123

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;