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我是团队的一部分，为学生创建一个测试，在他们必须参加认证测试之前习惯某种格式。测试是四个小时长，因为我正在试图实现计时器，我看到了不寻常的模式。爪哇摇摆计时器不会减少正确的方式，并且不会在正确的时间开始
我希望计时器在4小时（以HH：MM：SS格式）启动并倒计时到全零，不幸的是它开始于11:00:00并倒计时到07:00:00。
下一个问题是定时器必须显示在两个不同的页面之间。实际参加考试和复习页面。当我在页面之间切换回来和第四次时，计数器开始递减递减多倍的页面间点击次数。
下面是我创建的计时器类，参加测验并提交评论。代码并不完美，需要工作，但我需要一个GUI模拟来呈现。
任何帮助，将不胜感激。谢谢。
小测验
package edu.kings.pexam.student;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
public class TakeQuiz extends JFrame implements ActionListener {
private static final long serialVersionUID = 1L;
private JButton submit;
private JButton show;
static QuizTimer timer;
/**
* @param args
*/
public static void main(String[] args){
TakeQuiz window = new TakeQuiz();
window.setVisible(true);
}
public TakeQuiz(){
setExtendedState(JFrame.MAXIMIZED_BOTH);
JPanel upperPanel = new JPanel(new GridLayout(2,8));
upperPanel.setPreferredSize(new Dimension(WIDTH,100));
upperPanel.setBackground(Color.lightGray);
this.add(upperPanel,BorderLayout.NORTH);
JPanel lowerPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
lowerPanel.setBackground(Color.white);
this.add(lowerPanel, BorderLayout.CENTER);
Font font = new Font("Dialog",Font.PLAIN,17);
Font buttonFont = new Font("Dialog",Font.PLAIN,13);
Font textButtonFont = new Font("Dialog",Font.PLAIN+Font.BOLD,13);
Font submitButtonFont = new Font("Dialog", Font.PLAIN + Font.BOLD,15);
//adding the questions buttons to the upper panel
JPanel questionPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
questionPanel.setBackground(Color.lightGray);
JButton firstQuestion = new JButton("<<");
firstQuestion.setFont(buttonFont);
questionPanel.add(firstQuestion);
//space to help button line up with text
JPanel spacer1 = new JPanel();
spacer1.setBackground(Color.lightGray);
questionPanel.add(spacer1);
JButton perviousQuestion = new JButton("<");
perviousQuestion.setFont(buttonFont);
questionPanel.add(perviousQuestion);
//space to help button line up with text
JPanel spacer2 = new JPanel();
spacer2.setBackground(Color.lightGray);
questionPanel.add(spacer2);
JButton nextQuestion = new JButton(">");
nextQuestion.setFont(buttonFont);
questionPanel.add(nextQuestion);
//space to help button line up with text
JPanel spacer3 = new JPanel();
spacer3.setBackground(Color.lightGray);
questionPanel.add(spacer3);
JButton lastQuestion = new JButton(">>");
lastQuestion.setFont(buttonFont);
questionPanel.add(lastQuestion);
upperPanel.add(questionPanel);
//adding the goto button to the upper panel
JPanel goToPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
goToPanel.setBackground(Color.lightGray);
JButton goTo = new JButton("Go To");
goTo.setFont(textButtonFont);
goToPanel.add(goTo);
upperPanel.add(goToPanel);
//adding the flag buttons to the upper panel
JPanel flagPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
flagPanel.setBackground(Color.lightGray);
JButton flagP = new JButton("< Flag");
flagP.setFont(textButtonFont);
flagPanel.add(flagP);
JButton flag = new JButton("Flag");
flag.setFont(textButtonFont);
flagPanel.add(flag);
JButton flagN = new JButton("Flag >");
flagN.setFont(textButtonFont);
flagPanel.add(flagN);
upperPanel.add(flagPanel);
//adding help and hide/show timer buttons to the upper panel
JPanel timerPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
timerPanel.setBackground(Color.lightGray);
JButton help = new JButton("Help");
help.setFont(textButtonFont);
timerPanel.add(help);
show = new JButton("Show/Hide Timer");
show.setFont(textButtonFont);
show.addActionListener(this);
