diff --git a/src/MathExamGenerator.class b/src/MathExamGenerator.class
index 7a7e19e..a2c4882 100644
Binary files a/src/MathExamGenerator.class and b/src/MathExamGenerator.class differ
diff --git a/src/MathExamGenerator.java b/src/MathExamGenerator.java
index 0eff0f6..956555a 100644
--- a/src/MathExamGenerator.java
+++ b/src/MathExamGenerator.java
@@ -62,6 +62,7 @@ public class MathExamGenerator {
         String input = reader.readLine();
 
         if (input == null || input.trim().isEmpty()) {
+            System.out.println("输入不能为空，请重新输入");
             return;
         } else if (input.equals("exit")) {
             isRunning = false;
@@ -191,7 +192,8 @@ public class MathExamGenerator {
                     isRunning = false;
                     break;
                 default:
-                    // 继续生成题目，不需要额外操作
+                    System.out.println("无效的选项，请重新输入");
+                    handleUserChoice();
                     break;
             }
         } catch (IOException e) {
diff --git a/src/SeniorQuestionGenerator.class b/src/SeniorQuestionGenerator.class
index 5204465..4b290f3 100644
Binary files a/src/SeniorQuestionGenerator.class and b/src/SeniorQuestionGenerator.class differ
diff --git a/src/UserInfo.class b/src/UserInfo.class
index 0820244..5cd42ea 100644
Binary files a/src/UserInfo.class and b/src/UserInfo.class differ