private void init_long_press() {
    tbl_cust.addMouseListener(
        new MouseAdapter() {

          Date pressedtime;
          long timeClicked;

          @Override
          public void mousePressed(MouseEvent e) {
            pressedtime = new Date();
          }

          @Override
          public void mouseReleased(MouseEvent e) {
            timeClicked = (new Date()).getTime() - pressedtime.getTime();
            //                JOptionPane.showMessageDialog(null, timeClicked);
            if (timeClicked >= 500) {
              //                     JOptionPane.showMessageDialog(null, timeClicked);
              ok1();
            }
          }
        });
  }