工厂模式

//一个接口

public interface Sender{

public void send();

}

//实现类-1

public class MailSender implements Sender{

@override

public void send(){

System.out.println(“This is mail”);

}

} 

//实现类-2

public class SmsSender implements Sender{

@override

public void send(){

System.out.println(“This is Sms");

}

}

//工厂类

public class SendFactory{

public Sender produceMail(){

return new MailSender();

}

public Send produceSms(){

return new SmsSender();

}

}

//测试类

public class Test{

public static void main(String[] args){

SendFactory sf = new SendFactory();

Sender sender = sf.produceSms();

sender.send();//This is Sms

}

}