设计模式-简单工厂设计模式

需求

看一个具体的需求
看一个披萨的项目:要便于披萨种类的扩展，要便于维护1)
1)披萨的种类很多(比如GreekPizz、CheesePizz等)
2)披萨的制作有prepare，bake, cut,box
3)完成披萨店订购功能。

详解图

披萨类

public abstract class Pizza {
	protected String name; //名字
	//准备原材料，不同的披萨不一样因此,我们做成抽象方法
	public abstract void prepare();
	public void bake() {
		System.out.print1n(name + " baking; ");
	}
	public void cut() {
		System.out.println(name + " cutting; ");
	}
	//打包
	public void box() {
		System.out.print1n(name + " boxing; ");
	}
	public void setName(String name) {
		this.name = name;
	}
}

各类披萨

public class CheesePizza extends Pizza {
	@Override
	public void prepare() {
		System.out.println("给制作奶酪披萨准备原材料");
	}
}

public class GreekPizza extends Pizza {
	@override
	public void prepare() {
		System.out.println("给希腊披萨准备原材料");
	}
}

订购披萨

public OrderPizza(){
	Pizza pizza = null;
	String orderType; //订购披萨的类型
	do {
		orderType = getType();
		if (orderType.equals( "greek")) {
			pizza = new GreekPizza();pizza.setName("希腊披萨");
		}else if (orderType.equals("cheese")){
			pizza = new CheesePizza();
			pizza.setName("奶酷披萨");
		}else {
			break;
		}
		//输出pizza制作过程			
		pizza.prepare();
		pizza.bake();
		pizza.cut();
		pizza.box();
	}while (true);
}
//写一个方法,可以获取客户希望订购的披萨种类
	private String getType() {
		try {
			BufferedReader strin = new BufferedReader(newInputStreamReader(System.in));
			System.out.printLn( "input pizza种类E");
			String str = strin.readLine();
			return str;
		}catch (IOException e) {
			e.printStackTrace();
		}
		return strin;
	}
}

客户端订购披萨

//相当于一个客户端,发出订购
public class PizzaStore {
	public static void main(String[] args) {
		new OrderPizza();
	}
}

结果