设计模式：适配器

public class DuckTestDrive {
public static void main(String[] args) {
//首先，获得一个野鸭。
MallardDuck duck = new MallardDuck();
//然后获得一直火鸡
WildTurkey turkey = new WildTurkey();
//新建一个火鸡和鸭子的适配器
Duck turkeyAdapter = new TurkeyAdapter(turkey);

System.out.println("The Turkey says...");
turkey.gobble();
turkey.fly();

System.out.println("\nThe Duck says...");
testDuck(duck);

System.out.println("\nThe TurkeyAdapter says...");
//由此火鸡说的话鸭子就听得懂了，然后鸭子的话目前火鸡还不懂，需要重新写个鸭子的适配器。
testDuck(turkeyAdapter);
}

static void testDuck(Duck duck) {
duck.quack();
duck.fly();
}
}

public interface Duck {
public void quack();
public void fly();
}

public class DuckAdapter implements Turkey {
Duck duck;
Random rand;

public DuckAdapter(Duck duck) {
this.duck = duck;
rand = new Random();
}
//适配器做的事情就是兼容两种不同的叫声，当火鸡咕咕叫的时候适配器把它转化成呱呱叫。
public void gobble() {
duck.quack();
}

public void fly() {
if (rand.nextInt(5)  == 0) {
duck.fly();
}
}
}

public class MallardDuck implements Duck {
public void quack() {
System.out.println("Quack");
}

public void fly() {
System.out.println("I'm flying");
}
}

public interface Turkey {
public void gobble();
public void fly();
}

public class TurkeyAdapter implements Duck {
Turkey turkey;

public TurkeyAdapter(Turkey turkey) {
this.turkey = turkey;
}

public void quack() {
turkey.gobble();
}

public void fly() {
for(int i=0; i < 5; i++) {
turkey.fly();
}
}
}

public class WildTurkey implements Turkey {
public void gobble() {
System.out.println("Gobble gobble");
}

public void fly() {
System.out.println("I'm flying a short distance");
}
}