java设计模式之工厂方法详解

public abstract class Product {   public Product()  {  }}public class ConcreteProduct1 extends Product {   public ConcreteProduct1()  {  }}public class ConcreteProduct2 extends Product {   public ConcreteProduct2()  {  }}public abstract class Creator {   public Creator()  {  }   public abstract Product factoryMethod();}public class ConcreteCreator1 extends Creator {   public ConcreteCreator1()  {  }   public Product factoryMethod()  { return new ConcreteProduct1(); }}public class ConcreteCreator2 extends Creator {   public ConcreteCreator2()  {  }   public Product factoryMethod()  {  return new ConcreteProduct2(); }}