8b","status":"publish","type":"post","link":"https:\/\/sheltie-garage.xyz\/tech\/2022\/12\/java%e3%81%a7%e7%8b%ac%e8%87%aa%e3%81%aetostring%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e3%82%92%e4%bd%9c%e3%81%a3%e3%81%a6%e3%81%bf%e3%82%8b\/","title":{"rendered":"Java\u3067\u72ec\u81ea\u306eToString\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u3063\u3066\u307f\u308b"},"content":{"rendered":"\n

Java\u306eClass\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5229\u7528\u3057\u3066\u3001private\u5ba3\u8a00\u3055\u308c\u305f\u30e1\u30f3\u30d0\u30fc\u5909\u6570\u306e\u5024\u3092\u5217\u6319\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u308a\u307e\u3059\u3002
lombok\u306e@ToString<\/a>\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u3088\u3046\u306a\u30a4\u30e1\u30fc\u30b8\u3067\u3059<\/p>\n\n\n\n

\u306a\u305c\u3059\u3067\u306b\u3042\u308b\u3082\u306e\u3092\u4f5c\u308b\u306e\u304b\uff1f<\/h3>\n\n\n\n

lombok\u3067\u6e96\u5099\u3055\u308c\u3066\u3044\u308b\u306a\u3089lombok\u4f7f\u3048\u3070\u3044\u3044\u3058\u3083\u306a\u3044\uff1f\u3068\u306a\u308a\u307e\u3059\u304c\u3001\u81ea\u4f5c\u3059\u308b\u7406\u7531\u306f\u3044\u304b\u306b\u306a\u308a\u307e\u3059
\u30fb\u4eca\u5f93\u4e8b\u3057\u3066\u3044\u308b\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u5c0e\u5165\u304c\u3081\u3093\u3069\u304f\u3055\u305d\u3046(\u7ba1\u7406\u9762\u3067)
\u30fb\u7d14\u7c8b\u306bJava\u52c9\u5f37\u306e\u305f\u3081<\/p>\n\n\n\n

lombok\u304c\u5229\u7528\u3067\u304d\u308b\u306a\u3089\u3001lombok\u3092\u5229\u7528\u3059\u308b\u306e\u304c\u826f\u3044\u3068\u601d\u3044\u307e\u3059<\/p>\n\n\n\n

\u5b9f\u73fe\u65b9\u6cd5<\/h2>\n\n\n\n

\u5177\u4f53\u7684\u306a\u30bd\u30fc\u30b9\u306fGitHub<\/a>\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044
\u4ee5\u964d\u306f\u30dd\u30a4\u30f3\u30c8\u306b\u306a\u308b\u70b9\u3092\u8a18\u8f09\u3057\u307e\u3059<\/p>\n\n\n\n

