{"width":"100%","title":" Java Generics Hell - \u53cd\u5909\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9","image_url":null,"url":"https://nagise.hatenablog.jp/entry/20171214/1513260215","description":"Java Generics Hell \u30a2\u30c9\u30d9\u30f3\u30c8\u30ab\u30ec\u30f3\u30c0\u30fc 14\u65e5\u76ee\u3002 \u524d\u56de(13\u65e5\u76ee) \u5171\u5909\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9 \u8aad\u8005\u306e\u63a8\u5968\u30b9\u30ad\u30eb\u3068\u3057\u3066\u306fOCJP Silver\u3050\u3089\u3044\u3092\u60f3\u5b9a\u3057\u3066\u3044\u308b\u3002 \u53cd\u5909\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9 \u3055\u3066\u3001\u524d\u56de\u306f\u5171\u5909\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9\u306b\u3064\u3044\u3066\u3060\u3063\u305f\u3002\u4eca\u56de\u306f\u53cd\u5909\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9\u306b\u3064\u3044\u3066\u3067\u3042\u308b\u3002\u53cd\u5909\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9\u306f? super\u3092\u7528\u3044\u3066\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3059\u308b\u3002 List<A> listA = new ArrayList<A>(); List<? super B> listSuB = listA; // \u4ee3\u5165\u53ef\u80fd \u3053\u306elistSuB\u306f\u6b21\u306e\u3088\u3046\u306a\u6027\u8cea\u3092\u6301\u3063\u3066\u3044\u308b\u3002 listSuB \u306f B\u578b\u3092\u683c\u7d0d\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u2026","author_url":"https://blog.hatena.ne.jp/Nagise/","blog_url":"https://nagise.hatenablog.jp/","type":"rich","provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fnagise.hatenablog.jp%2Fentry%2F20171214%2F1513260215\" title=\" Java Generics Hell - \u53cd\u5909\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9 - \u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u8133\u307f\u305d\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","provider_name":"Hatena Blog","categories":["Java","Generics"],"author_name":"Nagise","published":"2017-12-14 23:03:35","version":"1.0","height":"190","blog_title":"\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u8133\u307f\u305d"}