关于两个ListMap组合的有关问题，大家帮忙看看

//原始数据源List<Map<String, Object>> data = new ArrayList<Map<String, Object>>();//要添加的数据源 这个新的数据源是从数据库中查询出来的。暂定执行5次也就是要向data 中添加5次List<Map<String, Object>> newData = new ArrayList<Map<String, Object>>();//最终的组合是这样的一个效果 List<Map<String, Object>> data     key ="博士",value="12";   key ="研究生",value="13";   key ="本科",value="3";newData ==》添加到data 中 如果key相同的话那就value相加，如果在data 中不存在相应的key 则新put一个数据到里面比如newData    key ="博士",value="3";   key ="研究生",value="3";   key ="本科",value="3";   key ="专科",value="13";那前三项的key都能在data中找到则value相加，key="专科"在data中找不到则添加这个map到data list 中去。

List<Map<String, Object>> data = new ArrayList<Map<String, Object>>();List<Map<String, Object>> newData = new ArrayList<Map<String, Object>>();for(Map newMap : newData) {    Iterator<String> it = newMap.keySet().iterator();    while(it.hasNext()) {        String key = it.next();        boolean find = false;        for(Map map : data) {           if(map.containsKey(key)) {               find = true;               map.put(key,                    String.valueOf(                      Integer.parse(map.get(key)) + Integer.parse(newMap.get(key))));               break;           }        }        if(!find) {           map.put(key, String.valueOf(Integer.parse(newMap.get(key))));        }    }}
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Java code
package test;import java.util.HashMap;import java.util.Iterator;import java.util.Map;public class MapTest {    public static void main(String []args){        Map<String,Integer> data = new HashMap<String,Integer>();        data.put("博士", 12);        data.put("研究生", 13);        data.put("本科", 3);                Map<String,Integer> newData = new HashMap<String,Integer>();        newData.put("博士", 3);        newData.put("研究生", 3);        newData.put("本科", 3);        newData.put("专科", 13);                Iterator<String> it = newData.keySet().iterator();        while(it.hasNext()){            String s = it.next();            Integer val = data.get(s);            if(val==null){                data.put(s, newData.get(s));            }else{                data.put(s, val+newData.get(s));            }        }        Iterator<String> t = data.keySet().iterator();        while(t.hasNext()){            String temp = t.next();            System.out.println(temp+":"+data.get(temp));        }    }}
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for example
Java code
import java.util.*;public class Test {    public static void main(String []args){        List<Map<String, Object>> data = new ArrayList<Map<String, Object>>();        List<Map<String, Object>> newData = new ArrayList<Map<String, Object>>();        //sample original data        Map<String, Object> map = new HashMap<String, Object>();        map.put("博士", "12");        data.add(map);        map = new HashMap<String, Object>();        map.put("研究生", "13");        data.add(map);        map = new HashMap<String, Object>();        map.put("本科", 3);        data.add(map);        //sample new data        map = new HashMap<String, Object>();        map.put("博士", "3");        newData.add(map);        map = new HashMap<String, Object>();        map.put("研究生", "3");        newData.add(map);        map = new HashMap<String, Object>();        map.put("本科", "3");        newData.add(map);        map = new HashMap<String, Object>();        map.put("专科", "13");        newData.add(map);        //merge        List<Map<String, Object>> addData = new ArrayList<Map<String, Object>>();        for (Map<String, Object> m1 : newData) {            for (Map.Entry<String, Object> e1 : m1.entrySet()) {                boolean exist = false;                for (Map<String, Object> m2 : data) {                    if (m2.containsKey(e1.getKey())) {                        exist = true;                        m2.put(e1.getKey(),                             Integer.valueOf((String)m2.get(e1.getKey())) +                             Integer.valueOf((String)e.getValue()));                        break;                    }                }                if (! exist) {                    map = new Map<String, Object>();                    map.put(e1.getKey(), e1.getValue());                    addData.add(map);                }            }        }        data.addAll(addData);    }}