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);
}
}