哈希Map合并工具类在Java是什么样的

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

public class CombineMapUtil {

	public static void main(String[] args) {
		Map<String,Object> map = new HashMap<String,Object>(); 
		map.put("test1", "1");
		map.put("test2", "2");
		map.put("test3", "3");
		
		Map<String,Object> plus = new HashMap<String,Object>();
		plus.put("test1", "2");
		plus.put("plus2", "2");
		plus.put("plus3", "3");
		
		Map<String,Map<String,Object>> testmap = new HashMap<>();
		
		List<Map> list = new ArrayList<Map>();
		
		list.add(map);
		list.add(plus);

		System.out.println(combineMap(list));
		
	}
	
	public static Map<String,List> combineMap(List<Map> list) {
		Map<String,List> map = new HashMap<>();
		for(Map m:list){
			Iterator<String> iter= m.keySet().iterator();
			while(iter.hasNext()){
				String key = iter.next();
				if(!map.containsKey(key)){
					List tmpList = new ArrayList<>();
					tmpList.add(m.get(key));
					map.put(key, tmpList);
				}else{
					map.get(key).add(m.get(key));  
				}
			}
		}
		return map;
	}
	
}

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