Java Map 按Key排序和按Value排序【转】【补】

方式一

package kingtool.sort;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import java.util.Map.Entry;

/**
 * 
 * @author King
 *
 */
public class MapSortTool {

    public static void main(String[] args) {

        Map<String, String> map = new TreeMap<String, String>();
        map.put("4", "2");
        map.put("1", "1");
        map.put("9", "3");
        map.put("8", "6");

//         Map<String, String> resultMap = sortMapByKey(map); //按Key进行排序
        Map<String, String> resultMap = sortMapByValue(map); // 按Value进行排序

        for (Map.Entry<String, String> entry : resultMap.entrySet()) {
            System.out.println(entry.getKey() + " " + entry.getValue());
        }
    }

    /**
     * 使用 Map按key进行排序
     * 
     * @param map
     * @return
     */
    public static Map<String, String> sortMapByKey(Map<String, String> map) {
        if (map == null || map.isEmpty()) {
            return null;
        }
        Map<String, String> sortMap = new TreeMap<String, String>(new MapKeyStringComparator());
        sortMap.putAll(map);
        return sortMap;
    }

    /**
     * 使用 Map按value进行排序
     * 
     * @param map
     * @return
     */
    public static Map<String, String> sortMapByValue(Map<String, String> oriMap) {
        if (oriMap == null || oriMap.isEmpty()) {
            return null;
        }
        Map<String, String> sortedMap = new LinkedHashMap<String, String>();
        List<Map.Entry<String, String>> entryList = new ArrayList<Map.Entry<String, String>>(oriMap.entrySet());
        Collections.sort(entryList, new MapValueStringComparator());

        Iterator<Map.Entry<String, String>> iter = entryList.iterator();
        Map.Entry<String, String> tmpEntry = null;
        while (iter.hasNext()) {
            tmpEntry = iter.next();
            sortedMap.put(tmpEntry.getKey(), tmpEntry.getValue());
        }
        return sortedMap;
    }

    /**
     * string key升序
     * @author King
     *
     */
    static class MapKeyStringComparator implements Comparator<String>{

        @Override
        public int compare(String str1, String str2) {
            return str1.compareTo(str2);
        }
    }
    
    /**
     * string value升序
     * @author King
     *
     */
    static class MapValueStringComparator implements Comparator<Map.Entry<String, String>> {

        @Override
        public int compare(Entry<String, String> entry1, Entry<String, String> entry2) {
            return entry1.getValue().compareTo(entry2.getValue());
        }
    }
    
    
    /**
     * tip: 样例中没用到<br/>
     * double value降序
     * @author King
     *
     */
    static class MapValueNumberComparator implements Comparator<Map.Entry<String, Double>> {

        @Override
        public int compare(Entry<String, Double> entry1, Entry<String, Double> entry2) {
            return entry1.getValue().compareTo(entry2.getValue());
        }
    }
}

 

方式二

package com.rosellete.iescp;

import com.alibaba.fastjson.JSONObject;

import java.util.*;
public class SortDemo {

	public static void main(String[] args) {
		String A = "{\n" +
				"  \"phone\": \"13777777777\",\n" +
				"  \"type\": \"1\",\n" +
				"  \"ob\": \"orderDetail\",\n" +
				"  \"token\": \"aaa\",\n" +
				"  \"id\": \"13457aeewer\",\n" +
				"  \"orderId\": \"33023423\",\n" +
				"  \"timestamp\": \"2024-03-19 01:02:03\",\n" +
				"  \"sign\": \"aabe332p34\"\n" +
				"}";
		JSONObject jsonObject = JSONObject.parseObject(A);
		Collection<String> keyset = jsonObject.keySet();
		List<String> list = new ArrayList<String>(keyset);
		Collections.sort(list);
		Map<String, Object> objectObjectHashMap = new LinkedHashMap<>();
		for (int i = 0; i < list.size(); i++) {
			objectObjectHashMap.put(list.get(i), jsonObject.get(list.get(i)));
			System.out.println("key键---值:" + list.get(i) + "," + jsonObject.get(list.get(i)));
		}
		objectObjectHashMap.forEach((s, o) -> System.out.println("key = "+s + " ; value = " + o));
	}
}

 

 

 

引用自：http://www.cnblogs.com/zhujiabin/p/6164826.html

还参考：Java中Map根据键值(key)或者值(value)进行排序实现