Java設計模式（三）：工廠模式（簡單工廠模式、工廠方法模式、抽象工廠模式）

簡單工廠模式

package com.iter.devbox.factory.simplefactory;

public interface Car {
	public void run();
}

package com.iter.devbox.factory.simplefactory;

public class Audi implements Car {
	public void run() {
		System.out.println("奧迪在跑");
	}
}

package com.iter.devbox.factory.simplefactory;

public class Byd implements Car {
	public void run() {
		System.out.println("比亞迪在跑");
	}
}

package com.iter.devbox.factory.simplefactory;

public class CarFactory {
	
	// 簡單工廠的第一種實現方式
	public static Car createCar(String type) {
		if ("奧迪".equals(type)) {
			return new Audi();
		} else if ("比亞迪".equals(type)) {
			return new Byd();
		} else {
			return null;
		}
	}
	// 簡單工廠的第二種實現方式
	public static Car createAudi() {
		return new Audi();
	}
	
	public static Car createByd() {
		return new Byd();
	}
}

package com.iter.devbox.factory.simplefactory;

public class Client {
	public static void main(String[] args) {
		Car audi = CarFactory.createCar("奧迪");
		audi.run();
		Car byd = CarFactory.createByd();
		byd.run();
	}
}

工廠方法模式

package com.iter.devbox.factory.factorymethod;

public interface Car {
	public void run();
}

package com.iter.devbox.factory.factorymethod;

public class Audi implements Car {
	public void run() {
		System.out.println("奧迪在跑");
	}
}

package com.iter.devbox.factory.factorymethod;

public class Byd implements Car {
	public void run() {
		System.out.println("比亞迪在跑");
	}
}

package com.iter.devbox.factory.factorymethod;

public class Benz implements Car {
	public void run() {
		System.out.println("奔馳在跑");
	}
}

package com.iter.devbox.factory.factorymethod;

public interface CarFactory {
	public Car createCar();
}


package com.iter.devbox.factory.factorymethod;

public class AudiFactory implements CarFactory {
	public Car createCar() {
		return new Audi();
	}
}

package com.iter.devbox.factory.factorymethod;

public class BydFactory implements CarFactory {
	public Car createCar() {
		return new Byd();
	}
}

package com.iter.devbox.factory.factorymethod;

public class BenzFactory implements CarFactory {
	public Car createCar() {
		return new Benz();
	}
}

package com.iter.devbox.factory.factorymethod;

public class Client {
	public static void main(String[] args) {
		Car audi = new AudiFactory().createCar();
		audi.run();
		Car byd = new BydFactory().createCar();
		byd.run();
		Car benz = new BenzFactory().createCar(); // 新增加的產品
		benz.run();
	}
}

抽象工廠模式

package com.iter.devbox.factory.abstractfactory;

public interface Engine {
	void run();
	void start();
}
class LuxuryEngine implements Engine {
	public void run() {
		System.out.println("Engine 轉得快");
	}
	public void start() {
		System.out.println("Engine 啓動快！可以自動啓停！");
	}
}
class LowEngine implements Engine {
	public void run() {
		System.out.println("Engine 轉得慢");
	}
	public void start() {
		System.out.println("Engine 啓動慢！不能自動啓停！");
	}
}

package com.iter.devbox.factory.abstractfactory;

public interface Seat {
	void massage();
}
class LuxurySeat implements Seat {
	public void massage() {
		System.out.println("Seat 可以自動按摩！");
	}
}
class LowSeat implements Seat {
	public void massage() {
		System.out.println("Seat 不能按摩！");
	}
}

package com.iter.devbox.factory.abstractfactory;

public interface Tyre {
	void revolve();
}
class LuxuryTyre implements Tyre {
	public void revolve() {
		System.out.println("Tyre 旋轉不磨損");
	}
}
class LowTyre implements Tyre {
	public void revolve() {
		System.out.println("Tyre 旋轉磨損快");
	}
}

package com.iter.devbox.factory.abstractfactory;

public interface CarFactory {
	Engine createEngine();
	Seat createSeat();
	Tyre createTyre();
}

package com.iter.devbox.factory.abstractfactory;

public class LuxuryCarFactory implements CarFactory {
	public Engine createEngine() {
		return new LuxuryEngine();
	}
	public Seat createSeat() {
		return new LuxurySeat();
	}
	public Tyre createTyre() {
		return new LuxuryTyre();
	}
}

package com.iter.devbox.factory.abstractfactory;

public class LowCarFactory implements CarFactory {
	public Engine createEngine() {
		return new LowEngine();
	}
	public Seat createSeat() {
		return new LowSeat();
	}
	public Tyre createTyre() {
		return new LowTyre();
	}
}

package com.iter.devbox.factory.abstractfactory;

public class Client {
	public static void main(String[] args) {
		CarFactory factory = new LuxuryCarFactory();
		Engine engine = factory.createEngine();
		engine.run();
		engine.start();
		Seat seat = factory.createSeat();
		seat.massage();
		Tyre tyre = factory.createTyre();
		tyre.revolve();
	}
}