public class QuizPlay {
JFrame frame;
JPanel mainPanel;
JButton button;
GridBagConstraints gbc;
ArrayList<String> questions;
ArrayList<String> answers;
boolean isShown;
Iterator<String> ita;
Iterator<String> itq;
JTextArea textArea;
public static void main(String[] args) {
QuizPlay quiz = new QuizPlay();
quiz.loadLists(quiz.chooseFile());
quiz.setupGui();
}
public QuizPlay() {
frame = new JFrame();
mainPanel = new JPanel(new GridBagLayout());
questions = new ArrayList<>();
answers = new ArrayList<>();
gbc = new GridBagConstraints();
textArea = new JTextArea();
}
public void setupGui() {
mainPanel.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
frame.setVisible(true);
frame.add(mainPanel);
frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
button = new JButton("Begin");
button.setPreferredSize(new Dimension(150, 70));
button.addActionListener(buttonListener);
gbc.gridx = 0;
gbc.gridy = 2;
mainPanel.add(button, gbc);
gbc.gridy = 1;
mainPanel.add(Box.createRigidArea(new Dimension(10, 10)), gbc);
Font font = new Font("sanserif", Font.BOLD, 24);
textArea.setFont(font);
textArea.setForeground(Color.BLACK);
textArea.setEnabled(false);
textArea.setPreferredSize(new Dimension(400, 400));
gbc.weighty = 1;
gbc.anchor = GridBagConstraints.PAGE_START;
gbc.gridx = 0;
gbc.gridy = 0;
mainPanel.add(textArea, gbc);
frame.pack();
}
public void loadLists(File file) {
try {
BufferedReader reader = new BufferedReader(new FileReader(file));
String line;
while ((line = reader.readLine()) != null) {
questions.add(line.split("/")[0]);
answers.add(line.split("/")[1]);
ita = answers.iterator();
itq = questions.iterator();
}
} catch (Throwable e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public File chooseFile() {
JFileChooser chooser = new JFileChooser();
chooser.showOpenDialog(frame);
return chooser.getSelectedFile();
}
ActionListener buttonListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
if (isShown == false && itq.hasNext()) {
textArea.setText(itq.next());
button.setText("Show Answer");
isShown = true;
}
else if (isShown == true && ita.hasNext()) {
textArea.append("\n" + ita.next());
button.setText("Next");
isShown = false;
}
else
button.setText("Done!");
}
};
}
我有以下程序从文件中读取问题和答案，并在屏幕上显示它们以测试用户知识（有点像测验卡）。但出于某种原因，当这个程序开始时，由于某种原因，框架全部变为黑色约2秒。有人可以指出导致这个奇怪的错误的原因。