javaList＜Map＜String, Object＞＞升序降序

Posted 2022-08-13 java李杨勇

降序：

 static class MapComparatorDesc implements Comparator<Map<String, Object>> 
        @Override
        public int compare(Map<String, Object> m1, Map<String, Object> m2) 
            Double v1 = Double.valueOf(m1.get("avgScore").toString());
            Double v2 = Double.valueOf(m2.get("avgScore").toString());
            if (v2 != null) 
                return v2.compareTo(v1);
            
            return 0;
        
    

升序：

static class MapComparatorAsc implements Comparator> 

@Override

public int compare(Map m1, Map m2) 

Doublev1 = Double.valueOf(m1.get("avgScore").toString());

Doublev2 = Double.valueOf(m2.get("avgScore").toString());

if(v1 != null)

return v1.compareTo(v2);

使用：

Collections.sort(mapList, new MapComparatorDesc());