timerPanel.add(show);
upperPanel.add(timerPanel);
//adding space panels
JPanel spacePanel1 = new JPanel();
JPanel spacePanel2 = new JPanel();
spacePanel1.setBackground(Color.lightGray);
spacePanel2.setBackground(Color.lightGray);
upperPanel.add(spacePanel1);
upperPanel.add(spacePanel2);
//adding the submit button to the upper panel
JPanel submitPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
submitPanel.setBackground(Color.lightGray);
submit = new JButton("Submit Quiz");
submit.setFont(submitButtonFont);
submit.addActionListener(this);
submitPanel.add(submit);
upperPanel.add(submitPanel);
//adding the question button text to the upper panel
JPanel questionText = new JPanel(new FlowLayout(FlowLayout.LEFT));
questionText.setBackground(Color.lightGray);
JLabel label2 = new JLabel("<html><center>First<br></br>Question</center></html>");
label2.setFont(textButtonFont);
questionText.add(label2);
JLabel label4 = new JLabel("<html><center>Perivous<br></br>Question</center></html>");
label4.setFont(textButtonFont);
questionText.add(label4);
JLabel label6 = new JLabel("<html><center>Next<br></br>Question</center></html>");
label6.setFont(textButtonFont);
questionText.add(label6);
JLabel label8 = new JLabel("<html><center>Last<br></br>Question</center></html>");
label8.setFont(textButtonFont);
questionText.add(label8);
upperPanel.add(questionText);
//adding text box for go to button
JPanel textGoTo = new JPanel(new FlowLayout(FlowLayout.CENTER));
textGoTo.setBackground(Color.lightGray);
JPanel upper10 = new JPanel();
upper10.setBackground(Color.lightGray);
JTextField goToText = new JTextField("1",2);
JLabel label10 = new JLabel("/25");
label10.setFont(font);
upper10.add(goToText,BorderLayout.CENTER);
upper10.add(label10,BorderLayout.CENTER);
textGoTo.add(upper10);
upperPanel.add(textGoTo);
//adding spacer to the upper panel
JPanel spacePanel3 = new JPanel();
spacePanel3.setBackground(Color.lightGray);
upperPanel.add(spacePanel3);
//adding the timer to the upper panel
JPanel timePanel = new JPanel();
timePanel.setBackground(Color.lightGray);
timer = new QuizTimer();
timer.start();
JPanel upper20 = new JPanel();
upper20.setBackground(Color.lightGray);
upper20.add(timer.getTimeLabel(),BorderLayout.CENTER);
timePanel.add(upper20);
upperPanel.add(timePanel);
//adding two more space panels
JPanel spacePanel4 = new JPanel();
JPanel spacePanel5 = new JPanel();
spacePanel4.setBackground(Color.lightGray);
spacePanel5.setBackground(Color.lightGray);
upperPanel.add(spacePanel4);
upperPanel.add(spacePanel5);
//adding the questions to the lower panel
JPanel lower1 = new JPanel(new GridLayout(4,1));
lower1.setBackground(Color.white);
JLabel question = new JLabel("<html>The parents of a 16-year-old swimmer contact an athletic trainer seeking nutritional advice for the athlete's pre-event<br><\bmeal. What recommendation should the athletic trainer share share with the parents regrading ideal pre-event meals?</html>");
question.setFont(new Font("Dialog", Font.PLAIN+Font.BOLD, 18));
JPanel answer = new JPanel(new GridLayout(6,1));
answer.setBackground(Color.white);
JLabel type = new JLabel("Choose all that apply.");
type.setFont(new Font("Dialog", Font.PLAIN+Font.BOLD+Font.ITALIC, 20));
JPanel answerA = new JPanel(new FlowLayout(FlowLayout.LEFT));
answerA.setBackground(Color.white);
JRadioButton a = new JRadioButton();
a.setBackground(Color.white);
a.setSize(25,25);
JLabel aFill = new JLabel("Include foods high in carbohydrates, high in proteins , and low in fats");
aFill.setFont(font);
answerA.add(a);
