package adapter;

public abstract class Duck {
FlyBehavior flyBehavior;
QuackBehavior quackBehavior;
public Duck()
{
}

public void setFlyBehavior(FlyBehavior fb)
{
    flyBehavior=fb;
}
public void setQuackBehavior(QuackBehavior qb)
{
    quackBehavior=qb;
}
abstract void display();
public void performFly()
{
    flyBehavior.fly();
}
public void performQuack()
{
    quackBehavior.quack();
}
public void swim()
{
    System.out.println("all ducks float,even decoys!");
}
}

package adapter;

public interface QuackBehavior {
public void quack();
}

package adapter;

public interface FlyBehavior {
public void fly();
}

package adapter;

public class MallardDuck extends Duck{
    public MallardDuck()
    {
        quackBehavior=new Quack();
        flyBehavior=new FlyWithWings();
    }
    public void display()
    {
        System.out.println("i‘m a real Mallard duck");
    }

}

package adapter;

public class ModelDuck extends Duck{
public ModelDuck()
{
    flyBehavior=new FlyNoWay();
    quackBehavior=new Quack();
}
public void display()
{
    System.out.println("I‘m a model duck");
}
}

package adapter;

public class RubberDuck extends Duck {
    
    public RubberDuck() {
        flyBehavior = new FlyNoWay();
        quackBehavior = new Squeak();
    }
 
    public void display() {
        System.out.println("I‘m a rubber duckie");
    }
}

package adapter;

public class DecoyDuck extends Duck{
public DecoyDuck()
{
    setFlyBehavior(new FlyNoWay());
    setQuackBehavior(new MuteQuack());
}
public void display()
{
    System.out.println("i‘m a duck decoy");
    
}
}

 package adapter;

public class MuteQuack implements QuackBehavior {
    public void quack() {
        System.out.println("<< Silence >>");
    }
}

package adapter;

public class FakeQuack implements QuackBehavior{
public void quack()
{
    System.out.println("Qwak");
}

}

package adapter;

public class FlyNoWay implements FlyBehavior{
public void fly()
{
    System.out.println("i can‘t fly");
}
}

package adapter;

public class FlyWithWings implements FlyBehavior{
public void fly()
{
    System.out.println("i‘m flying");
}
}

 package adapter;

public class FlyRocketPowered implements FlyBehavior{
    public void fly()
    {
        System.out.println("i‘m flying with a rocket");
    }

}

package adapter;

public class MiniDuckSimulator {
public static void main(String[] args)
{
    MallardDuck mallard=new MallardDuck();
    RubberDuck rubberDuckie=new RubberDuck();
    DecoyDuck decoy=new DecoyDuck();
    
    ModelDuck model=new ModelDuck();
    
    mallard.performQuack();
    rubberDuckie.performQuack();
    decoy.performQuack();
    
    model.performFly();
    model.setFlyBehavior(new FlyRocketPowered());
    model.performFly();
}
}

package adapter;

public class MiniDuckSimulator1 {public static void main(String []args){    Duck mallard=new MallardDuck();    mallard.performQuack();
    mallard.performFly();
    
    Duck model=new ModelDuck();
    model.performFly();
    model.setFlyBehavior(new FlyRocketPowered());
    model.performFly();
}
}

面向对象-duck2