删除IN_GENERATE_COUNT,MAX_GENERATE_COUNT，直接使用10，30

src/Application.java

@@ -20,8 +20,6 @@ public class Application {
 
   // 用于解析“切换为XX”命令的正则表达式
   private static final Pattern SWITCH_COMMAND_PATTERN = Pattern.compile("^切换为(小学|初中|高中)$");
-  private static final int MIN_GENERATE_COUNT = 10;
-  private static final int MAX_GENERATE_COUNT = 30;
 
   public Application() {
     this.scanner = new Scanner(System.in, "UTF-8");
@@ -71,7 +69,7 @@ public class Application {
     Optional<User> userOptional = authService.login(credentials[0], credentials[1]);
     if (userOptional.isPresent()) {
       sessionManager.startSession(userOptional.get());
-      System.out.println("登录成功！欢迎您，" + userOptional.get().getUsername() + "。");
+      System.out.println("登录成功！欢迎您，" + credentials[0] + "。");
     } else {
       System.out.println("用户名或密码错误，请重试。");
     }
@@ -83,22 +81,21 @@ public class Application {
   private void handleLoggedInState() throws IOException {
     String currentLevelName = sessionManager.getCurrentLevelName();
     System.out.printf(
-            "当前选择为%s出题。请输入生成题目数量（%d-%d），或输入 '切换为XX'，或输入 '-1' 退出登录：%n",
-            currentLevelName, MIN_GENERATE_COUNT, MAX_GENERATE_COUNT);
+            "当前选择为%s出题。请输入生成题目数量（10-30），或输入 '切换为XX'，或输入 '-1' 退出登录：%n",
+            currentLevelName);
     String input = scanner.nextLine().trim();
 
-
       if ("-1".equals(input)) {
         handleLogout();
       } else if (isSwitchCommand(input)) {
         handleSwitchLevel(input);
       } else if (isNumeric(input)) {
         int count = Integer.parseInt(input);
-        validateGenerateCount(count);
-        handleGenerateProblems(count);
+        if(validateGenerateCount(count)) {
+          handleGenerateProblems(count);
+        }
       } else {
-
-
+        System.out.println("无效的选项，请重新输入");
       }
 
   }
@@ -150,10 +147,12 @@ public class Application {
     return str != null && str.matches("-?\\d+");
   }
 
-  private void validateGenerateCount(int count) {
-    if (count < MIN_GENERATE_COUNT || count > MAX_GENERATE_COUNT) {
+  private boolean validateGenerateCount(int count) {
+    if (count < 10 || count > 30) {
       System.out.println("生成数量必须在10到30之间。");
+      return false;
     }
+    return true;
   }
 
   public static void main(String[] args) throws IOException {