private void stopButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_stopButtonActionPerformed
        if (task == null || !task.isAlive()) {
            return;
        }
        task.interrupt();
        setEnableControls(true);
        setRunningIndicator(false);
        sout.println("\n\nSTOPPED.");
    }//GEN-LAST:event_stopButtonActionPerformed