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package com.github.javahao.util;

import java.util.*;

public class MapSort {
    /**
     * * 使用 Map按key进行排序
     * @param map 参数
     * @param  键
     * @param  值
     * @return 返回排序结果
     */
    public static  Map sortMapByKey(Map map) {
        if (map == null || map.isEmpty()) {  
            return null;  
        }  
        Map sortMap = new TreeMap(new Comparator() {
			public int compare(K o1, K o2) {
				return String.valueOf(o1).compareTo(String.valueOf(o2));
			}
		});  
        sortMap.putAll(map);  
        return sortMap;  
    }
    /** 
     * 使用 Map按value进行排序 
     * @param map 参数
     * @param  键
     * @param  值
     * @return 结果
     */  
    public static  Map sortMapByValue(Map map) {  
        if (map == null || map.isEmpty()) {  
            return null;  
        }  
        Map sortedMap = new LinkedHashMap();  
        List> entryList = new ArrayList>(map.entrySet());  
        Collections.sort(entryList, new Comparator>() {
			public int compare(Map.Entry o1, Map.Entry o2) {
				return String.valueOf(o1.getValue()).compareTo(String.valueOf(o2.getValue())); 
			}
		});  
        Iterator> iter = entryList.iterator();  
        Map.Entry tmpEntry = null;  
        while (iter.hasNext()) {  
            tmpEntry = iter.next();  
            sortedMap.put(tmpEntry.getKey(), tmpEntry.getValue());  
        }  
        return sortedMap;  
    }  
}