update:demo13

com/study/demo13/NotificationService.java

@@ -0,0 +1,66 @@
+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());
+    }
+}