具体的子任务: a) 定义一个名为 Question 的类来保存单个问题,即文本、可能的答案和正确答案索引; (0.25P) b) 编写一个方法,通过 JFileChooser 选择文件,并将该文件中的所有问题读取到 Question 对象的数组/列表中(假设该文件具有上述结构); (0.25点) c) 使用上述组件设计和实现 GUI:菜单、显示问题和答案的能力、选择答案、显示结果和分数以及继续下一个问题的能力。 (适当的布局:1P,类扩展JFrame:0.25P, 类遵循OOP原则:0.25P,主方法全局设置:0.25P) d) 编写一个方法以在您设计的 GUI 上显示问题; (0.25点) e) 实现一个 actionPerforming 方法来响应用户与 GUI 的交互。确保根据需要启用和禁用交互式组件,例如,用户不应在没有先选择答案的情况下跳到下一个问题,并且他们不应能够在完成当前测验之前加载新测验; (类实现 ActionListener:0.25P,启用/禁用组件:0.25P, 按要求工作:1P) 可选挑战:随机化问题和答案的显示顺序。问题:你怎么知道哪个答案是正确的?选择答案后,如果用户选择了正确答案,请以绿色突出显示。如果他们选择了错误的答案,请以红色突出显示他们的答案,以绿色突出显示正确的答案。单击“下一步”时,重置颜色。 添加一个拨号框,确认用户在按菜单中的“退出”时是否确实要退出程序。
时间: 2024-02-06 10:11:59 浏览: 145
好的,这是一个关于数据库课程设计的具体任务,以下是一些指导:
a) 定义一个名为 Question 的类来保存单个问题,即文本、可能的答案和正确答案索引。可以使用 Java 中的类来定义问题,例如:
```
public class Question {
private String text;
private String[] answers;
private int correctAnswerIndex;
// Constructor
public Question(String text, String[] answers, int correctAnswerIndex) {
this.text = text;
this.answers = answers;
this.correctAnswerIndex = correctAnswerIndex;
}
// Getters
public String getText() {
return text;
}
public String[] getAnswers() {
return answers;
}
public int getCorrectAnswerIndex() {
return correctAnswerIndex;
}
}
```
b) 编写一个方法,通过 JFileChooser 选择文件,并将该文件中的所有问题读取到 Question 对象的数组/列表中。可以使用 Java I/O 来读取文件,例如:
```
public static List<Question> loadQuestionsFromFile() {
List<Question> questions = new ArrayList<>();
JFileChooser chooser = new JFileChooser();
int result = chooser.showOpenDialog(null);
if (result == JFileChooser.APPROVE_OPTION) {
File file = chooser.getSelectedFile();
try (BufferedReader br = new BufferedReader(new FileReader(file))) {
String line;
while ((line = br.readLine()) != null) {
String[] parts = line.split(",");
String text = parts[0];
String[] answers = Arrays.copyOfRange(parts, 1, parts.length - 1);
int correctAnswerIndex = Integer.parseInt(parts[parts.length - 1]);
questions.add(new Question(text, answers, correctAnswerIndex));
}
} catch (IOException e) {
e.printStackTrace();
}
}
return questions;
}
```
c) 使用上述组件设计和实现 GUI:菜单、显示问题和答案的能力、选择答案、显示结果和分数以及继续下一个问题的能力。可以使用 Java Swing 来实现 GUI,例如:
```
public class QuizGUI extends JFrame implements ActionListener {
private List<Question> questions;
private int currentQuestionIndex;
private JLabel questionLabel;
private ButtonGroup answerButtonGroup;
private JRadioButton[] answerRadioButtons;
private JButton nextButton;
private JLabel scoreLabel;
// Constructor
public QuizGUI(List<Question> questions) {
this.questions = questions;
currentQuestionIndex = 0;
questionLabel = new JLabel();
answerButtonGroup = new ButtonGroup();
answerRadioButtons = new JRadioButton[4];
for (int i = 0; i < answerRadioButtons.length; i++) {
answerRadioButtons[i] = new JRadioButton();
answerButtonGroup.add(answerRadioButtons[i]);
}
nextButton = new JButton("Next");
scoreLabel = new JLabel("Score: 0");
// Add components to container and set layout
...
// Set JFrame properties and show
...
}
// Show the current question
public void showCurrentQuestion() {
Question question = questions.get(currentQuestionIndex);
questionLabel.setText(question.getText());
String[] answers = question.getAnswers();
for (int i = 0; i < answerRadioButtons.length; i++) {
answerRadioButtons[i].setText(answers[i]);
}
}
// Handle user interactions
@Override
public void actionPerformed(ActionEvent e) {
// Handle menu item clicks
if (e.getSource() instanceof JMenuItem) {
JMenuItem menuItem = (JMenuItem) e.getSource();
if (menuItem.getText().equals("Exit")) {
int result = JOptionPane.showConfirmDialog(this, "Are you sure you want to exit?", "Confirm Exit", JOptionPane.YES_NO_OPTION);
if (result == JOptionPane.YES_OPTION) {
System.exit(0);
}
}
}
// Handle answer selection
else if (e.getSource() instanceof JRadioButton) {
int selectedAnswerIndex = -1;
for (int i = 0; i < answerRadioButtons.length; i++) {
if (answerRadioButtons[i].isSelected()) {
selectedAnswerIndex = i;
break;
}
}
if (selectedAnswerIndex != -1) {
Question question = questions.get(currentQuestionIndex);
if (selectedAnswerIndex == question.getCorrectAnswerIndex()) {
answerRadioButtons[selectedAnswerIndex].setForeground(Color.GREEN);
scoreLabel.setText("Score: " + (currentQuestionIndex + 1));
} else {
answerRadioButtons[selectedAnswerIndex].setForeground(Color.RED);
answerRadioButtons[question.getCorrectAnswerIndex()].setForeground(Color.GREEN);
}
answerButtonGroup.clearSelection();
nextButton.setEnabled(true);
}
}
// Handle next question
else if (e.getSource() == nextButton) {
currentQuestionIndex++;
if (currentQuestionIndex < questions.size()) {
showCurrentQuestion();
nextButton.setEnabled(false);
} else {
JOptionPane.showMessageDialog(this, "Quiz complete!");
}
}
}
// Main method
public static void main(String[] args) {
List<Question> questions = loadQuestionsFromFile();
QuizGUI quizGUI = new QuizGUI(questions);
}
}
```
d) 编写一个方法以在您设计的 GUI 上显示问题。可以在 QuizGUI 类中实现一个名为 showCurrentQuestion() 的方法,该方法在 GUI 中显示当前问题。
e) 实现一个 actionPerforming 方法来响应用户与 GUI 的交互。可以在 QuizGUI 类中实现 actionPerformed() 方法,该方法响应用户与 GUI 的交互,例如选择答案、点击下一步按钮等。
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