java - java/swing:JSlider.setValue被阻止

我对JSlider.setValue的调用有时会阻塞线程，从而导致整个应用程序死锁。

这是阻塞线程的堆栈跟踪。

Thread [RenderThread] (Suspended)
JSlider(Component).getMousePosition() line: not available [local variables unavailable]
SynthSliderUI.calculateThumbLocation() line: not available [local variables unavailable]
BasicSliderUI$Handler.stateChanged(ChangeEvent) line: not available
DefaultBoundedRangeModel.fireStateChanged() line: not available [local variables unavailable]
DefaultBoundedRangeModel.setRangeProperties(int, int, int, int, boolean) line: not available
DefaultBoundedRangeModel.setValue(int) line: not available
JSlider.setValue(int) line: not available
TimeLine.setTime(double) line: 422
GLFrame.display() line: 302
GLFrame$2.renderCallback() line: 188
LWJGLBinding$1.paintGL() line: 49
LWJGLBinding$1(AWTGLCanvas).paint(Graphics) line: 314
LWJGLBinding$1(AWTGLCanvas).update(Graphics) line: 343
GLFrame$2(LWJGLBinding).startRendering() line: 78
GLFrame$3.run() line: 267

这似乎与灵气外观有关，因为我没有使用默认外观。

    try
    {
        UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }

编辑：
与invokeLater我确实收到此异常：

at javax.swing.plaf.synth.SynthTreeUI.paint(Unknown Source)
at javax.swing.plaf.synth.SynthTreeUI.update(Unknown Source)
at javax.swing.JComponent.paintComponent(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.paintToOffscreen(Unknown Source)
at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(Unknown Source)
at javax.swing.RepaintManager$PaintManager.paint(Unknown Source)
at javax.swing.RepaintManager.paint(Unknown Source)
at javax.swing.JComponent._paintImmediately(Unknown Source)
at javax.swing.JComponent.paintImmediately(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.seqPaintDirtyRegions(Unknown Source)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

最佳答案

摆动组件不是线程安全的。在已经显示的Swing组件上进行任何修改的操作，都必须在所谓的事件调度线程（EDT）中执行。为此，Swing授予您以下功能：

其中两个用于代码执行：

SwingUtilities.invokeLater(Runnable)
SwingUtilities.invokeAndWait(Runnable)

他们的目的来自他们的名字。第三是

SwingUtilities.isEventDispatchThread()

如果返回true，则说明您已经在EDT中并且可以直接执行代码。

请注意，如果invokeAndWait会直接从EDT中调用，则会引发异常（invokeLater不会，但仍不建议这样做），因此可以从EDT和侧线程调用该代码，应编写如下：

if (SwingUtilities.isEventDispatchThread()) {
    // code
} else {
    SwingUtilities.invokeLater(new Runnable () {
        public void run () {
            // code
        }
    });
}

为了简单和易读，您可以将内部代码提取到方法中。

关于java - java/swing:JSlider.setValue被阻止，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/5754555/