src/Main.java

@@ -1,6 +1,6 @@
 import controller.AppController;
 
-public class Main {
+public class       Main {
     public static void main(String[] args) {
         new AppController(); // 启动控制器
     }

src/view/QuizPanel.java

@@ -49,6 +49,8 @@ public class QuizPanel extends JPanel {
             showResult();
             return;
         }
+        //解决进入下一题后会默认选择前一题的选项问题
+        group.clearSelection();
         Question q = questions.get(currentIndex);
         questionLabel.setText("第 " + (currentIndex + 1) + " 题：" + q.questionText);
         for (int i = 0; i < 4; i++) {