工厂模式（一）

简单工厂模式

实现方式：

√使用Java接口或者Java抽象类；

√使用过个工厂方法；

√产品循环使用；

√多态的丧失和模式的退化，主要体现在工厂方法创建的对象、工厂方法返回的类型、工厂等级结构三个方面。

（1）Fruit.java（实现水果产品接口）

public interface Fruit{void plant();void grow();void harvest();}

（2）Apple.java（实现具体产品——苹果）

public class Apple implements Fruit{private int treeAge;public void plant(){System.out.println("Apple has been planted.");}public void grow(){System.out.println("Apple is growing...");}public void harvest(){System.out.println("Apple has been harvest.");}public int getTreeAge(){return treeAge;}public void setTreeAge(int treeAge){this.treeAge = treeAge;}}

（3）Grape.java（实现具体产品——葡萄）

public class Grape implements Fruit{private boolean seedless;public void plant(){System.out.println("Grape has been planted.");}public void grow(){System.out.println("Grape is growing...");}public void harvest(){System.out.println("Grape has been harvest.");}public boolean getSeedless(){return seedless;}public void setSeedless(int seedless){this.seedless = seedless;}public static void log(String msg){System.out.println(msg);}}

（4）Strawberry.java（实现具体产品——草莓）

public class Strawberry implements Fruit{private boolean seedless;public void plant(){System.out.println("Strawberry has been planted.");}public void grow(){System.out.println("Strawberry is growing...");}public void harvest(){System.out.println("Strawberry has been harvest.");}public static void log(String msg){System.out.println(msg);}}

（5）FruitGardener.java（实现水果工厂接口）

public interface FruitGardener{public Fruit factory();}

（6）AppleGardener.java（实现苹果工厂）

public class AppleGardener implements FruitGardener{public Fruit factory(){Fruit f = new Apple();System.out.println("水果工厂（AppleGardener）成功创建一个水果：苹果！");return f;}}

（7）GrapeGardener.java（实现葡萄工厂）

public class GrapeGardener implements FruitGardener{public Fruit factory(){Fruit f = new Grape();System.out.println("水果工厂（GrapeGardener）成功创建一个水果：葡萄！");return f;}}

（8）StrawberryGardener.java（实现草莓工厂）

public class StrawberryGardener implements FruitGardener{public Fruit factory(){Fruit f = new Strawberry();System.out.println("水果工厂（StrawberryGardener）成功创建一个水果：草莓！");return f;}}

（9）TestApp.java（客户端测试类）

public class TestApp{private FruitGardener f1, f2, f3;private Fruit p1, p2, p3;private void test(){//实例化水果工厂f1 = new AppleGardener();f2 = new GrapeGardener();f3 = new StrawberryGardener();//从水果工厂生产水果p1 = f1.factory();p2 = f2.factory();p3 = f3.factory();}public static void main(String[] args){TestApp testapp = new TestApp();testapp.test();}}