{"provider_name":"Hatena Blog","image_url":null,"width":"100%","title":"Stream \u306e Collector \u898b\u76f4\u3057\u3002\u3002","author_url":"https://blog.hatena.ne.jp/posturan/","categories":["Java"],"height":"190","blog_title":"Oboe\u5439\u304d\u30d7\u30ed\u30b0\u30e9\u30de\u306e\u9ed9\u793a\u9332","url":"https://oboe2uran.hatenablog.com/entry/2021/07/01/003000","version":"1.0","description":"\u53bb\u5e74\u3001\u66f8\u3044\u305fStream \u306e\u7d42\u7aef\u51e6\u7406 Collector \u4ee5\u4e0b\u306f\u3001 \u30ea\u30b9\u30c8\u304b\u3089\u91cd\u8907\u8981\u7d20\u3092\u62bd\u51fa\u3059\u308b\u3002 - Oboe\u5439\u304d\u30d7\u30ed\u30b0\u30e9\u30de\u306e\u9ed9\u793a\u9332 \u4e26\u884cStream\u5b9f\u884c\u3067\u306f\uff2e\uff27\u3067\u3042\u308b\u306e\u3092\u53cd\u7701\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4fee\u6b63\u3059\u3079\u304d\u3067\u3059\u3002 static <T> Collector<T, Map<T, Integer>, List<T>> duplicatedList(){ return Collector.of(HashMap::new, (r, t)->r.put(t, Optional.ofNullable(r.get(t)).map(i->i+1).orElse(1)), (a1, a2)->{ a1.entry\u2026","provider_url":"https://hatena.blog","type":"rich","author_name":"posturan","blog_url":"https://oboe2uran.hatenablog.com/","published":"2021-07-01 00:30:00","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Foboe2uran.hatenablog.com%2Fentry%2F2021%2F07%2F01%2F003000\" title=\"Stream \u306e Collector \u898b\u76f4\u3057\u3002\u3002 - Oboe\u5439\u304d\u30d7\u30ed\u30b0\u30e9\u30de\u306e\u9ed9\u793a\u9332\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>"}