Problem whit ActionListener and static variable

Hi...
I have a FIRSTclass that have many button in the interface, when I click in one button open a small window and into the small window I have a JLabel that set a variable, but the variable is static.
In another SECONDclass I have a THREAD that it has that to change the value of the variable, therefore inside of this SECONDclass that has the THREAD I have that adds thus:
FirstClass.VARIABLE = "this string dumb of time in time";
Well, when I make my JLabel in FIRSTclass where it has the buttons to receive:
JLabel lab = new JLable(VARIABLE);
it gives an error of IndexOfBounds being that mine variav�l is a Arrayde 66 positions;
I want that when to click in the button, to open the small window with the new value of the variable...
Somebody knows what I make?

I am not sure I get your problem, but here is a suggestion anyway...
My guess is that VARIABLE is declared as
<scope> static String VARIABLE;
I would suggest that you try one of these two:
<scope> static volatile String VARAIBLE;
and leave the rest as it is.
or, leave the declaration as it is and:
synchronized(VARIABLE) {
JLabel lab = new JLable(VARIABLE);
}
Hope this helps,
Abhik.

Originally posted by DanielCosta Sobrinho:
Hi...
I have a FIRSTclass that have many button in the interface, when I click in one button open a small window and into the small window I have a JLabel that set a variable, but the variable is static.
In another SECONDclass I have a THREAD that it has that to change the value of the variable, therefore inside of this SECONDclass that has the THREAD I have that adds thus:
FirstClass.VARIABLE = "this string dumb of time in time";
Well, when I make my JLabel in FIRSTclass where it has the buttons to receive:
JLabel lab = new JLable(VARIABLE);
it gives an error of IndexOfBounds being that mine variav?l is a Arrayde 66 positions;
I want that when to click in the button, to open the small window with the new value of the variable...
Somebody knows what I make?

I dont know why I use VOLATILE...
Can you explain???

Short explanation of the volatile keyword.

I am not quite able to reproduce the problem... I am afraid that the only more help I can provide without looking at the problem code is to provide the code I tried to recreate the problem...

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class FirstClass extends JFrame implements ActionListener {
  static String str = "";
  
  public FirstClass() {
    super("Test");
    JPanel panel = (JPanel) this.getContentPane();
    panel.setLayout(new FlowLayout());
    JButton button = new JButton("Press Me!");
    button.addActionListener(this);
    panel.add(button);
    this.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent evt) {
        FirstClass.this.dispose();
        System.exit(0);
      }
    });
    this.pack();
  }
  
  public static void main(String[] args) {
    SecondClass secondClass = new SecondClass();
    FirstClass firstClass = new FirstClass();
    firstClass.setVisible(true);
  }
  
  public void actionPerformed(ActionEvent evt) {
    JDialog dialog = new JDialog(this);
    JPanel panel = (JPanel) dialog.getContentPane();
    
    synchronized(str) {
      JLabel label = new JLabel(str);
      panel.add(label);
    }
    
    dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
    dialog.pack();
    dialog.setVisible(true);
  }
}
class SecondClass {
  SecondClass() {
    Thread t = new Thread() {
      public void run() {
        while (true) {
          synchronized(FirstClass.str) {
            FirstClass.str = "Milliseconds since 1/1/1970 0:00 - " + String.valueOf(
              System.currentTimeMillis());
          }
          
          try {
            Thread.sleep(50);
          } catch (InterruptedException exp) {
            // Ignore.
          }
        }
      }
    };
    t.start();
  }
}

Personal debtor I obtained to decide my problem