one last commit

src/MainFrame.java

@@ -180,6 +180,12 @@ public class MainFrame extends JFrame {
         changePasswordButton.addActionListener(e -> showPasswordChangePanel());
         bottomPanel.add(changePasswordButton);
 
+        // 新增：删除账号按钮
+        JButton deleteAccountButton = createStyledButton("删除账号");
+        deleteAccountButton.setBackground(new Color(220, 20, 60)); // 红色背景提示危险操作
+        deleteAccountButton.addActionListener(e -> deleteAccount());
+        bottomPanel.add(deleteAccountButton);
+
         JButton logoutButton = createStyledButton("退出登录");
         logoutButton.addActionListener(e -> logout());
         bottomPanel.add(logoutButton);
@@ -188,6 +194,43 @@ public class MainFrame extends JFrame {
 
         mainPanel.add(panel, "GradeSelection");
     }
+    // 新增：删除当前账号功能
+    private void deleteAccount() {
+        // 简单确认对话框
+        int result = JOptionPane.showConfirmDialog(
+                this,
+                "确定要删除当前账号吗？\n用户名：" + currentUserId + "\n此操作不可恢复！",
+                "确认删除账号",
+                JOptionPane.YES_NO_OPTION,
+                JOptionPane.WARNING_MESSAGE
+        );
+
+        if (result == JOptionPane.YES_OPTION) {
+            // 直接使用当前用户名作为邮箱（根据您的系统设计，用户名可能就是邮箱）
+            // 或者让用户输入邮箱确认
+            String userEmail = JOptionPane.showInputDialog(
+                    this,
+                    "请输入您的邮箱进行确认：",
+                    "确认删除",
+                    JOptionPane.QUESTION_MESSAGE
+            );
+
+            if (userEmail != null && !userEmail.trim().isEmpty()) {
+                // 调用User_service的Unregister函数删除账号
+                String deleteResult = userService.Unregister(userEmail.trim());
+
+                if (deleteResult.equals("删除成功")) {
+                    JOptionPane.showMessageDialog(this, "账号删除成功！");
+                    // 清除当前用户信息并返回登录界面
+                    currentUserId = null;
+                    examService = null;
+                    showLoginPanel();
+                } else {
+                    JOptionPane.showMessageDialog(this, "删除失败：" + deleteResult);
+                }
+            }
+        }
+    }
 
     private void createExamPanel() {
         JPanel panel = new JPanel(new BorderLayout(10, 10));