answerA.add(aFill);
JPanel answerB = new JPanel(new FlowLayout(FlowLayout.LEFT));
answerB.setBackground(Color.white);
JRadioButton b = new JRadioButton();
b.setBackground(Color.white);
b.setSize(25,25);
JLabel bFill = new JLabel("Prepare meals without diuretics foods");
bFill.setFont(font);
answerB.add(b);
answerB.add(bFill);
JPanel answerC = new JPanel(new FlowLayout(FlowLayout.LEFT));
answerC.setBackground(Color.white);
JRadioButton c = new JRadioButton();
c.setBackground(Color.white);
c.setSize(25,25);
JLabel cFill = new JLabel("Prepare meals for eating four hours prior to the competition");
cFill.setFont(font);
answerC.add(c);
answerC.add(cFill);
JPanel answerD = new JPanel(new FlowLayout(FlowLayout.LEFT));
answerD.setBackground(Color.white);
JRadioButton d = new JRadioButton();
d.setBackground(Color.white);
d.setSize(25,25);
JLabel dFill = new JLabel("Prepare meals with food that delay gastric emptying");
dFill.setFont(font);
answerD.add(d);
answerD.add(dFill);
JPanel record = new JPanel(new FlowLayout(FlowLayout.LEFT));
record.setBackground(Color.lightGray);
JLabel unanswered = new JLabel("Unanswered: ");
unanswered.setFont(font);
record.add(unanswered);
JLabel unansweredNumber = new JLabel("25");
unansweredNumber.setFont(font);
unansweredNumber.setForeground(Color.blue);
record.add(unansweredNumber);
JLabel space1 = new JLabel();
record.add(space1);
JLabel answered = new JLabel("Answered: ");
answered.setFont(font);
record.add(answered);
JLabel answeredNumber = new JLabel("0");
answeredNumber.setFont(font);
answeredNumber.setForeground(Color.blue);
record.add(answeredNumber);
JLabel space2 = new JLabel();
record.add(space2);
JLabel flagged = new JLabel("Flagged: ");
flagged.setFont(font);
record.add(flagged);
JLabel flaggedNumber = new JLabel("0");
flaggedNumber.setFont(font);
flaggedNumber.setForeground(Color.blue);
record.add(flaggedNumber);
answer.add(type);
answer.add(answerA);
answer.add(answerB);
answer.add(answerC);
answer.add(answerD);
answer.add(record);
lower1.add(question);
lower1.add(answer);
lowerPanel.add(lower1);
getContentPane().setBackground(Color.white);
upperPanel.setVisible(true);
lowerPanel.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == submit){
SubmitReview reviewScreen = new SubmitReview();
this.setVisible(false);
reviewScreen.setVisible(true);
}else if(e.getSource() == show){
if(timer.getTimeLabel().isVisible() == true){
timer.getTimeLabel().setVisible(false);
}else{
timer.getTimeLabel().setVisible(true);
}
}
}
}
最后提交
package edu.kings.pexam.student;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class SubmitReview extends JFrame implements ActionListener {
private static final long serialVersionUID = 1L;
private JButton hideTimerButton;
private JButton showTimerButton;
private JComboBox<String> languageBox;
private JButton returnToQuizButton;
private JButton endQuizButton;
private JTextField textEnter;
static QuizTimer timer = TakeQuiz.timer;
/**
* Runs the program to produce the screen for submission review.
* @param args
*/
public static void main(String[] args){
SubmitReview window = new SubmitReview();
//sets the window visible
window.setVisible(true);
}
public SubmitReview(){
//Extends the screen to maximum size
setExtendedState(JFrame.MAXIMIZED_BOTH);
//Creates a panel that will keep items pushed to the right.
JPanel leftPanel = new JPanel();
leftPanel.setPreferredSize(new Dimension(200,HEIGHT));
leftPanel.setBackground(Color.white);
this.add(leftPanel,BorderLayout.WEST);
//Panel where everything on page will go.
