1 工厂方法模式（Factory Method）

//接口

public interface Sender{
public void Send();
}

//实现类1

public classMailSender implements Sender{
public void Send(){
System.out.println("mail sender");
}
}

//实现类2

public class SMSSender implements Sender{
public void Send(){
System.out.println("SMS sender");
}
}

//静态工厂

public class SenderFactory{
public static Sender mailSender(){
return new MailSender();
}
public static Sender smsSender(){
return new SMSSender();
}
}

public class FactoryTest{
public static void main(String[] args){
SenderFactory.smsSender().Send();
SenderFactory.mailSender().Send();
}
}