Java GUI thread problem

[rvy2k]

Hi all,

I have a JFrame that implements Runnable. This creates a thread that does some work, While it is doing the work, I would like the JFrame/Thread to wait. The problem is that the JFrame just freezes. I tried multiple things Thread.join, Thread.wait, monitor with synchronized method unsuccessfully.

Below is a simpler code snippet that has the same problem.

Can somebody help?
Thanks.

//// Frame Class //////////////////////////////////////////////////////

public class TestFrame extends javax.swing.JFrame implements Runnable {

Thread thread;

/** Creates new form TestFrame */
public TestFrame() {
thread = new Thread(this);
initComponents();
this.setSize(120,60);
this.setVisible(true);
}

private void initComponents() {
panel = new javax.swing.JPanel();
button = new javax.swing.JButton();

addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent evt) {
exitForm(evt);
}
});

panel.setLayout(null);

button.setText("run thread"
button.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
buttonActionPerformed(evt);
}
});

panel.add(button);
button.setBounds(0, 0, 120, 26);

getContentPane().add(panel, java.awt.BorderLayout.CENTER);

pack();
}

private void buttonActionPerformed(java.awt.event.ActionEvent evt) {
System.out.println("starting"
TestThread t = new TestThread();
while(!t.isDone) {
try {
thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.println("done"
}

/** Exit the Application */
private void exitForm(java.awt.event.WindowEvent evt) {
System.exit(0);
}

public static void main(String args[]) {
new TestFrame();
}

public void run() {

}
// Variables declaration - do not modify
private javax.swing.JPanel panel;
private javax.swing.JButton button;
// End of variables declaration

}

//// Thread Class //////////////////////////////////////////////////////

public class TestThread implements Runnable {

Thread thread;
boolean isDone = false;

public TestThread() {
thread = new Thread(this);
thread.start();
}

public void run() {
for(int i=0;i<10000;i++) {
int n = 0;
for(int j=0;j<100000;j++) {
n += j;
}
}
isDone = true;
}

}

 

[JavaDude32]

Hmm, have you tried creating the Thread in your main class, in the :

private void buttonActionPerformed (java.awt.event.ActionEvent evt) {
System.out.println(&quot;starting&quot;
TestThread t = new TestThread();
while(!t.isDone) {

such as
TestThread t = new TestThread();
Thread kicker = new Thread(t, &quot;Thread 2&quot;
kicker.start();

plus also looks like your code will take awhile to execute in that for loop, how long are you waiting? Given that your code perhaps executes at 1 ns per interation of the inner loop, it would still take roughly 17 minutes. I'd also keep track of that loop and print out the variable's i and j in there, making sure the thread isn't being interrupted, calling run again thus restarting the loop. If it is, I'd suggest a synchronized run method.

JavaDude32

 

[JavaDude32]

Err, 17 mins with a microsecond, 10 seconds with a nanosecond. Oops.