两个map合并

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<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"));
        
    }
}

输出结果为：Helloworld