//几个Button类 
class Button{/* ...*/} 
class WinButton extends Button{/* ...*/} 
class MacButton extends Button{/* ...*/} 
  
//它们的工厂类 
interface ButtonFactory{ 
  abstract Button createButton(); 
} 
class WinButtonFactory implements ButtonFactory{ 
  Button createButton(){ 
    return new WinButton(); 
  } 
} 
class MacButtonFactory implements ButtonFactory{ 
  Button createButton(){ 
    return new MacButton(); 
  } 
} 

abstract class AbstractProductA{ 
  public abstract void operationA1(); 
  public abstract void operationA2(); 
} 
 
class ProductA1 extends AbstractProductA{ 
  ProductA1(String arg){ 
    System.out.println("Hello "+arg); 
  } // Implement the code here 
  public void operationA1() { }; 
  public void operationA2() { }; 
} 
 
class ProductA2 extends AbstractProductA{ 
  ProductA2(String arg){ 
    System.out.println("Hello "+arg); 
  } // Implement the code here 
  public void operationA1() { }; 
  public void operationA2() { }; 
} 
 
abstract class AbstractProductB{ 
  //public abstract void operationB1(); 
  //public abstract void operationB2(); 
} 
 
class ProductB1 extends AbstractProductB{ 
  ProductB1(String arg){ 
    System.out.println("Hello "+arg); 
  } // Implement the code here 
} 
 
class ProductB2 extends AbstractProductB{ 
  ProductB2(String arg){ 
    System.out.println("Hello "+arg); 
  } // Implement the code here 
} 
 
abstract class AbstractFactory{ 
  abstract AbstractProductA createProductA(); 
  abstract AbstractProductB createProductB(); 
} 
 
class ConcreteFactory1 extends AbstractFactory{ 
  AbstractProductA createProductA(){ 
    return new ProductA1("ProductA1"); 
  } 
  AbstractProductB createProductB(){ 
    return new ProductB1("ProductB1"); 
  } 
} 
 
class ConcreteFactory2 extends AbstractFactory{ 
  AbstractProductA createProductA(){ 
    return new ProductA2("ProductA2"); 
  } 
  AbstractProductB createProductB(){ 
    return new ProductB2("ProductB2"); 
  } 
} 
 
//Factory creator - an indirect way of instantiating the factories 
class FactoryMaker{ 
  private static AbstractFactory pf=null; 
  static AbstractFactory getFactory(String choice){ 
    if(choice.equals("a")){ 
      pf=new ConcreteFactory1(); 
    }else if(choice.equals("b")){ 
            pf=new ConcreteFactory2(); 
        } 
        return pf; 
  } 
} 
 
// Client 
public class Client{ 
  public static void main(String args[]){ 
    AbstractFactory pf=FactoryMaker.getFactory("a"); 
    AbstractProductA product=pf.createProductA(); 
    //more function calls on product 
  } 
}