map按值排序

package com.zhilei.test;

import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;

public class mapValueCompareSort {
    public static void main(String[] args) {

        HashMap<String, Double> mapDesc = new HashMap<String, Double>();
        ValueComparator bvcDESC = new ValueComparator(mapDesc);
        TreeMap<String, Double> sorted_map_Desc = new TreeMap<String, Double>(bvcDESC);

        mapDesc.put("A", 99.5);
        mapDesc.put("B", 67.4);
        mapDesc.put("C", 67.4);
        mapDesc.put("D", 67.3);
        mapDesc.put("E", 11.0);
        mapDesc.put("F", -0.1);
        mapDesc.put("G", 0.1);
        mapDesc.put("H", -99.1);

        sorted_map_Desc.putAll(mapDesc);

        System.out.println("降序=====results: " + sorted_map_Desc);

        HashMap<String, Double> mapAsc = new HashMap<String, Double>();
        ValueComparatorAsc bvcAsc = new ValueComparatorAsc(mapAsc);
        TreeMap<String, Double> sorted_mapAsc = new TreeMap<String, Double>(bvcAsc);

        mapAsc.put("宽", 99.5);
        mapAsc.put("B", 67.4);
        mapAsc.put("C", 67.4);
        mapAsc.put("D", 67.3);
        mapAsc.put("r", 11.0);
        mapAsc.put("rt", -0.1);
        mapAsc.put("ee", 0.1);
        mapAsc.put("cc", -99.1);

        System.out.println("升序====unsorted map: " + mapAsc);

        sorted_mapAsc.putAll(mapAsc);

        System.out.println("升序====results: " + sorted_mapAsc);

    }
}

class ValueComparator implements Comparator<String> {
    Map<String, Double> base;

    public ValueComparator(Map<String, Double> base) {
        this.base = base;
    }

    public int compare(String a, String b) {
        if (base.get(a) >= base.get(b)) {
            return -1;
        } else {
            return 1;
        }
    }
}

class ValueComparatorAsc implements Comparator<String> {
    Map<String, Double> base;

    public ValueComparatorAsc(Map<String, Double> base) {
        this.base = base;
    }

    public int compare(String a, String b) {
        if (base.get(a) <= base.get(b)) {
            return -1;
        } else {
            return 1;
        }
    }

}