I want to count the number of times the button is clicked using GUI.
I did this code:
private void jButton1ActionPerformed(java.awt.event.ActionEvent
You are resetting the counter every time you click, because you have defined the variable inside the action method. Try not doing that.
int clicked = 0; // move this outside
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt)
{
// int clicked = 0; -- this resets it to 0 each time
clicked++;
System.out.println(clicked);
}