JOptionPane似乎导致JPanel消失
我正在开展一个测验计划，如果没有回答所有问题，会出现一个JOptionpane确认对话框，询问用户是否要继续。起初，一切都运行正常，然后我决定在整个程序中使用paintComponent（）方法。在此实现之后，如果弹出此JOptionpane，则包含的Jpanel将消失（将所有问题显示出来），然后只有背景保持可见。一整天都在这。这是发生问题的代码：
/*
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* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package operator;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;
import javax.swing.JOptionPane;
import static operator.Rules.examTimer;
import static operator.Welcome.image;
/**
*
* @author Hendy
*/
public class QuestionExams extends javax.swing.JPanel {
QuestionCall on = new QuestionCall();
int sBtn,nums = on.number();
/**
* Creates new form QuestionExams
*/
public QuestionExams() {
randomQuestion();
initComponents();
if (control == 0)
previousButton.setEnabled(false);
group.add(a);
group.add(b);
group.add(c);
group.add(d);
setSelected();
if (counter>=(maximum()-1) && control >= (maximum()-1))
{nextButton.setText("Finish");
finish.setVisible(false);}
if (counter== maximum() && control == maximum())
{
determinant();
}
}
public void determinant(){
if (checkAdd()<maximum())
{
{
sBtn = JOptionPane.showConfirmDialog(null, " Do you want to finish the exam?\n "
+ "Some questions are still unanswered",
"Proceed?",
JOptionPane.YES_NO_OPTION);
if (sBtn == JOptionPane.YES_OPTION)
{ wrongsAdd();
nextPage();
System.out.println("this shows the question key:"+wrongs.get(0));
System.out.println("this shows the question number:"+wrongNos.get(0));}
else
{
on.numberBack();
selection();
--control;
--key;
removeAll();
setLayout(new FlowLayout());
setLayout( new BorderLayout() );
invalidate();
QuestionExams oan = new QuestionExams();
add(oan,BorderLayout.NORTH );
revalidate();
System.out.println("counter:"+counter +" and "+"control:" +control);
}
}
}
else
{
wrongsAdd();
nextPage();
}
}
public void paintComponent(Graphics g)
{
g.drawImage(image, 0, 0, null);
repaint();
}
@SuppressWarnings("unchecked")
private void initComponents() {
group = new javax.swing.ButtonGroup();
jPanel2 = new javax.swing.JPanel();
jPanel3 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
examTiming = new javax.swing.JLabel();
jPanel1 = new javax.swing.JPanel();
jLabel2 = new javax.swing.JLabel();
jScrollPane2 = new javax.swing.JScrollPane();
nameQ = new javax.swing.JTextArea();
jPanel4 = new javax.swing.JPanel();
jLabel5 = new javax.swing.JLabel();
jLabel6 = new javax.swing.JLabel();
a = new javax.swing.JRadioButton();
jLabel7 = new javax.swing.JLabel();
jLabel8 = new javax.swing.JLabel();
b = new javax.swing.JRadioButton();
c = new javax.swing.JRadioButton();
d = new javax.swing.JRadioButton();
jScrollPane1 = new javax.swing.JScrollPane();
optA = new javax.swing.JTextArea();
jScrollPane3 = new javax.swing.JScrollPane();
optB = new javax.swing.JTextArea();
jScrollPane4 = new javax.swing.JScrollPane();
optC = new javax.swing.JTextArea();
jScrollPane5 = new javax.swing.JScrollPane();
optD = new javax.swing.JTextArea();
quitButton = new javax.swing.JButton();
previousButton = new javax.swing.JButton();
nextButton = new javax.swing.JButton();
finish = new javax.swing.JButton();
private void finishActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
removeAll();
setLayout(new FlowLayout());
setLayout( new BorderLayout() );
invalidate();
AnswerCheck an = new AnswerCheck();
