創建型設計模式_工廠模式

一、建接口類 

//工廠模式解決的問題：對象如何向外提供？
public interface Fruit {
	public void show();
}

二、建實現類

public class Apple implements Fruit {

	@Override
	public void show() {
		System.out.println("我是蘋果");
	}

}

public class Banana implements Fruit {

	@Override
	public void show() {
		System.out.println("我是香蕉");
	}

}

public class Orangle implements Fruit {

	@Override
	public void show() {
		System.out.println("我是橘子");
	}

}

三、建工廠類

public class FruitFactory {

	public static final int FRUIT_TYPE_ORANGLE = 1;
	public static final int FRUIT_TYPE_BANANA = 2;
	public static final int FRUIT_TYPE_APPLE = 3;

	public static Fruit getFruit(int fruit_type) {
		switch (fruit_type) {
		case FRUIT_TYPE_ORANGLE:
			return new Orangle();
		case FRUIT_TYPE_BANANA:
			return new Banana();
		case FRUIT_TYPE_APPLE:
			return new Apple();
		}
		throw new RuntimeException("找不到水果類型");
	}
}

四、建測試類

public class Test {

	public static void main(String[] args) {
		Fruit fruit=FruitFactory.getFruit(FruitFactory.FRUIT_TYPE_ORANGLE);
		Fruit fruit1=FruitFactory.getFruit(FruitFactory.FRUIT_TYPE_BANANA);
		Fruit fruit2=FruitFactory.getFruit(FruitFactory.FRUIT_TYPE_APPLE);
		fruit.show();
		fruit1.show();
		fruit2.show();
	}

}

五、運行結果