java设计模式之：策略模式 例子

例子目录结构：


代码：
Duck.java

package com.dp.one.behavior.quack;

import com.dp.one.behavior.QuackBehavior;
public class Quack implements QuackBehavior {
	public void quack() {
		System.out.println("Quack!");
	}
}

ModelDuck.java

package com.dp.one.duck;

import com.dp.one.Duck;
import com.dp.one.behavior.fly.FlyNoWay;
import com.dp.one.behavior.quack.Quack;

public class ModelDuck extends Duck {

	public ModelDuck(){
		setFlyBehavior(new FlyNoWay());
		setQuackBehavior(new Quack());
	}
	@Override
	public void display() {
		System.out.println("I'm a real Model duck!");
	}
}

MallardDuck.java

package com.dp.one.duck;

import com.dp.one.Duck;
import com.dp.one.behavior.fly.FlyWithWings;
import com.dp.one.behavior.quack.Quack;

public class MallardDuck extends Duck {
	public MallardDuck(){
		setQuackBehavior(new Quack());
		setFlyBehavior(new FlyWithWings());
	}
	@Override
	public void display() {
		System.out.println("I'm a real Mallard duck!");
	}
}

FlyBehavior.java

package com.dp.one.behavior;

public interface FlyBehavior {
	void fly();
}

FlyNoWay.java

package com.dp.one.behavior.fly;

import com.dp.one.behavior.FlyBehavior;
public class FlyNoWay implements FlyBehavior {

	public void fly() {
		System.out.println("I can't fly!");
	}
}

FlyRocketPowered.java

package com.dp.one.behavior.fly;

import com.dp.one.behavior.FlyBehavior;
public class FlyRocketPowered implements FlyBehavior {

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

FlyWithWings.java

package com.dp.one.behavior.fly;

import com.dp.one.behavior.FlyBehavior;
public class FlyWithWings implements FlyBehavior {

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

QuackBehavior.java

package com.dp.one.behavior;

public interface QuackBehavior {
	void quack();
}

MuteQuack.java

package com.dp.one.behavior.quack;

import com.dp.one.behavior.QuackBehavior;
public class MuteQuack implements QuackBehavior {

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

Quack.java

package com.dp.one.behavior.quack;

import com.dp.one.behavior.QuackBehavior;
public class Quack implements QuackBehavior {
	public void quack() {
		System.out.println("Quack!");
	}
}

Squeak.java

package com.dp.one.behavior.quack;

import com.dp.one.behavior.QuackBehavior;
public class Squeak implements QuackBehavior {
	public void quack() {
		System.out.println("Squeak!");
	}
}

MiniDuckSimulator.java

package com.dp.one;

import com.dp.one.behavior.fly.FlyRocketPowered;
import com.dp.one.duck.MallardDuck;
import com.dp.one.duck.ModelDuck;

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

}