Problems with a simple stop watch program
I would appreciate help sorting out a problem with a simple stop watch program. The problem is that it throws up inappropriate values. For example, the first time I ran it today it showed the best time at 19 seconds before the actual time had reached 2 seconds. I restarted the program and it ran correctly until about the thirtieth time I started it again when it was going okay until the display suddenly changed to something like '-50:31:30:50-'. I don't have screenshot because I had twenty thirteen year olds suddenly yelling at me that it was wrong. I clicked 'Stop' and then 'Start' again and it ran correctly.
I have posted the whole code (minus the GUI section) because I want you to see that the program is very, very simple. I can't see where it could go wrong. I would appreciate any hints.
public class StopWatch extends javax.swing.JFrame implements Runnable {
int startTime, stopTime, totalTime, bestTime;
private volatile Thread myThread = null;
/** Creates new form StopWatch */
public StopWatch() {
startTime = 0;
stopTime = 0;
totalTime = 0;
bestTime = 0;
initComponents();
public void run() {
Thread thisThread = Thread.currentThread();
while(myThread == thisThread) {
try {
Thread.sleep(100);
getEnd();
} catch (InterruptedException e) {}
public void start() {
if(myThread == null) {
myThread = new Thread(this);
myThread.start();
public void getStart() {
Calendar now = Calendar.getInstance();
startTime = (now.get(Calendar.MINUTE) * 60) + now.get(Calendar.SECOND);
public void getEnd() {
Calendar now1 = Calendar.getInstance();
stopTime = (now1.get(Calendar.MINUTE) * 60) + now1.get(Calendar.SECOND);
totalTime = stopTime - startTime;
setLabel();
if(bestTime < totalTime) bestTime = totalTime;
public void setLabel() {
if((totalTime % 60) < 10) {
jLabel1.setText(""+totalTime/60+ ":0"+(totalTime % 60));
} else {
jLabel1.setText(""+totalTime/60 + ":"+(totalTime % 60));
if((bestTime % 60) < 10) {
jLabel3.setText(""+bestTime/60+ ":0"+(bestTime % 60));
} else {
jLabel3.setText(""+bestTime/60 + ":"+(bestTime % 60));
private void ButtonClicked(java.awt.event.ActionEvent evt) {
JButton temp = (JButton) evt.getSource();
if(temp.equals(jButton1)) {
start();
getStart();
if(temp.equals(jButton2)) {
getEnd();
myThread = null;
* @param args the command line arguments
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new StopWatch().setVisible(true);
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JPanel jPanel1;
// End of variables declaration
}
Although I appreciate this information, it still doesn't actually solve the problem. I can't see an error in the logic (or the code). The fact that the formatting works most of the time suggests that the problem does not lie there. As well, I use the same basic code for other time related displays e.g. countdown timers where the user sets a maximum time and the computer stops when zero is reached. I haven't had an error is these programs.
For me, it is such a simple program and the room for errors seem small. I am guessing that I have misunderstood something about dates, but I obviously don't know.
Again, thank you for taking the time to look at the problem and post a reply.
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break;
case 4:
testForm();
break;
the code is so simple. i think that the problem is on the j2me wirless toolkit but i don't know.
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