1 public class Composite {
 2 
 3     public static void main(String[] args) {
 4 
 5         Map<Integer, String> hashMap = new HashMap<>();
 6         hashMap.put(0, "东游记");
 7 
 8         Map<Integer, String> map = new HashMap<>();
 9         map.put(1, "西游记");
10         map.put(2, "红楼梦");
11         hashMap.putAll(map);
12 
13         System.out.println(hashMap);
14 
15     }
16 }