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  • java Map根据value排序

    通用方法

    public class MapUtil {
        public static <K, V extends Comparable<? super V>> Map<K, V> sortByValue(Map<K, V> map) {
            List<Map.Entry<K, V>> list = new LinkedList<Map.Entry<K, V>>(map.entrySet());
            Collections.sort(list, new Comparator<Map.Entry<K, V>>() {
                public int compare(Map.Entry<K, V> o1, Map.Entry<K, V> o2) {
                    return (o1.getValue()).compareTo(o2.getValue());
                }
            });
    
            Map<K, V> result = new LinkedHashMap<K, V>();
            for (Map.Entry<K, V> entry : list) {
                result.put(entry.getKey(), entry.getValue());
            }
            return result;
        }
    }
    

    java7

    public static <K, V extends Comparable<? super V>> Map<K, V> sortByValue(Map<K, V> map) {
            List<Map.Entry<K, V>> list = new LinkedList<>(map.entrySet());
            Collections.sort(list, new Comparator<Map.Entry<K, V>>() {
                @Override
                public int compare(Map.Entry<K, V> o1, Map.Entry<K, V> o2) {
                    return (o1.getValue()).compareTo(o2.getValue());
                }
            });
    
            Map<K, V> result = new LinkedHashMap<>();
            for (Map.Entry<K, V> entry : list) {
                result.put(entry.getKey(), entry.getValue());
            }
            return result;
        }
    

    java8

     public static <K, V extends Comparable<? super V>> Map<K, V> sortByValue(Map<K, V> map) {
            Map<K, V> result = new LinkedHashMap<>();
            Stream<Entry<K, V>> st = map.entrySet().stream();
    
            st.sorted(Comparator.comparing(e -> e.getValue())).forEach(e -> result.put(e.getKey(), e.getValue()));
    
            return result;
        }
    

      

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  • 原文地址:https://www.cnblogs.com/binz/p/6671917.html
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