传统的方式的优缺点
1) 优点是比较好理解,简单易操作。
2) 缺点是违反了设计模式的ocp原则,即对扩展开放,对修改关闭。即当我们给类增加新功能的时候,尽量不修改代码,或者尽可能少修改代码
//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;
}
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 ");
}
}
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 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);
}