@Test public void group() { ABC[] types = new ABC[] { ABC.KEY, ABC.AUCTION, ABC.FASTSELLER, ABC.INFORMATION, ABC.FASTSELLER }; List<ABC> list = Arrays.asList(types); list.sort((type1, type2) -> { return Integer.compare(type1.getSort(), type2.getSort()); }); list.forEach(s -> System.out.println(s.getTypeName())); Map<String, List<ABC>> group = list.stream().collect( Collectors.groupingBy(ABC::getTypeName)); group.forEach((name, g) -> System.out.format("name %s has %s\n", name, g.stream().map(t -> t.getTypeName()) .collect(Collectors.joining(",")))); }
JDK8 stream groupBY
JDK8的stream中的groupBy 还是有点作用的, 其他的只是简洁代码
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转载自tristan-s.iteye.com/blog/2268731
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