使用Java 8 Stream按Map的键进行排序

使用Java 8 Stream按Map的键进行排序

public static void main(String[] args) {
            Map<Integer, String> map = new HashMap<Integer, String>();
            map.put(15, "Mahesh");
            map.put(10, "Suresh");
            map.put(30, "Nilesh");
            Map<Integer, String> map1 = new HashMap<Integer, String>();
            // 按照Map的键进行排序
            map1 = map.entrySet().stream().sorted(Map.Entry.comparingByKey())
                    .collect(Collectors.toMap
                            (Map.Entry::getKey,
                             Map.Entry::getValue,(oldVal,newVal)->oldVal, LinkedHashMap::new));

        for (Map.Entry e : map1.entrySet()){
            System.out.println("Key: " + e.getKey() + ", Value: " + e.getValue());
        }
    }

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