package com.map.test;import java.util.ArrayList;import java.util.Collections;import java.util.HashMap;import java.util.List;import java.util.Map;public class Test {	/**	 * @param args	 */	public static List<Map<String, String>> maps = new ArrayList<Map<String,String>>();	static{				Map m1 = new HashMap<String, String>();		m1.put("total", "10");		m1.put("createTime", "2014-10-18");		maps.add(m1);		Map m2 = new HashMap<String, String>();		m2.put("total", "20");		m2.put("createTime", "2014-10-15");		maps.add(m2);		Map m3 = new HashMap<String, String>();		m3.put("total", "30");		m3.put("createTime", "2014-10-19");		maps.add(m3);		Map m4 = new HashMap<String, String>();		m4.put("total", "40");		m4.put("createTime", "2014-10-17");		maps.add(m4);		Map m5 = new HashMap<String, String>();		m5.put("total", "50");		m5.put("createTime", "2014-10-16");		maps.add(m5);		Map m6 = new HashMap<String, String>();		m6.put("total", "60");		m6.put("createTime", "2014-10-20");		maps.add(m6);		Map m7 = new HashMap<String, String>();		m7.put("total", "70");		m7.put("createTime", "2014-10-21");		maps.add(m7);	}

public static void main(String[] args) {		// TODO Auto-generated method stub		sortList(maps);		getTimeString();		getTotalString();	}

package com.map.test;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Comparator;import java.util.Date;import java.util.Map;public class ReportCompare implements Comparator<Map<String, String>> {	@Override	public int compare(Map<String, String> o1, Map<String, String> o2) {		String o1Time = o1.get("createTime");		String o2Time = o2.get("createTime");		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");		try {			Date o1D = sdf.parse(o1Time);			Date o2D = sdf.parse(o2Time);			if (o1D.before(o2D)) {				return -1;			}else if (o1D.equals(o2D)) {				return 0;			}else if (o1D.after(o2D)) {				return 1;			}		} catch (ParseException e) {			// TODO Auto-generated catch block			e.printStackTrace();		}		return 2;	}}

public static void getTimeString() {		StringBuffer sb = new StringBuffer("[");		for (Map<String, String> map : maps) {			sb.append("‘"+map.get("createTime")+"‘,");		}		sb.deleteCharAt(sb.length()-1);		sb.append("]");		System.out.println(sb.toString());	}	public static void getTotalString() {		StringBuffer sb = new StringBuffer("[");		for (Map<String, String> map : maps) {			sb.append(map.get("total")+",");		}		sb.deleteCharAt(sb.length()-1);		sb.append("]");		System.out.println(sb.toString());	}	public static List<Map<String, String>> sortList(List<Map<String, String>> maps){		 Collections.sort(maps, new ReportCompare());		 return maps;	}}