编辑代码

import java.util.Map;
import java.util.HashMap;
import java.util.Set;
import java.util.Collection;
public class Demo16 {
    public static void main(String[] args ){
        Map<String, String> map1 = new HashMap<>();
        map1.put("name","--哥");
        map1.put("age","30");
        map1.put("sex","男");

       Map<String, String>map2 = new HashMap<>();
       map2.put("height", "180");
       map2.put("salary","5w");
       map2.putAll(map1);
       System.out.println("map2="+map2);
    }
}