基本介绍:
定义抽象类:
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;
}
}
定义 Pizza 继承类:
public class CheesePizza extends Pizza{
@Override
public void prepare() {
setName("奶酪pizza");
System.out.println(name + " preparing;");
}
}
public class GreekPizza extends Pizza {
@Override
public void prepare() {
setName("GreekPizza");
System.out.println(name + " preparing;");
}
}
public class PepperPizza extends Pizza {
@Override
public void prepare() {
setName("PepperPizza");
System.out.println(name + " preparing;");
}
}
定义 工厂类:
public class SimplePizzaFactory {
public Pizza createPizza(String type){
System.out.println(" 使用简单工厂模式");
Pizza pizza = null;
if (type.equals("cheese")) {
pizza = new CheesePizza();
}else if(type.equals("greek")){
pizza = new GreekPizza();
} else if (type.equals("pepper")) {
pizza = new PepperPizza();
}
return pizza;
}
}
使用:
public class OrderPizza {
SimplePizzaFactory simpleFactory;
Pizza pizza;
String orderType;
public OrderPizza(SimplePizzaFactory simpleFactory, String orderType) {
this.orderType = orderType;
this.setFactory(simpleFactory);
}
public void setFactory(SimplePizzaFactory simpleFactory) {
this.simpleFactory = simpleFactory;
pizza = simpleFactory.createPizza(orderType);
pizza.prepare();
pizza.bake();
pizza.cut();
pizza.box();
}
public static void main(String[] args) {
SimplePizzaFactory simpleFactory = new SimplePizzaFactory();
OrderPizza orderPizza = new OrderPizza(simpleFactory, "greek");
}
}
基本介绍:
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
定义抽象方法,让各个工厂子类自己实现:
public abstract class OrderPizza {
Pizza pizza;
public OrderPizza(String orderType) {
pizza = createPizza(orderType);//抽象方法,由工厂子类完成
//输出 pizza 制作过程
pizza.prepare();
pizza.bake();
pizza.cut();
pizza.box();
}
public OrderPizza() {
}
//定义一个抽象方法,createPizza,让各个工厂子类自己实现
abstract Pizza createPizza(String orderlype);
public static void main(String[] args) {
OrderPizza pizza = new BJOrderPizza("cheese");
}
}
子类实现一:
public class BJCheesePizza extends Pizza {
@Override
public void prepare() {
setName("BJ奶酪pizza");
System.out.println(name + " preparing;");
}
}
public class BJPepperPizza extends Pizza {
@Override
public void prepare() {
setName("BJPepperPizza");
System.out.println(name + " preparing;");
}
}
public class BJOrderPizza extends OrderPizza{
public BJOrderPizza(String orderType) {
super(orderType);
}
@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;
}
}
子类实现二:
public class SHCheesePizza extends Pizza {
@Override
public void prepare() {
setName("SH奶酪pizza");
System.out.println(name + " preparing;");
}
}
public class SHPepperPizza extends Pizza {
@Override
public void prepare() {
setName("SHPepperPizza");
System.out.println(name + " preparing;");
}
}
public class SHOrderPizza extends OrderPizza{
public SHOrderPizza(String orderType) {
super(orderType);
}
@Override
Pizza createPizza(String orderType) {
Pizza pizza = null;
if(orderType.equals("cheese")) {
pizza = new SHCheesePizza();
} else if(orderType.equals("pepper")) {
pizza = new SHPepperPizza();
}
return pizza;
}
}
基本介绍:
抽象工厂的抽象层:
/**
* 声明AbsFactory接口
*/
public interface AbsFactory {
//让不同的工厂类来实现createPizza方法
public Pizza createPizza(String type);
}
具体实现一:
public class BJCheesePizza extends Pizza {
@Override
public void prepare() {
setName("BJ奶酪pizza");
System.out.println(name + " preparing;");
}
}
public class BJPepperPizza extends Pizza {
@Override
public void prepare() {
setName("BJPepperPizza");
System.out.println(name + " preparing;");
}
}
public class BJFactory implements AbsFactory {
@Override
public Pizza createPizza(String orderType) {
Pizza pizza = null;
if(orderType.equals("cheese")) {
pizza = new BJCheesePizza();
} else if(orderType.equals("pepper")) {
pizza = new BJPepperPizza();
}
return pizza;
}
}
具体实现二:
public class SHCheesePizza extends Pizza {
@Override
public void prepare() {
setName("SH奶酪pizza");
System.out.println(name + " preparing;");
}
}
public class SHPepperPizza extends Pizza {
@Override
public void prepare() {
setName("SHPepperPizza");
System.out.println(name + " preparing;");
}
}
public class SHFactory implements AbsFactory {
@Override
public Pizza createPizza(String orderType) {
Pizza pizza = null;
if(orderType.equals("cheese")) {
pizza = new SHCheesePizza();
} else if(orderType.equals("pepper")) {
pizza = new SHPepperPizza();
}
return pizza;
}
}
执行类:
public class OrderPizza {
AbsFactory factory;
String orderType;
// 构造器
public OrderPizza(AbsFactory factory, String orderType) {
this.orderType = orderType;
setFactory(factory);
}
public void setFactory(AbsFactory factory){
Pizza pizza = null;
this.factory = factory;
pizza = factory.createPizza(orderType);
//输出 pizza 制作过程
pizza.prepare();
pizza.bake();
pizza.cut();
pizza.box();
}
public static void main(String[] args) {
BJFactory factory = new BJFactory();
OrderPizza orderPizza = new OrderPizza(factory, "greek");
}
}