工厂模式-使用同一接口创建不同的类实例

/*
 * 模式名称：工厂模式
 * 模式特征：通过一个通用的接口创建不同的类对象
 * 模式用途：面向接口编程，动态联编，多态性
 * */
package Creator.Factory;

public class FactoryTest {

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  Factoryable factory;
  factory=new Factory().getFactoryable(Factory.FACTORYA_ID);
  factory.showName();
  factory=new Factory().getFactoryable(Factory.FACTORYB_ID);
  factory.showName();
 }
}

interface Factoryable{
 public void showName();
}

class FactoryA implements Factoryable{
 public void showName(){
  System.out.println("FactoryA.showName()");
 }
}
class FactoryB implements Factoryable{
 public void showName(){
  System.out.println("FactoryB.showName()");
 }
}

class Factory{
 public static final int FACTORYA_ID=1,
       FACTORYB_ID=2;
 public static Factoryable getFactoryable(int factoryID){
  switch(factoryID){
  case 1:
   return new FactoryA();
  case 2:
   return new FactoryB();
  default:
   return null;
  }
 }
}