从数字区间中选取数据

public static void main(String[] args) {
		
		int v = 6;
		
		String peifu = "1:3,5:7,6:8,9:11";
		
		String[] sp = peifu.split(",");
		
		Map<String, String> map = new HashMap<String, String>();
		
		for (String s : sp) {
			String[] t = s.split(":");
			map.put(t[0],t[1]);
		}
		
		List<String> list = new ArrayList<String>();
		list.addAll(map.keySet());
		Collections.sort(list);

		int index = 0;
		for (String s : list) {
			if(v > Integer.valueOf(s).intValue()){
				index++;
			}
		}
		
		System.out.println(map.get(list.get(index)));
	}