private void jButton7ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton7ActionPerformed
    isAlt = !isAlt;
    if( isAlt==true ){
        pressSystemKey(KeyEvent.VK_ALT);
        jButton7.setBackground(Color.black);
        jButton7.setForeground(Color.white);
    }
    else{
        releaseSystemKey(KeyEvent.VK_ALT);
        jButton7.setBackground(Color.white);
        jButton7.setForeground(Color.black);
    }
}//GEN-LAST:event_jButton7ActionPerformed