不說了，直接上程式碼:

 1 public class NewTest {
 2 
 3     public static void main(String[] args) {
 4         N<Integer> n1 = new N<Integer>(1) {
 5             @Override
 6             void handler() {
 7                 System.out.println("這個是數字:" + this.getContent());
 8 
 9
 
             }
10 
11         };
12         n1.handler();
13 
14         var n2 = new N<String>("這個是字串，用var定義臨時變數哦") {
15             @Override
16             void handler() {
17                 System.out.println("這個是字串文字哦:" + this.getContent());
18 
19             }
20         };
21
 
         n2.handler();
22 
23         /*我可以匿名哦,JDK9支援哦*/
24         N<?> n3 = new N<>("object") {
25             @Override
26             void handler() {
27                 System.out.println("object:"+this.getContent());
28             }
29         };
30         n3.handler();
31
 
     }
32 
33 }
34 
35 
36 abstract class N<T> {
37 
38     private T content;
39 
40     public N(T content) {
41         this.content = content;
42     }
43 
44     public T getContent() {
45         return content;
46     }
47 
48     public void setContent(T content) {
49         this.content = content;
50     }
51 
52     abstract void handler();
53 
54 }