java Map集合的排序

主要map 先排序key后排序值

public static void main(String[] args) {
		
		/**
		 * 建的排序
		 */
		Map<String, String> map = new TreeMap<String,String>();
        map.put("11", "aa");
        map.put("22", "bb");
        map.put("99", "cc");
        map.put("44", "dd");
        map.put("55", "ee");
        map.put("66", "ff");
       
        for (Entry<String, String> entry : map.entrySet()){
            System.out.println("key=" + entry.getKey() +";　value : " + entry.getValue());
        }
        
        
        //Map集合的排序
        Map<String, Integer> valueCompare = new TreeMap<String, Integer>(new Comparator<String>() {//可以在这里设置key的排序需求
			@Override
			public int compare(String o1, String o2) {
				int com = o1.compareTo(o2);
				return com;
			}
        	
		});
		valueCompare.put("e", 9); 
		valueCompare.put("b", 3); 
		valueCompare.put("a", 10); 
		valueCompare.put("d", 9); 
		

		List<Map.Entry<String, Integer>> infoIds = new ArrayList<Map.Entry<String, Integer>>(valueCompare.entrySet());
		System.out.println("-------------排序前--------------");
		for (int i = 0; i < infoIds.size(); i++) {
			String id = infoIds.get(i).toString();
			System.out.println(id);
		}
		
		// 根据自己的需求排序
		Collections.sort(infoIds, new Comparator<Map.Entry<String, Integer>>() {//
			public int compare(Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2) {
				return ( o1.getValue()-o2.getValue());
			}
		});
		
		System.out.println("--------------排序后--------------");
		for (int i = 0; i < infoIds.size(); i++) {
			Entry<String,Integer> ent=infoIds.get(i);
			System.out.println(ent.getKey()+"="+ent.getValue());
		}
	}

参考：2

   public static void main(String[] args) {
		Map<String, Integer> map = new HashMap<String, Integer>();

		map.put("lisi", 5); 
		map.put("lisi1", 1); 
		map.put("lisi2", 3); 
		map.put("lisi3", 9); 

		List<Map.Entry<String, Integer>> infoIds = new   ArrayList<Map.Entry<String, Integer>>(map.entrySet());
		System.out.println("--------------排序前--------------");
		for (int i = 0; i < infoIds.size(); i++) {
			String id = infoIds.get(i).toString();
			System.out.println(id);
		}
		// 排序
		Collections.sort(infoIds, new Comparator<Map.Entry<String,        Integer>>() {
			public int compare(Map.Entry<String, Integer> o1,
					Map.Entry<String, Integer> o2) {
				return ( o1.getValue()-o2.getValue());
			}
		});

		System.out.println("--------------排序后--------------");
		for (int i = 0; i < infoIds.size(); i++) {
			Entry<String,Integer> ent=infoIds.get(i);
			System.out.println(ent.getKey()+"="+ent.getValue());
		}		
	}