JPanel rightPanel = new JPanel(new GridLayout(10,1));
rightPanel.setBackground(Color.white);
this.add(rightPanel, BorderLayout.CENTER);
//font for the text
Font textFont = new Font("Dialog",Font.PLAIN,15);
//First panel in the grid. Grid moves from top to bottom.
JPanel panel0 = new JPanel(new FlowLayout(FlowLayout.RIGHT));
panel0.setBackground(Color.white);
//hide timer button, visible when timer is shown.
hideTimerButton = new JButton("Hide Timer");
hideTimerButton.setBackground(Color.lightGray);
Dimension hideTimerDimension = new Dimension(100,25);
hideTimerButton.setSize(hideTimerDimension);
hideTimerButton.setMinimumSize(hideTimerDimension);
hideTimerButton.setMaximumSize(hideTimerDimension);
hideTimerButton.setPreferredSize(hideTimerDimension);
hideTimerButton.setVisible(true);
//show timer button, visible when timer is not shown.
showTimerButton = new JButton("Show Timer");
showTimerButton.setBackground(Color.lightGray);
Dimension showTimerDimension = new Dimension(125, 25);
showTimerButton.setSize(showTimerDimension);
showTimerButton.setMinimumSize(showTimerDimension);
showTimerButton.setMaximumSize(showTimerDimension);
showTimerButton.setPreferredSize(showTimerDimension);
showTimerButton.setVisible(false);
//creates functionality for the show and hide timer buttons
hideTimerButton.addActionListener(this);
showTimerButton.addActionListener(this);
panel0.add(timer.getTimeLabel());
panel0.add(hideTimerButton);
panel0.add(showTimerButton);
rightPanel.add(panel0);
//Second panel in the grid.
JPanel panel1 = new JPanel(new FlowLayout(FlowLayout.LEFT));
panel1.setBackground(Color.white);
//Splits this panel into a grid
JPanel grid = new JPanel(new GridLayout(2,1));
//A Panel to hold the language drop down menu
JPanel languagePanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
languagePanel.setBackground(Color.white);
//Creates a combo box of languages (drop down menu)
String[] languages = {"English", "Spanish", "French", "Portuguese" };
languageBox = new JComboBox<String>(languages);
languageBox.setBackground(Color.white);
languageBox.addActionListener(this);
languagePanel.add(languageBox);
//Text under the combo box
JPanel textPanel = new JPanel();
JLabel text = new JLabel("Do you want to end your exam now?");
Font font = new Font("Dialog",Font.PLAIN,17);
text.setFont(font);
textPanel.setBackground(Color.white);
textPanel.add(text);
grid.add(languagePanel);
grid.add(textPanel);
//Stop sign picture
File stopSign = new File("resources/stop_sign.png");
ImageIcon stopSignIcon = null;
try {
stopSignIcon = new ImageIcon(ImageIO.read(stopSign));
}
catch (IOException e) {
System.out.println("Caught exception:" + e);
}
JLabel stopLabel = new JLabel();
stopLabel.setIcon(stopSignIcon);
stopLabel.setBackground(Color.white);
stopLabel.setBorder(null);
panel1.add(grid);
panel1.add(stopLabel);
rightPanel.add(panel1);
//third panel in the grid
JPanel panel2 = new JPanel(new FlowLayout(FlowLayout.LEFT));
panel2.setBackground(Color.white);
//splits the panel into a grid
JPanel textArea2 = new JPanel(new GridLayout(2,1));
textArea2.setBackground(Color.white);
JPanel warningText1 = new JPanel(new FlowLayout(FlowLayout.RIGHT));
warningText1.setBackground(Color.white);
JLabel warningText1Point = new JLabel("<html><li>You left the following questions unanswered. If you end your exam now,<b> you lose the chance to answer these questions.</b></html>");
warningText1Point.setFont(textFont);
warningText1.add(warningText1Point);
