利用Java程序将字符串进行排序与拼接

1、初始生成字符串的代码程序：

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);

	}

2、main方法调用拼接的方法

public static void main(String[] args) {

		// TODO Auto-generated method stub

		sortList(maps);

		getTimeString();

		getTotalString();



	}

3、将程序进行排序

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;

	}



}

4、拼接字符串

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;

	}



}