java - 如何解决 Swing JPanel 中显示倒数计时器(JLabel)的延迟问题

Question

我已经实现了一个倒计时器(在函数中)，它每秒更新 Swing 面板中的标签，这是代码:

public void DefineTimer()
    {
    Action updateClockAction = new AbstractAction() {
                    public void actionPerformed(ActionEvent e){

                         JPanelMainGame.this.jLabelSeconds.setText(Integer.toString(JPanelMainGame.this.m_TimerTotalSeconds));
                         JPanelMainGame.this.jLabelSeconds.setFont(new java.awt.Font("Lucida Handwriting", 1, 36));
                         JPanelMainGame.this.jLabelSeconds.setForeground(Color.red);
                         JPanelMainGame.this.jLabelSeconds.setVisible(true);



                        if( JPanelMainGame.this.m_TimerTotalSeconds >0)
                        {
                             JPanelMainGame.this.m_TimerTotalSeconds--;
                        }
                        else if ( JPanelMainGame.this.m_TimerTotalSeconds == 0)
                        {

                            JPanelMainGame.this.m_Timer.stop();
                            JPanelMainGame.this.jLabelSeconds.setText("0");
                            System.out.println("!m_WasGameDecisived: "+!m_WasGameDecisived);

                            JPanelGameApplet gameApplet = (JPanelGameApplet) getTopLevelAncestor();
                            //Checking whether time ended for both players and no solution was recieved

                            if(gameApplet.GetJPanelChooseGame().GetGameType() == eGameType.Net)
                            {


                                gameApplet.GetClinetThread().UpdateServerOfTimeEnded();

                                if (!m_WasGameDecisived)
                                {
                                    // 
                                    System.out.println("Tie - No one had a solution in the given time");

                                    System.out.println("Before send request to solve - Is Socket Closed:"+((JPanelGameApplet) 
                                    gameApplet.GetClinetThread().SendRequestToClosePlayerThreadAndRemoveItFromPlayersOnServer();

                                    ((JPanelGameApplet)getTopLevelAncestor()).GetDJ().stop();
                                    Menu.BrowseTo(PanelMenuNumber.k_ChooseGame, JPanelMainGame.this.getParent());
                                    ((JPanelGameApplet)getTopLevelAncestor()).GetDJ().play(0);

                                }
                            }
                            else if(gameApplet.GetJPanelChooseGame().GetGameType() == eGameType.Single)
                            {
                                JPanelMainGame.this.showPopUpSelectionBar();

                            }

                        }

                       ((JPanelGameApplet)getTopLevelAncestor()).GetNetMainGame().Initialize();

                    }
                };
                m_Timer = new Timer(1000, updateClockAction);
        }  

现在，当我想要执行以下操作时，我的问题出在代码的另一部分:

case ProtocolMessages.k_StartGame:
                       m_GameApplet.GetJpanelStartNetGame().DefineTimer();
                       m_GameApplet.GetJpanelStartNetGame().GetTimer().start();
                       m_GameApplet.ShowBoardToSolve();
                       Menu.BrowseTo(PanelMenuNumber.k_NetPlayersGameStart,m_GameApplet.GetJPanelNetGameSetting().getParent());
                       m_GameApplet.GetDJ().Next();
                       break;  

所以问题是当我想开始游戏时，我正在定义我的计时器并分配它， 给它启动命令并转到屏幕，我应该在那里看到计时器(JLabel 更新)。
尽管它应该已经在计数了(甚至在显示计时器的屏幕之前)，但我仍然有延迟:我看到显示计时器的面板，大约两秒后，Jlabel 出现并开始倒计时。
我认为这是因为在我执行 Jlabel.setText() 时，事件调度线程没有立即更新 Jlabel

关于如何在不延迟显示 Jlabel 的情况下开始游戏有什么建议吗？
谢谢

Answer 1

从线程中调用 SwingUtilities.invokeAndWait 以设置标签文本。