设计模式之二工厂模式之二工厂方法模式
案例:
工厂方法模式介绍:
工厂方法模式设计方案:将披萨项目的实例化功能抽象成抽象方法,在不同的口味点餐子类中具体实现。
工厂方法模式:定义了一个创建对象的抽象方法,由子类决定要实例化的类。工厂方法模式将对象的实例化推迟到子类。
类图:
代码实现:
package com.hy.factory.factorymethod.pizzastore.pizza; /** * @author hanyong * @date 2020/10/31 20:35 */ //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; } } package com.hy.factory.factorymethod.pizzastore.pizza; /** * @author hanyong * @date 2020/11/4 23:48 */ public class LDPepperPizza extends Pizza { @Override public void prepare() { setName("伦敦胡椒披萨"); System.out.println("准备伦敦胡椒披萨原材料"); } } package com.hy.factory.factorymethod.pizzastore.pizza; /** * @author hanyong * @date 2020/11/4 23:47 */ public class LDCheesePizza extends Pizza { @Override public void prepare() { setName("伦敦奶酪披萨"); System.out.println("准备伦敦奶酪披萨原材料"); } } package com.hy.factory.factorymethod.pizzastore.pizza; /** * @author hanyong * @date 2020/11/4 23:46 */ public class BJPepperPizza extends Pizza { @Override public void prepare() { setName("北京胡椒披萨"); System.out.println("准备北京胡椒披萨原材料"); } } package com.hy.factory.factorymethod.pizzastore.pizza; /** * @author hanyong * @date 2020/11/4 23:44 */ public class BJCheesePizza extends Pizza { @Override public void prepare() { setName("北京奶酪披"); System.out.println("准备北京奶酪披萨的原材料"); } } package com.hy.factory.factorymethod.pizzastore.order; import com.hy.factory.factorymethod.pizzastore.pizza.Pizza; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; /** * @author hanyong * @date 2020/11/4 23:52 */ public abstract class OrderPizza { abstract Pizza createPizza(String orderType); public OrderPizza() { Pizza pizza=null; String orderType ; do { orderType = getType(); pizza = 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.hy.factory.factorymethod.pizzastore.order; import com.hy.factory.factorymethod.pizzastore.pizza.LDCheesePizza; import com.hy.factory.factorymethod.pizzastore.pizza.LDPepperPizza; import com.hy.factory.factorymethod.pizzastore.pizza.Pizza; /** * @author hanyong * @date 2020/11/5 0:01 */ public class LDOrderPizza extends OrderPizza { @Override Pizza createPizza(String orderType) { Pizza pizza = null; if(orderType.equals("cheese")) { pizza = new LDCheesePizza(); } else if (orderType.equals("pepper")) { pizza = new LDPepperPizza(); } return pizza; } } package com.hy.factory.factorymethod.pizzastore.order; import com.hy.factory.factorymethod.pizzastore.pizza.BJCheesePizza; import com.hy.factory.factorymethod.pizzastore.pizza.BJPepperPizza; import com.hy.factory.factorymethod.pizzastore.pizza.Pizza; /** * @author hanyong * @date 2020/11/4 23:58 */ public class BJOrderPizza extends OrderPizza { @Override Pizza createPizza(String orderType) { Pizza pizza = null; if(orderType.equals("cheese")) { pizza = new BJCheesePizza(); } else if (orderType.equals("pepper")) { pizza = new BJPepperPizza(); } return pizza; } } package com.hy.factory.factorymethod.pizzastore.order; /** * @author hanyong * @date 2020/11/5 0:04 */ public class PizzaStore { public static void main(String[] args) { String city="bj"; if(city.equals("bj")){ new BJOrderPizza(); }else{ new LDOrderPizza(); } } }