{"categories":["Java"],"version":"1.0","provider_url":"https://hatena.blog","author_name":"yohhoy","blog_title":"yohhoy\u306e\u65e5\u8a18","height":"190","width":"100%","url":"https://yohhoy.hatenadiary.jp/entry/20160913/p1","published":"2016-09-13 00:00:00","image_url":null,"description":"Java\u8a00\u8a9e\u306e\u30b8\u30a7\u30cd\u30ea\u30af\u30b9(generics)\u3067\u306f\u3001\u578b\u63a8\u8ad6\u904e\u7a0b\u306b\u304a\u3044\u3066\u7121\u9650\u578b(infinite type)\u304c\u63a8\u8ad6\u3055\u308c\u3046\u308b\u3002\u305f\u3060\u3057Java\u8a00\u8a9e\u3067\u306f\u7121\u9650\u578b\u3092\u8868\u73fe\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u975e\u5883\u754c\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9(unbounded wildcard) <?> \u3092\u7528\u3044\u305f\u518d\u5e30\u578b(recursive type)\u3067\u4ee3\u66ff\u3055\u308c\u308b\u3002\u4e0b\u8a18\u30b3\u30fc\u30c9\u306e\u6761\u4ef6\u6f14\u7b97\u5b50(?:)\u3092\u7528\u3044\u305f\u6761\u4ef6\u5f0f\u2605\u306b\u304a\u3044\u3066\u3001\u30aa\u30da\u30e9\u30f3\u30c9\u578b List<Integer> \u304a\u3088\u3073 List<Double> \u304b\u3089\u5f0f\u5168\u4f53\u306e\u578b\u63a8\u8ad6\u304c\u884c\u308f\u308c\u308b\u3002\u3053\u306e\u3068\u304d\u63a8\u8ad6\u3055\u308c\u308b\u578b\u306f lub(List<Integer>, List<Double>) = List<Number & Comparab\u2026","title":"\u578b\u63a8\u8ad6\u3068\u7121\u9650\u578b(infinite type)","blog_url":"https://yohhoy.hatenadiary.jp/","provider_name":"Hatena Blog","author_url":"https://blog.hatena.ne.jp/yohhoy/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fyohhoy.hatenadiary.jp%2Fentry%2F20160913%2Fp1\" title=\"\u578b\u63a8\u8ad6\u3068\u7121\u9650\u578b(infinite type) - yohhoy\u306e\u65e5\u8a18\" 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"}