Adapter Pattern
The Adapter Pattern converts the interface of a class into another interface the clients expect.
Adapter lets classes work together that couldnot otherwise beause of incompatible interfaces.
1 interface Duck {
2 public void quack();
3 public void fly();
4 }
5
6 interface Turkey {
7 public void gobble();
8 public void fly();
9 }
10
11 class MallardDuck implements Duck {
12 public void quack() {
13 System.out.println("Quack");
14 }
15 public void fly() {
16 System.out.println("fly");
17 }
18 }
19
20 class WildTurkey implements Turkey {
21 public void gobble() {
22 System.out.println("Gobble gobble");
23 }
24
25 public void fly() {
26 System.out.println("im flying a short distance");
27 }
28 }
29
30 class TurkeyAdapter implements Duck {
31 Turkey turkey;
32
33 public TurkeyAdapter(Turkey turkey) {
34 this.turkey = turkey;
35 }
36
37 public void quack() {
38 turkey.gobble();
39 }
40
41 public void fly() {
42 for(int i=0;i < 5;i++) {
43 turkey.fly();
44 }
45 }
46 }
47
48
49 public static void main(String[] args) {
50 MallardDuck duck = new MallardDuck();
51
52 WildTurkey turkey = new WildTurkey();
53 Duck turkeyAdapter = new TurkeyAdapter(turkey);
54
55 System.out.println("the turkey says ");
56 turkey.gobble();
57 turkey.fly();
58
59 System.out.println("the duck says ");
60 testDuck(duck);
61
62 System.out.println("the turkeyAdatper says ");
63 testDuck(turkeyAdapter);
64 }
65
66 static void testDuck(Duck duck) {
67 duck.quack();
68 duck.fly();
69 }
