消息推送系统

public interface MessageService {

void sendMessage(String message, String recipient);

String receiveMessage();

}

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public class EmailService implements MessageService {

@Override

public void sendMessage(String message, String recipient) {

// 发送邮件的逻辑

}

@Override

public String receiveMessage() {

// 接收邮件的逻辑

return "message";

}

}

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public class MessageManager {

private List services;

public MessageManager(List services) {

this.services = services;

}

public void sendMessage(String message, String recipient) {

for (MessageService service : services) {

大专排课软件源码

service.sendMessage(message, recipient);

}

}

public String receiveMessage() {

for (MessageService service : services) {

String message = service.receiveMessage();

if (message != null) {

return message;

}

}

return null;

}

}

]]>