Java8使用Stream对Map排序

        HashMap<String, Long> map = new HashMap<>();
        map.put("a", 10L);
        map.put("b", 20L);
        map.put("c", 15L);
        map.put("d", 23L);

        System.out.println("----Before Sort-----");
        map.forEach((k, v) -> {
            System.out.println(k + " = " + v);
        });

        Map<String, Long> finalMap = new LinkedHashMap<>();

        map.entrySet().stream()
                .sorted(Map.Entry.<String, Long> comparingByValue().reversed())
                .forEachOrdered(e -> finalMap.put(e.getKey(), e.getValue()));

        System.out.println("----After Sort-----");
        finalMap.forEach((k, v) -> {
            System.out.println(k + " = " + v);
        });
            

来源：oschina

链接：https://my.oschina.net/u/575679/blog/1563061