private void CheckOutAction() {
   String confirmMsg =
       member.getFirstName()
           + ":\nYou will checkout the book "
           + pub.getTitle()
           + ".\nPlease confirm!";
   int confirm =
       MessageBox.show(
           checkoutStage,
           confirmMsg,
           "Question dialog",
           MessageBox.ICON_QUESTION | MessageBox.YES | MessageBox.NO | MessageBox.DEFAULT_BUTTON2);
   // proceed if confirmed
   if (confirm == MessageBox.YES) {
     setLibraryMember(memberID.getText());
     if (saveCheckOutRecord()) {
       MessageBox.show(
           checkoutStage,
           "Check out successfully!",
           "Success Infomation",
           MessageBox.ICON_INFORMATION | MessageBox.OK | MessageBox.DEFAULT_BUTTON2);
     }
   }
 }