基於1，1.1，1.1.1，1.2，1.2.1，2，2.1的排序

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;

/**
 * <h1>.</h1><BR/>
 * 
 * @author cyj - 2014-10-26
 */
public class MapComparator implements Comparator<Map<String, Object>> {
	/**
	 * 排序用到的key
	 */
	private String key;

	public MapComparator(String key) {
		this.key = key;
	}

	@Override
	public int compare(Map<String, Object> o1, Map<String, Object> o2) {
		// 獲取比較的字串
		String compareValue1 = (String) o1.get(key);
		String compareValue2 = (String) o2.get(key);
		String[] valueSplit1 = compareValue1.split("[.]");
		String[] valueSplit2 = compareValue2.split("[.]");
		int minLength = valueSplit1.length;
		if (minLength > valueSplit2.length) {
			minLength = valueSplit2.length;
		}
		for (int i = 0; i < minLength; i++) {
			int value1 = Integer.parseInt(valueSplit1[i]);
			int value2 = Integer.parseInt(valueSplit2[i]);
			if(value1 > value2){
				return 1;
			}else if(value1 < value2){
				return -1;
			}
		}
		return valueSplit1.length - valueSplit2.length;
	}

	public static void main(String[] args) {
		List<Map<String,Object>> list = new ArrayList<Map<String,Object>>();
		Random random = new Random();
		for(int i = 0;i<10;i++){
			Map<String,Object> map = new HashMap<String, Object>();
			int lenght = random.nextInt(5) + 2;
			String compareKey = null;
			for(int j = 0 ;j<lenght;j++){
				if(compareKey == null){
					compareKey = "" + random.nextInt(3);
				}else{
					compareKey += "." + random.nextInt(3);
				}
			}
			map.put("compareKey", compareKey);
			list.add(map);
		}
		System.out.println("排序之前");
		printMap(list);
		Collections.sort(list, new MapComparator("compareKey"));
		System.out.println("\n排序之後");
		printMap(list);
	}
	public  static void printMap(List<Map<String,Object>> list){
		for(int i=0;i<list.size();i++){
			System.out.println(list.get(i).get("compareKey") );
		}
	}

}
 

程式執行結果：

排序之前
2.1.0
1.0.0.1.1
1.0.2
0.1.1
0.0.2
1.2.0
1.1.1.2.0.2
2.2.2.2.2.1
1.2
2.1.2


排序之後
0.0.2
0.1.1
1.0.0.1.1
1.0.2
1.1.1.2.0.2
1.2
1.2.0
2.1.0
2.1.2
2.2.2.2.2.1