根据value排序

List<String> items = Arrays.asList("apple", "apple", "banana", "apple", "orange", "banana", "papaya"); Map<String, Long> result = items.stream().collect( Collectors.groupingBy( Function.identity(), Collectors.counting() ) ); Map<String, Long> finalMap = new LinkedHashMap<>(); //Sort a map and add to finalMap result.entrySet().stream() .sorted(Map.Entry.<String, Long>comparingByValue() .reversed()).forEachOrdered(e -> finalMap.put(e.getKey(), e.getValue())); System.out.println(finalMap);

<span style="color:#999999">根据key排序</span>

Map<String,String> result=new HashMap<>(); result.put("13", "derek"); result.put("37","dad"); result.put("22","mom");  Map<String, String> finalMap = new LinkedHashMap<>();  //Sort a map and add to finalMap result.entrySet().stream() .sorted(Map.Entry.<String, String>comparingByKey() .reversed()).forEachOrdered(e -> finalMap.put(e.getKey(), e.getValue()));  System.out.println(finalMap);

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升序

Map<String, String> finalMap = new TreeMap<>();