{"provider_name":"Hatena Blog","description":"\u8d85\u304c\u3064\u304f\u5c0f\u30cd\u30bf\u3002\u3088\u304f\u5fd8\u308c\u308b\u306e\u3067\u30d6\u30ed\u30b0\u5316\u3002 \u74b0\u5883 Java 15 \u7d50\u8ad6 Optional\u578b\u306eofNullable\u30e1\u30bd\u30c3\u30c9\u3067Null\u3067\u3082\u554f\u984c\u306a\u304f\u51e6\u7406\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u3002 \u305d\u306e\u3042\u3068\u3001Stream API\u306eflatMap\u30e1\u30bd\u30c3\u30c9\u3068Collection\u578b\u306estream\u30e1\u30bd\u30c3\u30c9\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3002 Optional.ofNullable(detail) // Optional<List<Class>> .stream() // Stream<List<Class>> .flatMap(Collection::stream) // Stream<Class> ... // \u4ee5\u964d\u306f\u666e\u6bb5\u901a\u308a\u306eStream\u51e6\u7406\u3092\u3059\u308b \u2026","provider_url":"https://hatena.blog","author_name":"nainaistar","image_url":"https://cdn-ak.f.st-hatena.com/images/fotolife/n/nainaistar/20201013/20201013111905.png","height":"190","version":"1.0","width":"100%","url":"https://nainaistar.hatenablog.com/entry/2021/04/10/120000","blog_title":"\u304d\u308a\u4e38\u306e\u6280\u8853\u65e5\u8a18","title":"Java\u3067Null\u3092\u610f\u8b58\u305b\u305a\u306bNullable\u306a\u914d\u5217\u9805\u76ee\u3092Stream API\u3067\u51e6\u7406\u3059\u308b","categories":["Java"],"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fnainaistar.hatenablog.com%2Fentry%2F2021%2F04%2F10%2F120000\" title=\"Java\u3067Null\u3092\u610f\u8b58\u305b\u305a\u306bNullable\u306a\u914d\u5217\u9805\u76ee\u3092Stream API\u3067\u51e6\u7406\u3059\u308b - \u304d\u308a\u4e38\u306e\u6280\u8853\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>","published":"2021-04-10 12:00:00","blog_url":"https://nainaistar.hatenablog.com/","type":"rich","author_url":"https://blog.hatena.ne.jp/nainaistar/"}