Java 游戏 - ClassCastException

Question

我正在开发一个简单的 Java 游戏，但我的滚动条出现异常。 滚动条应该是一个“gameslider”。

Exception in thread "Thread-3" java.lang.ClassCastException: sun.java2d.NullSurfaceData cannot be cast to sun.java2d.d3d.D3DSurfaceData at sun.java2d.d3d.D3DRenderer.copyArea(Unknown Source) at sun.java2d.d3d.D3DSurfaceData.copyArea(Unknown Source) at sun.java2d.SunGraphics2D.doCopyArea(Unknown Source) at sun.java2d.SunGraphics2D.copyArea(Unknown Source) at javax.swing.BufferStrategyPaintManager.copyArea(Unknown Source) at javax.swing.RepaintManager.copyArea(Unknown Source) at javax.swing.JViewport.blitDoubleBuffered(Unknown Source) at javax.swing.JViewport.windowBlitPaint(Unknown Source) at javax.swing.JViewport.setViewPosition(Unknown Source) at javax.swing.plaf.basic.BasicScrollPaneUI$Handler.hsbStateChanged(Unknown Source) at javax.swing.plaf.basic.BasicScrollPaneUI$Handler.stateChanged(Unknown Source) at javax.swing.DefaultBoundedRangeModel.fireStateChanged(Unknown Source) at javax.swing.DefaultBoundedRangeModel.setRangeProperties(Unknown Source) at javax.swing.DefaultBoundedRangeModel.setValue(Unknown Source) at javax.swing.JScrollBar.setValue(Unknown Source) at GameEnvironment.GamePanel.gameUpdate(GamePanel.java:171) at GameEnvironment.GamePanel.run(GamePanel.java:73) at java.lang.Thread.run(Unknown Source)

代码行如下:

        if (reachedMiddle)
        scrollPane.getHorizontalScrollBar().setValue(player.getX() - (widthHorizontalScrollBar / 2));

异常将或多或少地随机引发。到目前为止我还没弄明白。

Answer 1

我会确保此代码在 GUI 事件线程上运行。如果您在其他线程上调用 Swing 组件，您可能会遇到奇怪的随机错误。

看看使用 SwingUtilities.invokeLater(Runnable)执行更新 Swing 组件的任务。