適配器模式是將一個類型接口進行封裝從而轉化另一個類型的接口,它的作用相當於一個類型轉換器。
1、模式中的角色
Adaptee接口:這是需要被轉換的源類型,即需要進行轉換的接口。
Adapter類:對Adaptee進行轉換的類
Target接口:目標接口,最終轉化成的接口類型
2、角色關係圖
3、實例
描述:將火雞對象轉換成鴨子對象
a.Adaptee角色
Turkey接口:
public interface Turkey {
public void gobble();
public void fly();
}
WildTurkey類:
public class WildTurkey implements Turkey {
@Override
public void gobble() {
// TODO Auto-generated method stub
System.out.print("gobble");
}
@Override
public void fly() {
// TODO Auto-generated method stub
System.out.print("turkey is flying");
}
}
b.Target角色
Duck接口:
public interface Duck {
public void quack();
public void fly();
}
MallardDuck類:
public class MallardDuck implements Duck {
@Override
public void quack() {
// TODO Auto-generated method stub
System.out.print("quack");
}
@Override
public void fly() {
// TODO Auto-generated method stub
System.out.print("duck is flying");
}
}
c.Adapter
TurkeyAdapter適配器:
public class TurkeyAdapter implements Duck {
Turkey turkey;
public TurkeyAdatper(Turkey turkey) {
this.turkey=turkey;
}
@Override
public void quack() {
// TODO Auto-generated method stub
turkey.gobble();
}
@Override
public void fly() {
// TODO Auto-generated method stub
turkey.fly();
}
}
測試:
public static void main(String[] args) {
// TODO Auto-generated method stub
MallardDuck duck=new MallardDuck();
WildTurkey turkey=new WildTurkey();
Duck turkeyAdapter=new TurkeyAdatper(turkey);
}
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