private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton6ActionPerformed
    isShift = !isShift;
    if( isShift==true )
        shiftOn();
    else
        shiftOff();
    //jButton6.setEnabled(false);
    //System.out.println("***");
}//GEN-LAST:event_jButton6ActionPerformed