{"provider_name":"Hatena Blog","author_url":"https://blog.hatena.ne.jp/ky_yk_d/","blog_url":"https://ky-yk-d.hatenablog.com/","categories":["\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0"],"title":"Scala\u3068Java\u306b\u304a\u3051\u308b\u5909\u4f4d\u6307\u5b9a\u3068\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u5883\u754c","published":"2019-05-18 06:18:48","provider_url":"https://hatena.blog","width":"100%","url":"https://ky-yk-d.hatenablog.com/entry/2019/05/18/061848","description":"Scala\u306e\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u306e\u52c9\u5f37\u3067\u3001\u7c21\u5358\u306a\u30ea\u30b9\u30c8\u3092\u5b9f\u88c5\u3057\u3066\u307f\u3088\u3046\uff01\u3068\u3044\u3046\u3082\u306e\u304c\u51fa\u3066\u304d\u305f\u3002 \u8a73\u7d30\u306f\u7701\u304f\u304c\u3001\u30ea\u30b9\u30c8\u306eadd()\u30e1\u30bd\u30c3\u30c9\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5ba3\u8a00\u3055\u308c\u308b\u3002 /* Scala */ abstract class SimpleList[+A] { def add[B >: A](element: B): SimpleList[B] } \u3053\u3053\u3067\u3001\u30af\u30e9\u30b9\u306e\u578b\u306e\u5909\u4f4d\u306e\u6307\u5b9a\u3068\u3057\u3066+A\u3001\u3064\u307e\u308a\u5171\u5909\uff08covariant\uff09\u3067\u3042\u308b\u3053\u3068\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u308b\u3002\u307e\u305f\u3001add()\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u3001\u5883\u754c\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u3088\u3063\u3066\u5bfe\u8c61\u306e\u578b\uff08A\uff09\u304a\u3088\u3073\u305d\u306e\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\uff08B\uff09\u3092\u5f15\u6570\u306b\u53d6\u308a\u3001\u307e\u305f\u623b\u308a\u5024\u306f\u305d\u306e\u578b\u306e\u30ea\u30b9\u30c8\u3068\u306a\u308b\u3053\u3068\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u308b\u2026","author_name":"ky_yk_d","image_url":null,"height":"190","blog_title":"\u3053\u307e\u3076\u308d","type":"rich","version":"1.0","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fky-yk-d.hatenablog.com%2Fentry%2F2019%2F05%2F18%2F061848\" title=\"Scala\u3068Java\u306b\u304a\u3051\u308b\u5909\u4f4d\u6307\u5b9a\u3068\u578b\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u5883\u754c - \u3053\u307e\u3076\u308d\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>"}