\u30d7\u30ed\u30b0\u30e9\u30e0\u5168\u6587<\/h2>\n\n\n\n
package org.example;\n\nimport java.lang.reflect.Field;\nimport java.util.Optional;\n\npublic class Util {\n\n    public static String myToString(Object obj) {\n\n        StringBuilder sb = new StringBuilder();\n        try {\n            StringBuilder innerSb = new StringBuilder();\n            for(Field a : obj.getClass().getDeclaredFields()){\u3000\u30fb\u30fb\u30fb\u2460\n                Field field = obj.getClass().getDeclaredField(a.getName());\n                field.setAccessible(true);\u3000\u30fb\u30fb\u30fb\u2461\n\n                innerSb.append(a.getName()).append(" = ").append(field.get(obj)).append(",");\u3000\u30fb\u30fb\u30fb\u2462\n            }\n\n            String str = Optional.ofNullable(innerSb.toString())\n                    .filter(s -> s.length() != 0)\n                    .map(s -> s.substring(0, s.length() - 1))\n                    .orElse("");\u3000\u30fb\u30fb\u30fb\u2463\n\n            sb.append(obj.getClass().getName()).append("(");\n            sb.append(str);\n            sb.append(")");\n        } catch(Exception e) {\n            System.out.println(e.getMessage());\n        }\n\n        return sb.toString();\n    }\n}<\/code><\/pre><\/div>\n\n\n\n
\u2460\u30fb\u30fb\u30fbClass\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u300cgetDeclaredFields\u300d\u3092\u5229\u7528\u3057\u3066\u30e1\u30f3\u30d0\u30fc\u5909\u6570\u540d\u4e00\u89a7\u3092\u53d6\u5f97\u3057\u30eb\u30fc\u30d7\u3057\u307e\u3059
\u2461\u30fb\u30fb\u30fb\u300cfield.setAccessible(true)\u300d\u3067private\u30e1\u30bd\u30c3\u30c9\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u3088\u3046\u306b\u8a2d\u5b9a\u3057\u307e\u3059
\u2462\u30fb\u30fb\u30fb\u300cfield.get(obj)\u300d\u3092\u5229\u7528\u3057\u3066\u5909\u6570\u306e\u5024\u3092\u51fa\u529b\u3057\u307e\u3059
\u2463\u30fb\u30fb\u30fb\u30ed\u30b0\u51fa\u529b\u6642\u306b\u4ed8\u4e0e\u3055\u308c\u308b\u4f59\u8a08\u306a\u30ab\u30f3\u30de\u3092\u524a\u9664\u3059\u308b\u51e6\u7406\u3067\u3059\u3002\u4ed6\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u4f9d\u5b58\u3059\u308b\u306e\u304c\u4f55\u3068\u306a\u304f\u5acc\u3060\u3063\u305f\u306e\u3067\u3001\u3053\u306e\u3088\u3046\u306a\u51e6\u7406\u306b\u306a\u3063\u3066\u3044\u307e\u3059<\/p>\n\n\n\n
\u5909\u6570\u306e\u4e2d\u8eab\u3092\u5217\u6319\u3057\u305f\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u3053\u306e\u5909\u6570\u306b\u5f15\u6570\u3068\u3057\u3066\u6e21\u3057\u3066\u3084\u308c\u3070\u3001\u5909\u6570\u3092\u5217\u6319\u3057\u305f\u6587\u5b57\u5217\u3092\u8fd4\u5374\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u4ee5\u4e0a<\/h2>\n\n\n\n
\u81ea\u5bb6\u88fd\u306eToString\u51e6\u7406\u306e\u7d39\u4ecb\u3067\u3057\u305f\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u5229\u70b9\u306fJava\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u307f\u5229\u7528\u3057\u3066\u3044\u308b\u306e\u3067\u5c0e\u5165\u304c\u7c21\u5358\u306a\u70b9\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n\n\n\n
Java\u306f\u9577\u5e74\u4f7f\u3063\u3066\u304d\u305f\u3068\u601d\u3063\u3066\u3044\u307e\u3057\u305f\u304c\u3001\u307e\u3060\u307e\u3060\u77e5\u3089\u306a\u3044\u3053\u3068\u3082\u591a\u304f\u65b0\u3057\u3044\u767a\u898b\u304c\u3042\u308b\u8a00\u8a9e\u3067\u3059\u3002
\u30ea\u30ea\u30fc\u30b9\u30b5\u30a4\u30af\u30eb\u3082\u65e9\u307e\u3063\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u9032\u5316\u306b\u3064\u3044\u3066\u3044\u3051\u308b\u304b\u3061\u3087\u3063\u3068\u5fc3\u914d\u3067\u3059\u306d\u30fb\u30fb\u30fb<\/p>\n\n\n
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\n\t\t\t\t\t\t\t\t\tEffective Java [ Joshua Bloch ]<\/a>\t\t\t\t\t\t\t<\/div>\n\t\t\t
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created by Rinker<\/a><\/div>\n\t\t\t\t\t\t\t\t\t\t
\n\t\t\t\t\t\t\t\u00a54,400<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t(2026\/04\/15 10:32:49\u6642\u70b9 \u697d\u5929\u5e02\u5834\u8abf\u3079-<\/span>\u8a73\u7d30)<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t