package myProject;

import java.util.HashMap;

import java.util.Map;

public class TestMapMerge {

    public static void main(String[] args) {

        Map<String,Object> map1=new HashMap<String,Object>();

        Map<String,Object> map2=new HashMap<String,Object>();

        map1.put("a", "Hello");

        map2.put("b", "world");

        map1.putAll(map2);

        System.out.println(map1.get("a")+(String)map2.get("b"));

    }

}