{"categories":["java"],"published":"2017-10-26 08:00:00","author_name":"mike_neck","provider_name":"Hatena Blog","height":"190","title":"\u6628\u65e5\u66f8\u3044\u305f\u30c0\u30e1\u306a\u30b3\u30fc\u30c9","blog_title":"mike-neck\u306e\u30d6\u30ed\u30b0","blog_url":"https://mike-neck.hatenadiary.com/","url":"https://mike-neck.hatenadiary.com/entry/2017/10/26/080000","description":"\u30d2\u30c9\u30a4\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u305f\u306e\u3067\u5fd8\u308c\u306a\u3044\u3088\u3046\u306b\u30e1\u30e2\u3063\u3066\u304a\u304f(\u5fd8\u308c\u306a\u3044\u3068\u306f\u8a00\u3063\u3066\u306a\u3044) \u524d\u63d0 Java7 guava18.0 \u4f7f\u7528 \u3084\u308a\u305f\u3044\u3053\u3068 Optional \u306e\u4e2d\u306e\u5024\u306b\u5bfe\u3057\u3066 filter \u3057\u3066 isPresent \u306e\u7d50\u679c\u304c\u307b\u3057\u3044 \u66f8\u3044\u305f\u30b3\u30fc\u30c9 \u4f8b\uff1a Optional<Integer> \u306b\u5bfe\u3057\u3066 value > 0 \u306e filter \u3092\u304b\u3051\u308b final Optional<Integer> object = ...; final boolean result = object.transform(new Function<Integer, Optional<Integer>>() { @Overr\u2026","version":"1.0","provider_url":"https://hatena.blog","width":"100%","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmike-neck.hatenadiary.com%2Fentry%2F2017%2F10%2F26%2F080000\" title=\"\u6628\u65e5\u66f8\u3044\u305f\u30c0\u30e1\u306a\u30b3\u30fc\u30c9 - mike-neck\u306e\u30d6\u30ed\u30b0\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","image_url":null,"type":"rich","author_url":"https://blog.hatena.ne.jp/mike_neck/"}