简单工厂模式
需求
看一个披萨项目：要便于披萨种类扩展，要便于维护
1、披萨种类有很多（比如：GreekPizza、CheesePizza等）
2、披萨的制作有prepare，bake，cut，box
3、完成披萨店订购功能
基本介绍
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：
pizza抽象类
/**
* @ProjectName: DesignPattern
* @Package: simplefactory
* @Author: huat
* @Date: 2020/6/16 16:57
* @Version: 1.0
*/
public abstract class Pizza {
//披萨名称
private String name;
//因为每个披萨原材料不同，所以此处使用抽象方法
//准备原材料
public abstract void perpare();
//烤披萨
public void bake(){
System.out.println("bake...."+name);
}
//切披萨
public void cut(){
System.out.println("cut...."+name);
}
//打包披萨
public void box(){
System.out.println("box...."+name);
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}pizza对象类
/**
* @ProjectName: DesignPattern
* @Package: simplefactory
* @Author: huat
* @Date: 2020/6/16 17:45
* @Version: 1.0
*/
public class GreekPizza extends Pizza {
@Override
public void perpare() {
System.out.println("给希腊披萨准备原材料");
}
}/**
* @ProjectName: DesignPattern
* @Package: simplefactory
* @Author: huat
* @Date: 2020/6/16 17:01
* @Version: 1.0
*/
public class CheesePizza extends Pizza {
@Override
public void perpare() {
System.out.println("给奶酪披萨准备原材料");
}
}pizza工厂类
import simplefactory.pizza.CheesePizza;
import simplefactory.pizza.GreekPizza;
import simplefactory.pizza.Pizza;
/**
* @ProjectName: DesignPattern
* @Package: simplefactory
* @Author: huat
* @Date: 2020/6/17 8:46
* @Version: 1.0
*/
//简单工厂类
public class SimpleFactory {
public Pizza createPizza(String type){
System.out.println("使用简单工厂模式");
Pizza pizza=null;
if("cheesePizza".equalsIgnoreCase(type)){
pizza=new CheesePizza();
pizza.setName("奶酪披萨");
}else if("greekPizza".equalsIgnoreCase(type)){
pizza=new GreekPizza();
pizza.setName("希腊披萨");
}
return pizza;
}
}订购披萨
import simplefactory.SimpleFactory;
import simplefactory.pizza.Pizza;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
/**
* @ProjectName: DesignPattern
* @Package: simplefactory.order
* @Author: huat
* @Date: 2020/6/16 17:55
* @Version: 1.0
*/
public class OrderPizza {
//初始化工厂类
SimpleFactory simpleFactory;
//披萨
Pizza pizza=null;
public void setSimpleFactory(SimpleFactory simpleFactory) throws IOException {
String pizzaType="";
this.simpleFactory = simpleFactory;
//循环订购披萨
do {
pizzaType=getType();
pizza=this.simpleFactory.createPizza(pizzaType);
if(null!=pizza){
pizza.perpare();
pizza.bake();
pizza.cut();
pizza.box();
}else{
System.out.println("暂无此pizza");
break;
}
}while (true);
}
//选择订购的披萨类型
private String getType() throws IOException {
BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(System.in));
System.out.println("请输入你要订购的披萨");
String str=bufferedReader.readLine();
return str;
}
}测试类
import simplefactory.SimpleFactory;
import simplefactory.order.OrderPizza;
import java.io.IOException;
/**
* @ProjectName: DesignPattern
* @Package: simplefactory.test
* @Author: huat
* @Date: 2020/6/17 14:46
* @Version: 1.0
*/
public class TestPizza {
public static void main(String[] args) throws IOException {
OrderPizza orderPizza=new OrderPizza();
orderPizza.setSimpleFactory(new SimpleFactory());
}
}本文参与 腾讯云自媒体分享计划，分享自作者个人站点/博客。
原始发表：2022-05-05，如有侵权请联系 cloudcommunity@tencent.com 删除
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