两个map合并所用函数为：putAll

package myProject;import java.util.HashMap;import java.util.Map;public class TestMapMerge {    public static void main(String[] args) {        Map
     
       map1=new HashMap
      
       ();        Map
       
         map2=new HashMap
        
         ();                map1.put("a", "Hello");        map2.put("b", "world");                map1.putAll(map2);        System.out.println(map1.get("a")+(String)map2.get("b"));            }}
        
       
      
     

输出结果为：Helloworld