对Map中数据，按value值排序方法

1 Map<String,Integer>>类型

       <pre><code>
        //声明
        Map<String,Integer> hashMap = new HashMap<String,Integer>();
	//向Map中添加数据
	//.....
	//转换
	ArrayList<Entry<String, Integer>> arrayList = new ArrayList<Entry<String, Integer>>(
				hashMap.entrySet());
	//排序
	Collections.sort(arrayList, new Comparator<Map.Entry<String, Integer>>() {
		public int compare(Map.Entry<String, Integer> map1,
					Map.Entry<String, Integer> map2) {
			return (map2.getValue() - map1.getValue());
		}
	});
	//输出
	for (Entry<String, Integer> entry : arrayList) {
		System.out.println(entry.getKey() + "\t" + entry.getValue());
	}
         </code></pre>

2 Map<String,Float>类型

                //声明
		Map hashMap = new HashMap();
		//向Map中添加数据
		//.....
		//转换
		ArrayList> arrayList = new ArrayList>(hashMap.entrySet());
		//排序
		Collections.sort(arrayList, new Comparator>(){
			public int compare(Map.Entry map1,
					Map.Entry map2) {
				return ((map2.getValue() - map1.getValue() == 0) ? 0
						: (map2.getValue() - map1.getValue() > 0) ? 1
								: -1);
			}
		});
		//输出
		for (Entry entry : arrayList) {
			System.out.println(entry.getKey() + "\t" + entry.getValue());
		}

3 Map<String,Double>类型

                //声明
		Map hashMap = new HashMap();
		//向Map中添加数据
		//.....
		//转换
		ArrayList> arrayList = new ArrayList>(hashMap.entrySet());
		//排序
		Collections.sort(arrayList, new Comparator>(){
			public int compare(Map.Entry map1,
					Map.Entry map2) {
				return ((map2.getValue() - map1.getValue() == 0) ? 0
						: (map2.getValue() - map1.getValue() > 0) ? 1
								: -1);
			}
		});
		//输出
		for (Entry entry : arrayList) {
			System.out.println(entry.getKey() + "\t" + entry.getValue());
		}