{"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fanton0825.hatenablog.com%2Fentry%2F2015%2F10%2F14%2F000000\" title=\"\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u542b\u3080Cast\u3067\u300cType safety: Unchecked cast from\u300d\u8b66\u544a\u304c\u51fa\u305f\u3089\u6291\u6b62\u3059\u308b - \u65e5\u3005\u7cbe\u9032\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","type":"rich","blog_title":"\u65e5\u3005\u7cbe\u9032","author_name":"anton0825","blog_url":"https://anton0825.hatenablog.com/","author_url":"https://blog.hatena.ne.jp/anton0825/","provider_url":"https://hatena.blog","published":"2015-10-14 00:00:00","description":"Unchecked cast\u8b66\u544a\u304c\u51fa\u305f\u3089\u666e\u901a\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306binstanceof\u3067\u578b\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304b\u3089Cast\u3059\u308b\u3088\u3046\u4fee\u6b63\u3059\u308b\u3002 if (obj instanceof String) { return (String) obj; } \u3067\u3082\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u5f8c\u306b\u6d88\u3048\u308b\u306e\u3067instanceof\u3067\u53b3\u5bc6\u306b\u578b\u30c1\u30a7\u30c3\u30af\u3067\u304d\u306a\u3044 if (obj instanceof List<String>) { // \u3053\u308c\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308b\u3002List<?>\u306a\u3089\u30b3\u30f3\u30d1\u30a4\u30eb\u901a\u308b\u3051\u3069\u3001\u305d\u308c\u3067\u306fList\u578b\u3067\u3042\u308b\u3053\u3068\u3057\u304b\u308f\u304b\u3089\u306a\u3044\u306e\u3067\u3001\u5fc5\u305a\u3057\u3082List<String>\u306bCast\u51fa\u6765\u306a\u3044\u306e\u3067\u3042\u3093\u307e\u308a\u610f\u5473\u306a\u3044 return (\u2026","width":"100%","url":"https://anton0825.hatenablog.com/entry/2015/10/14/000000","title":"\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u542b\u3080Cast\u3067\u300cType safety: Unchecked cast from\u300d\u8b66\u544a\u304c\u51fa\u305f\u3089\u6291\u6b62\u3059\u308b","height":"190","categories":["Java"],"image_url":null,"version":"1.0","provider_name":"Hatena Blog"}