工厂模式(运用在需要大量实例化对象的项目中):
定义一个创建对象的类,由这个类来封装实例化对象的行为
工厂方法模式:
定义一个创建对象的抽象方法,由子类来决定要实例化的类,工厂方法模式将对象的实例化推迟到了子类
抽象工厂模式:
定义了一个接口用于创建相关或有依赖关系的对象族,而无需明确指定具体类
依赖抽象原则:
变量不要持有具体类的引用
不要让类继承自具体类,要继承自抽象类或接口
不要覆盖基类中已实现的方法
首先抽象披萨类:
package com.wz.FiveFactory;
public abstract class Pizza {
protected String name;
public abstract void prepare();
public void bake()
{
System.out.println(name+" baking;");
}
public void cut()
{
System.out.println(name+" cutting;");
}
public void box()
{
System.out.println(name+" boxing;");
}
public void setname(String name)
{
this.name=name;
}
}
不同国家不同口味的披萨:
伦敦:
package com.wz.FiveFactory;
public class LDPepperPizza extends Pizza {
@Override
public void prepare() {
// TODO Auto-generated method stub
super.setname("LDPepperPizza");
System.out.println(name+" preparing;");
}
}
package com.wz.FiveFactory;
public class LDCheesePizza extends Pizza {
@Override
public void prepare() {
// TODO Auto-generated method stub
super.setname("LDCheesePizza");
System.out.println(name+" preparing;");
}
}
纽约:
package com.wz.FiveFactory;
public class NYCheesePizza extends Pizza {
@Override
public void prepare() {
// TODO Auto-generated method stub
super.setname("NYCheesePizza");
System.out.println(name+" preparing;");
}
}
package com.wz.FiveFactory;
public class NYPepperPizza extends Pizza {
@Override
public void prepare() {
// TODO Auto-generated method stub
super.setname("NYPepperPizza");
System.out.println(name+" preparing;");
}
}
将国家设计为接口(工厂):
package com.wz.FiveFactory;
public interface AbsFactory {
public Pizza CreatePizza(String ordertype) ;
}
伦敦:
package com.wz.FiveFactory;
public class LDFactory implements AbsFactory {
@Override
public Pizza CreatePizza(String ordertype) {
Pizza pizza = null;
if (ordertype.equals("cheese")) {
pizza = new LDCheesePizza();
} else if (ordertype.equals("pepper")) {
pizza = new LDPepperPizza();
}
return pizza;
}
}
纽约:
package com.wz.FiveFactory;
public class NYFactory implements AbsFactory {
@Override
public Pizza CreatePizza(String ordertype) {
Pizza pizza = null;
if (ordertype.equals("cheese")) {
pizza = new NYCheesePizza();
} else if (ordertype.equals("pepper")) {
pizza = new NYPepperPizza();
}
return pizza;
}
}
最后的测试:
package com.wz.FiveFactory;
public class PizzaStroe {
public static void main(String[] args) {
OrderPizza mOrderPizza;
// 不同的国家在这体现
mOrderPizza=new OrderPizza(new LDFactory());
}
}