合并List<Map<String,String>>中的重复数据并对某个字段做累加

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package demo;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;public class mergeData {    public static void main(String[] args) {        List<Map<String, String>> l = new ArrayList<Map<String, String>>();        Map<String, String> oneMap = new HashMap<String, String>();        oneMap.put("gsId", "8000");        oneMap.put("gsName", "总部集中处理中心");        oneMap.put("type", "D");        oneMap.put("yybcount", "3");        l.add(oneMap);        Map<String, String> twoMap = new HashMap<String, String>();        twoMap.put("gsId", "8008");        twoMap.put("gsName", "南京长江路证券营业部");        twoMap.put("type", "H");        twoMap.put("yybcount", "14");        l.add(twoMap);        List<Map<String, String>> twoList = new ArrayList<Map<String, String>>();        Map<String, String> oneMap1 = new HashMap<String, String>();        oneMap1.put("gsId", "8008");        oneMap1.put("gsName", "南京长江路证券营业部");        oneMap1.put("type", "H");        oneMap1.put("yybcount", "5");        twoList.add(oneMap1);        Map<String, String> twoMap2 = new HashMap<String, String>();        twoMap2.put("gsId", "8008");        twoMap2.put("gsName", "南京止马营证券营业部");        twoMap2.put("type", "F");        twoMap2.put("yybcount", "9");        twoList.add(twoMap2);        l.addAll(twoList);        List<Map<String, String>> countList = new ArrayList<Map<String, String>>();// 用于存放最后的结果        for (int i = 0; i < l.size(); i++) {            String gsId = l.get(i).get("gsId");            String type = l.get(i).get("type");            int flag = 0;// 0为新增数据，1为增加count            for (int j = 0; j < countList.size(); j++) {                String gsId_ = countList.get(j).get("gsId");                String type_ = countList.get(j).get("type");                if (gsId.equals(gsId_) && type.equals(type_)) {                    int sum = Integer.parseInt(l.get(i).get("yybcount"))                            + Integer.parseInt(countList.get(j).get("yybcount"));                    countList.get(j).put("yybcount", sum + "");                    flag = 1;                    continue;                }            }            if (flag == 0) {                countList.add(l.get(i));            }        }        for (Map<String, String> map : countList) {            System.out.println(map);        }    }}

返回结果：
{gsName=总部集中处理中心, yybcount=3, type=D, gsId=8000}
{gsName=南京长江路证券营业部, yybcount=19, type=H, gsId=8008}
{gsName=南京止马营证券营业部, yybcount=9, type=F, gsId=8008}

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