Second commit

src/User.java

@@ -117,22 +117,22 @@ public class User {
     // 预设用户数据
     public static Map<String, User> getPresetUsers() {
         Map<String, User> users = new HashMap<>();
-        
+
         // 小学用户
-        users.put("1", new User("1", "123", "小学"));
+        users.put("张三1", new User("张三1", "123", "小学"));
         users.put("张三2", new User("张三2", "123", "小学"));
         users.put("张三3", new User("张三3", "123", "小学"));
-        
+
         // 初中用户
         users.put("李四1", new User("李四1", "123", "初中"));
-        users.put("2", new User("2", "123", "初中"));
+        users.put("李四2", new User("李四2", "123", "初中"));
         users.put("李四3", new User("李四3", "123", "初中"));
-        
+
         // 高中用户
         users.put("王五1", new User("王五1", "123", "高中"));
         users.put("王五2", new User("王五2", "123", "高中"));
-        users.put("3", new User("3", "123", "高中"));
-        
+        users.put("王五3", new User("王五3", "123", "高中"));
+
         return users;
     }
 }