java設計模式之---抽象工廠模式

概念

抽象工廠模式是所有形態的工廠模式中最爲抽象和最具一般性的. 抽象工廠模式可以向客戶端提供一個接口, 使得客戶端不必指定產品的具體類型的情況下, 能夠創建多個產品族的產品對象

產品族和產品等級結構圖

代碼

public interface Fruit {
	void get();
}

public abstract class Apple implements Fruit {
	@Override
	public abstract void get();
}

public abstract class Banana implements Fruit {
	@Override
	public abstract void get();

}

public class NorthApple extends Apple {
	@Override
	public void get() {
		System.out.println("北方蘋果");
	}
}

public class SouthApple extends Apple {
	@Override
	public void get() {
		System.out.println("南方蘋果");
	}
}

public class NorthBanana extends Banana {
	@Override
	public void get() {
		System.out.println("北方香蕉");
	}
}

public class SouthBanana extends Banana {
	@Override
	public void get() {
		System.out.println("南方香蕉");
	}
}

public interface FruitFactory {
	Fruit getApple();

	Fruit getBanana();
}

public class NorthFruitFactory implements FruitFactory {

	@Override
	public Fruit getApple() {
		return new NorthApple();
	}

	@Override
	public Fruit getBanana() {
		return new NorthBanana();
	}

}

public class SouthFruitFactory implements FruitFactory {
	@Override
	public Fruit getApple() {
		return new SouthApple();
	}

	@Override
	public Fruit getBanana() {
		return new SouthBanana();
	}
}

總結: 抽象工廠中方法對應產品結構, 具體工廠對應產品族(在本例中: 產品結構爲蘋果和香蕉, 產品族爲南方和北方)