运行GUI时没有任何反应 [英] Nothing happens when running GUI
问题描述
我正在为我的班级做一个项目,而我现在正在使用GUI。我没有太多,因为它没有出现,而且令人气愤。这是我的代码。
I'm doing a project for my class and I'm working on the GUI right now. I don't have much because, well, it's not showing up and it's infuriating. Here's my code.
public class BookQuizGUI extends JFrame implements ActionListener
{
private Container c;
private JPanel pnlButtons;
private JButton addQs;
private JButton takeQuiz;
private JButton quit;
private Container c2;
private JPanel pnlButtons2;
private JComboBox qType;
private JComboBox ans;
private JTextField q;
private JTextField cA;
private JTextField cB;
private JTextField cC;
private JTextField cD;
private JButton add;
private JButton writeAll;
private JButton done;
/**
*
*/
public BookQuizGUI()
{
//The main screen for when the program starts
c = getContentPane();
pnlButtons = new JPanel();
pnlButtons.setLayout(new GridLayout(1, 3));
addQs = new JButton("Add Questions");
takeQuiz = new JButton("Take Quiz");
quit = new JButton("Quit");
setTitle("Book Quiz");
setSize(800, 400);
setLocation(400, 250);
setDefaultCloseOperation(EXIT_ON_CLOSE);
pnlButtons.add(addQs);
pnlButtons.add(takeQuiz);
pnlButtons.add(quit);
addQs.addActionListener(this);
takeQuiz.addActionListener(this);
quit.addActionListener(this);
c.add(pnlButtons, BorderLayout.NORTH);
c.setVisible(true);
//The screen for when the user presses "Add questions"
c2 = getContentPane();
pnlButtons2 = new JPanel();
qType = new JComboBox();
qType.addItem("Elementary Question");
qType.addItem("Standard Question");
qType.addItem("Advanced Question");
pnlButtons2.add(qType);
}
/**
* @param args
*/
public static void main(String[] args)
{
BookQuizGUI gui = new BookQuizGUI();
}
@Override
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == quit)
{
System.exit(0);
}
else if(e.getSource() == addQs)
{
c2.setVisible(true);
}
}
}
另一种基本要素我的问题是如何在GUI屏幕之间切换?这段代码应该像书测验一样,你可以添加问题。我只是让一个容器看不见而另一个可见吗?
Another fundamental question of mine is how to go about switching between GUI screens? This code is supposed to have like a book quiz and you can add questions. Do I just make one container not visible and another visible?
推荐答案
你需要打包并将其设置为可见! / p>
You need to pack it and set it to be visible!
frame.pack();
frame.setVisible(true);
至于回答第二个问题,为什么不改变元素并重新绘制()屏幕,如果我知道你希望它像一个有多个问题的测验,对吗?
As for answering your second question, why not just change the elements and repaint() the screen, if I understand you want it to be like a quiz with multiple questions, right?
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