add(an, BorderLayout.NORTH );
revalidate();
wrongsAdd();
}
private void nextButtonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
{
selection();
if(control==counter){
{newAnswer();
{if ((QuestionCall.display6E(balance.get(key+1))+ "").equals(objective.get(control)))
scores=1;
else
scores =0;}
newScore();
if ("nothing".equals(value)){
check=0;
newCheck();
}
}
++counter;}
if (control<counter){
replaceAnswer();
{if ((QuestionCall.display6E(balance.get(key+1))+ "").equals(objective.get(control)))
scores=1;
else
scores =0;}
changeScore();
if ("nothing".equals(value)){
check=0;
validateCheck();
}
}
++control;
System.out.println(QuestionCall.display6E(balance.get(key+1)));
++key;
removeAll();
setLayout( new BorderLayout() );
invalidate();
QuestionExams oan = new QuestionExams();
add(oan,BorderLayout.NORTH );
revalidate();
System.out.println(key);
System.out.println("counter:"+counter +" and "+"control:" +control+" position: "+position);
}
}
private void previousButtonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
on.numberBack();
selection();
--control;
--key;
removeAll();
setLayout(new FlowLayout());
setLayout( new BorderLayout() );
invalidate();
QuestionExams oan = new QuestionExams();
add(oan,BorderLayout.NORTH );
revalidate();
System.out.println(QuestionCall.display6E(balance.get(key+1)));
System.out.println(key);
System.out.println("counter:"+counter +" and "+"control:" +control);
}
private void quitButtonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
int select = JOptionPane.showConfirmDialog(null, "Do you really want to quit the test?",
"Quit?",
JOptionPane.YES_NO_OPTION);
if (select == JOptionPane.YES_OPTION)
// to
{
examTimer.stop();
on.clearFramework();
removeAll();
setLayout(new FlowLayout());
setLayout( new BorderLayout() );
invalidate();
oktest an = new oktest();
add(an, BorderLayout.NORTH );
revalidate();}
}
}
private javax.swing.JRadioButton a;
private javax.swing.JRadioButton b;
private javax.swing.JRadioButton c;
private javax.swing.JRadioButton d;
public static javax.swing.JLabel examTiming;
private javax.swing.JButton finish;
private javax.swing.ButtonGroup group;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel6;
private javax.swing.JLabel jLabel7;
private javax.swing.JLabel jLabel8;
private javax.swing.JPanel jPanel1;
public javax.swing.JPanel jPanel2;
private javax.swing.JPanel jPanel3;
private javax.swing.JPanel jPanel4;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JScrollPane jScrollPane3;
private javax.swing.JScrollPane jScrollPane4;
private javax.swing.JScrollPane jScrollPane5;
private javax.swing.JTextArea nameQ;
private javax.swing.JButton nextButton;
private javax.swing.JTextArea optA;
private javax.swing.JTextArea optB;
private javax.swing.JTextArea optC;
private javax.swing.JTextArea optD;
private javax.swing.JButton previousButton;
private javax.swing.JButton quitButton;
}
大多数布局代码都被遗漏了。为清晰起见，我还包括一些图像。
首先是最后一个问题页面
接下来是当我点击下一个按钮（现在标记为完成）时会发生什么
最后，这是原始的工作，在我做paintComponent（）方法之前，不幸的是，
我没有这个的代码（我只有.exe文件）
我不知道它是否是一个错误，因为Quit按钮也显示了它自己的选项窗格，并且显示完美。
2 个答案:
答案 0 :(得分：0)
解决了它。我不太确定错误来自哪里，所以我决定创建自己的yes-no对话框。它起初工作正常，但是当我将其设置为模态时，它与JOptionPane具有相同的问题，这使我得出结论，它是导致它的JOptionPane的模态属性。但是通过将JOptionPane操作移动到下一个按钮而不是构造函数，事件发生了，就像正常一样。
答案 1 :(得分：-1)
不太确定，但尝试完全在另一个线程中启动弹出窗口。这可能有用。
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