Question

My question is straight.
I have made a simple app in neatbeans in which when I click a button the x coordinates of the text say a ‘@’ keeps changing by 20.
heres the code:-

int x;

private void wActionPerformed(java.awt.event.ActionEvent evt) 
{                                  
    x=x+20;       
    q.setLocation(x, 0);    
}

this code simply moves the jlabel ( q ) to the right by 20 coordinates each time i click the jbutton ( w ).
now what i want is that when i click the button only ONCE then the position of the JLabel should keep increasing its x coordinate by 20 untill it has reached a specific x coordinate say 200.
i tried using for loops :-

private void wActionPerformed(java.awt.event.ActionEvent evt)
{
    for(x=0;x<201;x=x+20)
    {
        q.setlocation(x,0);
    }  
}

but with this when I click the button, the jlabel directly moves to 200 x coordinate without stopping after every 20 coordinates…please help..
Regards,
Slinger

Answer 1

The problem with the above is that Swing is calling your incrementer and only performing a refresh once your incrementing function has completed. Instead you need to start up a separate thread to perform this animation and let Swing update after each increment.

Check out SwingUtilities.invokeLater() and the SwingWorker class. Here’s a tutorial on SwingWorker.