调用repaint（）时JFrame不更新

Question

我想做一个象棋游戏，我想在游戏循环中的一个jFrame上调用repain（）方法。这个特殊的JFrame显示了每个玩家的总击杀数。我很确定确实调用了repaint（），但由于某种原因，它似乎没有正确更新我的jlabel，jlabel应该保存每个玩家的击杀数值。

这是我为自定义JFrame扩展类编写的代码，该类包含代表kill的JLabel。

private ChessGame game;
private JPanel killsPanel;
private String p1kills;
private String p2kills;
private JLabel kills;
private JLabel p1, p2;
private JLabel p1NumKills = new JLabel();
private JLabel p2NumKills = new JLabel();


//the player's kill values are increasing and registering, just not within the jlabels representing them
public KillsFrame(ChessGame game){
    this.game = game;
    killsPanel = new JPanel(new MigLayout("", "[center][right][left][c]", "[top][center][b]"));
    kills = new JLabel("KILLS");
    p1 = new JLabel(game.getCurrentPlayer().getName() + " - ");
    p2 = new JLabel(game.getOtherPlayer().getName() + " - ");

    //this is the part that should be working but isn't.
    //p1kills and p2kills aren't being updated or something.
    p1kills = "" + game.getCurrentPlayer().getKills();
    p2kills = "" + game.getOtherPlayer().getKills();
    p1NumKills.setText(p1kills);
    p1NumKills.setText(p2kills);

    killsPanel.add(kills, "span");
    killsPanel.add(p1);
    killsPanel.add(p1NumKills, "wrap");
    killsPanel.add(p2);
    killsPanel.add(p2NumKills, "wrap");

    killsPanel.setBackground(Color.lightGray);
    add(killsPanel);
    pack();
    setTitle("Scoreboard");
    setDefaultCloseOperation(DISPOSE_ON_CLOSE);
    setResizable(true);
    setVisible(true);
    setLocationRelativeTo(null);
}

然后我只是在不同类的main方法中调用这个框架的repaint（）：

public static void main(String[] args) throws InterruptedException {

    JFrame gameFrame = new ChessMain();
    gameFrame.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
    gameFrame.pack();
    gameFrame.setResizable(true);
    gameFrame.setLocationRelativeTo(null);
    gameFrame.setVisible(true); 
    gameFrame.setTitle("Chess X");

    LoginFrame loginFrame = new LoginFrame(((ChessMain) gameFrame).getGame());

    System.out.println(((ChessMain) gameFrame).getGame().toString());
    System.out.println(((ChessMain) gameFrame).getGame().currentPlayer.getName()+ ", it's your turn.");

    //this is what creates the kills frame.
    KillsFrame kf = new KillsFrame(((ChessMain) gameFrame).getGame());

    while(true){

        ((ChessMain) gameFrame).getGame().run();
        kf.repaint();//*************************************
        Thread.sleep(1);

    }

}

非常感谢您的任何帮助。

Answer 1

当你试图“Hibernate”你的主线程时，你的错误就出现了。如果不使GUI无响应，这必然会导致错误。你最好用秋千。计时器类（此处为教程http://docs.oracle.com/javase/tutorial/uiswing/misc/timer.html). 定期触发事件以重新绘制（）。这将产生平滑的动画。

如果由于某种原因，您必须在swing程序中Hibernate一个线程，请使用SwingWorker类创建一个新线程（而不是其他）。参见http://docs.oracle.com/javase/7/docs/api/javax/swing/SwingWorker.html#process（java.util.列表）