JPanel breakPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
breakPanel.setBackground(Color.white);
JLabel space = new JLabel("<html><t> </t></html>");
breakPanel.add(space);
//adds FAKE question buttons to the panel
JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
buttonPanel.setBackground(Color.white);
JButton one = new JButton("1");
JButton two = new JButton("5");
JButton three = new JButton("12");
one.setBackground(Color.lightGray);
two.setBackground(Color.lightGray);
three.setBackground(Color.lightGray);
buttonPanel.add(one);
buttonPanel.add(two);
buttonPanel.add(three);
breakPanel.add(buttonPanel);
textArea2.add(warningText1);
textArea2.add(breakPanel);
panel2.add(textArea2);
rightPanel.add(panel2);
//fourth panel in the grid
JPanel panel3 = new JPanel(new FlowLayout(FlowLayout.LEFT));
panel3.setBackground(Color.white);
JPanel textArea3 = new JPanel(new GridLayout(2,1));
textArea3.setBackground(Color.white);
JPanel warningText3 = new JPanel(new FlowLayout(FlowLayout.RIGHT));
warningText3.setBackground(Color.white);
JLabel warningText3Point = new JLabel("<html><li>You marked the following questions for later review. If you end your exam now, <b>you lose the chance to review these marked questions.</b></html>");
textArea3.setBackground(Color.white);
warningText3Point.setFont(textFont);
JPanel breakPanel3 = new JPanel(new FlowLayout(FlowLayout.LEFT));
breakPanel3.setBackground(Color.white);
JLabel space3 = new JLabel("<html><t> </t></html>");
breakPanel3.add(space3);
JPanel buttonPanel3 = new JPanel(new FlowLayout(FlowLayout.RIGHT));
buttonPanel3.setBackground(Color.white);
JButton four = new JButton("4");
JButton five = new JButton("9");
JButton six = new JButton("20");
four.setBackground(Color.lightGray);
five.setBackground(Color.lightGray);
six.setBackground(Color.lightGray);
buttonPanel3.add(four);
buttonPanel3.add(five);
buttonPanel3.add(six);
breakPanel3.add(buttonPanel3);
textArea3.add(warningText3Point);
textArea3.add(warningText3);
textArea3.add(breakPanel3);
panel3.add(textArea3);
rightPanel.add(panel3);
//fifth panel in the grid
JPanel panel4 = new JPanel(new FlowLayout(FlowLayout.LEFT));
panel4.setBackground(Color.white);
JPanel grid4 = new JPanel(new GridLayout(2,1));
grid4.setBackground(Color.white);
JPanel border4 = new JPanel(new GridLayout(1,2));
border4.setBackground(Color.white);
JPanel spacer4 = new JPanel();
spacer4.setBackground(Color.white);
JPanel button4 = new JPanel();
button4.setBackground(Color.white);
returnToQuizButton = new JButton("No. Return to the Quiz");
returnToQuizButton.setBackground(Color.lightGray);
returnToQuizButton.addActionListener(this);
button4.add(returnToQuizButton,BorderLayout.SOUTH);
JPanel textPanel4 = new JPanel(new FlowLayout(FlowLayout.LEFT));
textPanel4.setBackground(Color.white);
JLabel label4 = new JLabel("<html><li>You still have time remaining.</b></html>");
label4.setFont(textFont);
textPanel4.add(label4);
border4.add(spacer4);
border4.add(button4);
grid4.add(textPanel4);
grid4.add(border4);
panel4.add(grid4);
rightPanel.add(panel4);
//sixth panel in the grid
JPanel panel5 = new JPanel(new FlowLayout(FlowLayout.LEFT));
panel5.setBackground(Color.white);
JPanel textPanel5 = new JPanel(new FlowLayout(FlowLayout.LEFT));
textPanel5.setBackground(Color.white);
JLabel text5 = new JLabel("<html><li>If you end your exam now,<b> you cannot return to the exam.</b></html>");
text5.setFont(textFont);
textPanel5.add(text5);
panel5.add(textPanel5);
rightPanel.add(panel5);
//seventh panel in the grid
