{"image_url":"https://cdn-ak.f.st-hatena.com/images/fotolife/k/kamoi-kenichi/20260426/20260426184417.jpg","author_url":"https://blog.hatena.ne.jp/kamoi-kenichi/","blog_title":"System.out.println(\"Java\u5b66\u7fd2\u4e2d\");","type":"rich","height":"190","version":"1.0","published":"2026-03-30 20:23:09","author_name":"kamoi-kenichi","categories":["\u3010Java Silver\u5bfe\u7b56\u3011"],"width":"100%","title":"\u3010Java Silver\u5bfe\u7b56\u3011\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306b\u3064\u3044\u3066","blog_url":"https://blog.kenichikamoi.com/","url":"https://blog.kenichikamoi.com/entry/2026/03/30/202309","provider_url":"https://hatena.blog","description":"\u2705 \u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u3068\u306f Java\u3067\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u3044\u308b\u3068\u3001 if (obj instanceof Dog) { ... } \u306e\u3088\u3046\u306b\u3001\u578b\u3054\u3068\u306b\u51e6\u7406\u3092\u5206\u3051\u308b\u66f8\u304d\u65b9\u304c\u3042\u308a\u307e\u3059\u304c\u3001 \u300c\u5c11\u3057\u9762\u5012\u3060\u306a\u2026\u300d\u3068\u611f\u3058\u305f\u3053\u3068\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\uff1f \u5b9f\u306f\u3053\u306e\u66f8\u304d\u65b9\u3001 \u3082\u3063\u3068\u30b7\u30f3\u30d7\u30eb\u306b\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 \u305d\u308c\u304c\u300c\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u300d\u3067\u3059\u3002 \ud83d\udcbb \u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9 Java Silver\u306e\u56f3\u5f62\u306e\u9762\u7a4d\u3092\u6c42\u3081\u308b\u30b3\u30fc\u30c9\u3060\u3068\u5c11\u3057\u30a4\u30e1\u30fc\u30b8\u3057\u3065\u3089\u3044\u305f\u3081\u3001 \u4eca\u56de\u3082\u72ac\u30e2\u30c7\u30eb\u3067\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u3092\u8003\u3048\u3066\u307f\u307e\u3059\u3002 abstract class Dog { abstract void action(); } class ShibaDog exten\u2026","provider_name":"Hatena Blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fblog.kenichikamoi.com%2Fentry%2F2026%2F03%2F30%2F202309\" title=\"\u3010Java Silver\u5bfe\u7b56\u3011\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u306b\u3064\u3044\u3066 - System.out.println(&quot;Java\u5b66\u7fd2\u4e2d&quot;);\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>"}