my_project1/src/frontend/QuestionCountFrame.java

package frontend;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import backend.User;

public class QuestionCountFrame extends JFrame {
  private JTextField countField;
  private JButton startButton, backButton;
  private User currentUser;
  private MainFrame mainFrame;

  public QuestionCountFrame(MainFrame mainFrame, User user) {
    this.mainFrame = mainFrame;
    this.currentUser = user;
    initializeUI();
  }

  private void initializeUI() {
    setTitle("题目数量设置 - " + currentUser.getUserType());
    setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    setSize(400, 250);
    setLocationRelativeTo(mainFrame);
    setResizable(false);

    // 创建主面板
    JPanel mainPanel = new JPanel(new BorderLayout(10, 10));
    mainPanel.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));

    // 标题
    JLabel titleLabel = new JLabel("请输入题目数量", JLabel.CENTER);
    titleLabel.setFont(new Font("微软雅黑", Font.BOLD, 16));
    titleLabel.setForeground(new Color(0, 120, 215));

    // 信息标签
    JLabel infoLabel = new JLabel("当前选择: " + currentUser.getUserType(), JLabel.CENTER);
    infoLabel.setFont(new Font("微软雅黑", Font.PLAIN, 14));

    // 输入面板
    JPanel inputPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
    JLabel countLabel = new JLabel("题目数量:");
    countLabel.setFont(new Font("微软雅黑", Font.PLAIN, 14));
    countField = new JTextField(10);
    countField.setFont(new Font("微软雅黑", Font.PLAIN, 14));

    inputPanel.add(countLabel);
    inputPanel.add(countField);

    // 按钮面板
    JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.CENTER, 20, 10));
    startButton = new JButton("开始答题");
    backButton = new JButton("返回");

    setupButtonStyle(startButton);
    setupButtonStyle(backButton);

    buttonPanel.add(startButton);
    buttonPanel.add(backButton);

    // 添加组件到主面板
    mainPanel.add(titleLabel, BorderLayout.NORTH);
    mainPanel.add(infoLabel, BorderLayout.CENTER);
    mainPanel.add(inputPanel, BorderLayout.CENTER);
    mainPanel.add(buttonPanel, BorderLayout.SOUTH);

    add(mainPanel);

    // 添加事件监听器
    setupEventListeners();
  }

  private void setupButtonStyle(JButton button) {
    button.setFont(new Font("微软雅黑", Font.BOLD, 14));
    button.setBackground(new Color(0, 120, 215));
    button.setForeground(Color.BLACK);
    button.setFocusPainted(false);
    button.setBorder(BorderFactory.createEmptyBorder(10, 20, 10, 20));
  }

  private void setupEventListeners() {
    startButton.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        handleStartQuiz();
      }
    });

    backButton.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        dispose();
      }
    });

    // 回车键开始答题
    countField.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        handleStartQuiz();
      }
    });
  }

  private void handleStartQuiz() {
    String countText = countField.getText().trim();

    if (countText.isEmpty()) {
      JOptionPane.showMessageDialog(this, "请输入题目数量", "输入错误", JOptionPane.WARNING_MESSAGE);
      return;
    }

    try {
      int count = Integer.parseInt(countText);
      if (count <= 0) {
        JOptionPane.showMessageDialog(this, "题目数量必须大于0", "输入错误", JOptionPane.WARNING_MESSAGE);
        return;
      }

      if (count > 50) {
        JOptionPane.showMessageDialog(this, "题目数量不能超过50", "输入错误", JOptionPane.WARNING_MESSAGE);
        return;
      }

      // 创建答题界面
      dispose();
      new QuizFrame(mainFrame, currentUser, count).setVisible(true);

    } catch (NumberFormatException e) {
      JOptionPane.showMessageDialog(this, "请输入有效的数字", "输入错误", JOptionPane.WARNING_MESSAGE);
    }
  }
}