java - GUI not updating after a remove, revalidate, and repaint -


in program i'm creating, i'm showing local queue on gui, , letting user have option click button remove top element of queue, removing queue , panel. when try remove panel , "refresh" panel, works once.

screenshot of panel: screenshot of panel

example of situation:

1) queue of 5 elements created , shown on panel

2) user clicks button remove top of queue

  • top of queue deleted , removed screen

3) user clicks button remove top of queue again

  • top of queue deleted not remove screen

(side note: adds resolvedtickets_ panel once well)

here code snippet; can provide more if need be:

public void actionperformed(actionevent evt) {     if("removefromqueue".equals(evt.getactioncommand())){          system.out.println("removefromqueue button clicked");          if(empty()){             joptionpane.showmessagedialog(null, "queue empty! work.");             return;         }          // removes top of queue screen         mainframe.activequeue_.remove(queue.get(0));          // updates ui         mainframe.activequeue_.revalidate();         mainframe.activequeue_.repaint();          resolved.add(queue.get(0)); // adds resolved tickets          mainframe.resolvedtickets_.add(resolved.get(resolved_count));         resolved_count++;          deletefirst(); // deletes queue     } }

the deletefirst() method:

public void deletefirst() {     if (empty()) {         return;     }      if (front.equals(null)) {         rear = null;     }      front = front.getnext();     count--; }

thank , / or advice in advance.


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