简单工厂模式

• 简介

1) 简单工厂模式是属于创建型模式，是工厂模式的一种。简单工厂模式是由一个工厂对象决定创建出哪一种产品类的实例。简单工厂模式是工厂模式家族中最简单实用的模式
2) 简单工厂模式：定义了一个创建对象的类，由这个类来封装实例化对象的行为(代码)
3) 在软件开发中，当我们会用到大量的创建某种、某类或者某批对象时，就会使用到工厂模式

• 代码实现

package com.atguigu.factory.simplefactory.pizzastore.pizza;
//将Pizza 类做成抽象
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.println(name + " baking;");
	}
 
	public void cut() {
		System.out.println(name + " cutting;");
	}
 
	//打包
	public void box() {
		System.out.println(name + " boxing;");
	}
 
	public void setName(String name) {
		this.name = name;
	}
}
 
public class PepperPizza extends Pizza {
	@Override
	public void prepare() {
		// TODO Auto-generated method stub
		System.out.println(" 给胡椒披萨准备原材料 ");
	}
}
 
public class GreekPizza extends Pizza {
	@Override
	public void prepare() {
		// TODO Auto-generated method stub
		System.out.println(" 给希腊披萨 准备原材料 ");
	}
}
 
public class CheesePizza extends Pizza {
	@Override
	public void prepare() {
		// TODO Auto-generated method stub
		System.out.println(" 给制作奶酪披萨 准备原材料 ");
	}
}
 
package com.atguigu.factory.simplefactory.pizzastore.order;
import com.atguigu.factory.simplefactory.pizzastore.pizza.CheesePizza;
import com.atguigu.factory.simplefactory.pizzastore.pizza.GreekPizza;
import com.atguigu.factory.simplefactory.pizzastore.pizza.PepperPizza;
import com.atguigu.factory.simplefactory.pizzastore.pizza.Pizza;
//简单工厂类
public class SimpleFactory {
 
	//更加orderType 返回对应的Pizza 对象
	public Pizza createPizza(String orderType) {
 
		Pizza pizza = null;
 
		System.out.println("使用简单工厂模式");
		if (orderType.equals("greek")) {
			pizza = new GreekPizza();
			pizza.setName(" 希腊披萨 ");
		} else if (orderType.equals("cheese")) {
			pizza = new CheesePizza();
			pizza.setName(" 奶酪披萨 ");
		} else if (orderType.equals("pepper")) {
			pizza = new PepperPizza();
			pizza.setName("胡椒披萨");
		}
		return pizza;
	}
}
 
package com.atguigu.factory.simplefactory.pizzastore.order;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import com.atguigu.factory.simplefactory.pizzastore.pizza.Pizza;
public class OrderPizza {
 
	//定义一个简单工厂对象
	SimpleFactory simpleFactory;
	Pizza pizza = null;
	
	//构造器
	public OrderPizza(SimpleFactory simpleFactory) {
		setFactory(simpleFactory);
	}
	
	public void setFactory(SimpleFactory simpleFactory) {
		String orderType = ""; //用户输入的
		
		this.simpleFactory = simpleFactory; //设置简单工厂对象
		
		do {
			orderType = getType(); 
			pizza = this.simpleFactory.createPizza(orderType);
			
			//输出pizza
			if(pizza != null) { //订购成功
				pizza.prepare();
				pizza.bake();
				pizza.cut();
				pizza.box();
			} else {
				System.out.println(" 订购披萨失败 ");
				break;
			}
		}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(new InputStreamReader(System.in));
			System.out.println("input pizza 种类:");
			String str = strin.readLine();
			return str;
		} catch (IOException e) {
			e.printStackTrace();
			return "";
		}
	}
 
}
 
package com.atguigu.factory.simplefactory.pizzastore.order;
 
//相当于一个客户端，发出订购
public class PizzaStore {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//使用简单工厂模式
		new OrderPizza(new SimpleFactory());
		System.out.println("~~退出程序~~");
	}
}

• 静态工厂模式

public class SimpleFactory {
	
	//简单工厂模式 也叫 静态工厂模式 
	public static Pizza createPizza2(String orderType) {
 
		Pizza pizza = null;
 
		System.out.println("使用简单工厂模式2");
		if (orderType.equals("greek")) {
			pizza = new GreekPizza();
			pizza.setName(" 希腊披萨 ");
		} else if (orderType.equals("cheese")) {
			pizza = new CheesePizza();
			pizza.setName(" 奶酪披萨 ");
		} else if (orderType.equals("pepper")) {
			pizza = new PepperPizza();
			pizza.setName("胡椒披萨");
		}
		return pizza;
	}
 
}
 
package com.atguigu.factory.simplefactory.pizzastore.order;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import com.atguigu.factory.simplefactory.pizzastore.pizza.Pizza;
public class OrderPizza2 {
 
	Pizza pizza = null;
	String orderType = "";
	// 构造器
	public OrderPizza2() {
		
		do {
			orderType = getType();
			pizza = SimpleFactory.createPizza2(orderType);
 
			// 输出pizza
			if (pizza != null) { // 订购成功
				pizza.prepare();
				pizza.bake();
				pizza.cut();
				pizza.box();
			} else {
				System.out.println(" 订购披萨失败 ");
				break;
			}
		} 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(new InputStreamReader(System.in));
			System.out.println("input pizza 种类:");
			String str = strin.readLine();
			return str;
		} catch (IOException e) {
			e.printStackTrace();
			return "";
		}
	}
}
 
package com.atguigu.factory.simplefactory.pizzastore.order;
//相当于一个客户端，发出订购
public class PizzaStore {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		new OrderPizza2();
	}
}