JPanel panel6 = new JPanel(new FlowLayout(FlowLayout.LEFT));
panel6.setBackground(Color.white);
JPanel textPanel6 = new JPanel(new FlowLayout(FlowLayout.LEFT));
textPanel6.setBackground(Color.white);
JLabel text6 = new JLabel("If you are ready to end the multiple-choice exam now, type the words 'I understand' in the box below.");
text6.setFont(textFont);
textPanel6.add(text6);
panel6.add(textPanel6);
rightPanel.add(panel6);
//eight panel in the grid
JPanel panel7 = new JPanel(new FlowLayout(FlowLayout.CENTER));
panel7.setBackground(Color.white);
textEnter = new JTextField("Type 'I understand' here.");
textEnter.setFont(textFont);
textEnter.setColumns(13);
//clears box on click of mouse
textEnter.addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent e){
textEnter.setText("");
}
});
textEnter.addActionListener(this);
JPanel textHolder = new JPanel();
textHolder.setBackground(Color.white);
textHolder.add(textEnter,BorderLayout.CENTER);
panel7.add(textHolder);
rightPanel.add(panel7);
//ninth panel in the grid
JPanel panel8 = new JPanel(new FlowLayout(FlowLayout.CENTER));
panel8.setBackground(Color.white);
endQuizButton = new JButton("Yes. End the Quiz Now");
endQuizButton.setBackground(Color.lightGray);
endQuizButton.addActionListener(this);
endQuizButton.setEnabled(false);
JPanel button8 = new JPanel();
button8.setBackground(Color.white);
button8.add(endQuizButton, BorderLayout.CENTER);
panel8.add(button8);
rightPanel.add(panel8);
getContentPane().setBackground(Color.white);
leftPanel.setVisible(true);
rightPanel.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
@Override
public void actionPerformed(ActionEvent e) {
String text = textEnter.getText();
if(text.equals("I understand")){
endQuizButton.setEnabled(true);
}
if(e.getSource() == hideTimerButton){
hideTimerButton.setVisible(false);
timer.getTimeLabel().setVisible(false);
showTimerButton.setVisible(true);
}else if(e.getSource() == showTimerButton){
showTimerButton.setVisible(false);
hideTimerButton.setVisible(true);
timer.getTimeLabel().setVisible(true);
}else if(e.getSource() == returnToQuizButton){
TakeQuiz quizScreen = new TakeQuiz();
this.setVisible(false);
quizScreen.setVisible(true);
}else if(e.getSource() == endQuizButton){
int response = JOptionPane.showConfirmDialog(null, "Are you sure you want to submit your quiz for grading?","Select an Option", JOptionPane.YES_NO_OPTION);
if(response == JOptionPane.YES_OPTION){
JOptionPane.showMessageDialog(null, "Your grade on this quiz is: 85");
System.exit(0);
}
}
}
}
测验TIMER
package edu.kings.pexam.student;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.Timer;
public class QuizTimer {
private static double time = 1.44*Math.pow(10,7);
private SimpleDateFormat setTime = new SimpleDateFormat("hh:mm:ss");
private JLabel timeLabel;
private Timer countDown;
public QuizTimer(){
countDown = new Timer(1000, new ActionListener(){
public void actionPerformed(ActionEvent e) {
if (time >= 0) {
timeLabel.setText(setTime.format(time));
time = time-1000;
}else{
JOptionPane.showMessageDialog(null, "Your quiz has been automatically submitted for grading.", "Out of Time", JOptionPane.OK_OPTION);
System.exit(0);
}
}
});
timeLabel = new JLabel();
timeLabel.setFont(new Font("Dialog", Font.PLAIN + Font.BOLD,24));
timeLabel.setVisible(true);
}
public JLabel getTimeLabel(){
return timeLabel;
}
public void start(){
countDown.start();
}
}
如果您希望获得帮助，请提供[** SSCCE **]（http://sscce.org/）。 –
考虑显示[这里]（http://stackoverflow.com/q/2704473/230513）所示的方法之一。 – trashgod