设计模式之工厂方法模式(创建型)

public abstract class PayMethodFactory
{
    public abstract AbstractPay getPayMethod();
}

public class CashPayFactory extends PayMethodFactory
{
    public AbstractPay getPayMethod()
    {
        return new CashPay();
    }
} 

PayMethodFactory factory;
AbstractPay payMethod;
factory=new CashPayFactory();
payMethod =factory.getPayMethod();
payMethod.pay();