Java/com/study/demo13/NotificationService.java

package com.study.demo13;

interface Notifier {
    void send(String message, int level);
    String getChannel();
}

class EmailNotifier implements Notifier {
    private String channel = "EMAIL";

    @Override
    public void send(String message, int level) {
        System.out.println("[EMAIL] " + (level >= 3 ? "[紧急] " : "") + message);
    }

    @Override
    public String getChannel() {
        return channel;
    }
}

class SMSNotifier implements Notifier {
    private String channel = "SMS";

    @Override
    public void send(String message, int level) {
        System.out.println("[SMS] " + (level >= 3 ? "[紧急] " : "") + message);
    }

    @Override
    public String getChannel() {
        return channel;
    }
}

class PushNotifier implements Notifier {
    private String channel = "PUSH";

    @Override
    public void send(String message, int level) {
        System.out.println("[PUSH] " + (level >= 3 ? "[紧急] " : "") + message);
    }

    @Override
    public String getChannel() {
        return channel;
    }
}

public class NotificationService {
    public static void main(String[] args) {
        Notifier email = new EmailNotifier();
        Notifier sms = new SMSNotifier();
        Notifier push = new PushNotifier();

        email.send("您的订单已发货", 1);
        sms.send("验证码: 123456", 2);
        push.send("账户安全警告", 3);
        email.send("重要通知：系统维护", 4);

        System.out.println("\n通知渠道类型：");
        System.out.println("Email渠道: " + email.getChannel());
        System.out.println("SMS渠道: " + sms.getChannel());
        System.out.println("Push渠道: " + push.getChannel());
    }
}