java设计模式_抽象工厂模式

一、什么是抽象工厂模式

抽象工厂模式是所有形态的工厂模式中最为抽 象和最其一般性的。抽象工厂模式可以向客户端 提供一个接口，使得客户端在不必指定产品的具
体类型的情况下，能够创建多个产品族的产品对 象。

二、产品族和产品等级结构

三、模式中包含的角色及其职责

1.抽象工厂（Creator）角色抽象工厂模式的核心，包含对多个产品结构的声明，任何工厂类都必须实现这个接口。

2.具体工厂（ Concrete Creator）角色具体工厂类是抽象工厂的一个实现，负责实例化某个产品族中的产品对象。

3.抽象（Product）角色抽象模式所创建的所有对象的父类，它负责描述所有实例所共有的公共接口。

4.具体产品（Concrete Product）角色抽象模式所创建的具体实例对象 总结：抽象工厂中方法对应产品结构，具体工厂对应产品族。

//示例1:public interface Fruit {    /**     * 采集     */    public void get();}public abstract class Apple implements Fruit {    /*     * 采集     */    public abstract void get();}public class NorthApple extends Apple {    /*     * 采集     */    @Override    public void get() {        System.out.println("采集北方的平果");    }}public class SouthApple extends Apple {    /*     * 采集     */    @Override    public void get() {        System.out.println("采集南方的平果");    }}public abstract class Banana implements Fruit {    /*     * 采集     */    public abstract void get();}public class NorthBanana implements Fruit {    /*     * 采集     */    public void get(){        System.out.println("采集北方的香焦");    }}public class SouthBanana implements Fruit {    /*     * 采集     */    public void get(){        System.out.println("采集南方的香焦");    }}public interface FruitFactory {    //实例化Apple    public Fruit getApple();    //实例化Banana    public Fruit getBanana();}public class NorthFruitFactory implements FruitFactory {    @Override    public Fruit getApple() {        return new NorthApple();    }    @Override    public Fruit getBanana() {        return new NorthBanana();    }}public class SouthFruitFactory implements FruitFactory {    @Override    public Fruit getApple() {        return new SouthApple();    }    @Override    public Fruit getBanana() {        return new SouthBanana();    }}public class MainClass {    public static void main(String[] args) throws Exception {        FruitFactory northFruitFactory = new NorthFruitFactory();        Fruit northApple = northFruitFactory.getApple();        northApple.get();        Fruit northBanana = northFruitFactory.getBanana();        northBanana.get();        FruitFactory southFruitFactory = new SouthFruitFactory();        Fruit southApple = southFruitFactory.getApple();        southApple.get();        Fruit southBanana = southFruitFactory.getBanana();        southBanana.get();    }}//采集北方的苹果//采集北方的香焦//采集南方的苹果//采集南方的香焦//*现在考虑增加一个温室类型水果public class WenshiApple extends Apple {    @Override    public void get() {        System.out.println("采集温室苹果");    }}public class WenshiBanana extends Banana {    @Override    public void get() {        System.out.println("采集温室香焦");    }}public class WenshiFruitFactory implements FruitFactory {    @Override    public Fruit getApple() {        return new WenshiApple();    }    @Override    public Fruit getBanana() {        return new WenshiBanana();    }}public class MainClass {    public static void main(String[] args) throws Exception {        FruitFactory northFruitFactory = new NorthFruitFactory();        Fruit northApple = northFruitFactory.getApple();        northApple.get();        Fruit northBanana = northFruitFactory.getBanana();        northBanana.get();        FruitFactory southFruitFactory = new SouthFruitFactory();        Fruit southApple = southFruitFactory.getApple();        southApple.get();        Fruit southBanana = southFruitFactory.getBanana();        southBanana.get();        FruitFactory wenshiFruitFactory = new WenshiFruitFactory();        Fruit wenshiFruit = wenshiFruitFactory.getApple();        wenshiFruit.get();        Fruit wenshiBanana = wenshiFruitFactory.getBanana();        wenshiBanana.get();    }}//采集北方的苹果//采集北方的香焦//采集南方的苹果//采集南方的香焦//采集温室苹果//采集温室香焦