如何从RepaintManager生成exception

结合我的问题 （ 可能 ），我发现了另一种exceptiontypes，我无法从SwingWorker线程捕获和打印出来。

我怎样才能生成RepaintManagerexception？

我读了这个CheckThreadViolationRepaintManager和Alexander Potochkin 这个方法 ，但似乎没有解决我的问题。

Answer 1

如果有帮助，下面的示例将引发以下Exception多个变体，主要针对框架的UI委托初始化的每个阶段。 我使用了CheckThreadViolationRepaintManager ，但AspectJ 变体看起来也很有趣。

 java.lang.Exception的
    在EDTViolation $ CheckThreadViolationRepaintManager.checkThreadViolations（EDTViolation.java:43）
    在EDTViolation $ CheckThreadViolationRepaintManager.addDirtyRegion（EDTViolation.java:37）
    在javax.swing.JComponent.repaint（JComponent.java:4734）
    在java.awt.Component.repaint（Component.java:3168）
    在javax.swing.JComponent.setFont（JComponent.java:2727）
    在javax.swing.LookAndFeel.installColorsAndFont（LookAndFeel.java:191）
    在javax.swing.plaf.basic.BasicPanelUI.installDefaults（BasicPanelUI.java:49）
    在javax.swing.plaf.basic.BasicPanelUI.installUI（BasicPanelUI.java:39）
    在javax.swing.JComponent.setUI（JComponent.java:662）
    在javax.swing.JPanel.setUI（JPanel.java:136）
    在javax.swing.JPanel.updateUI（JPanel.java:109）
    在javax.swing.JPanel。（JPanel.java:69）
    在javax.swing.JPanel。（JPanel.java:92）
    在javax.swing.JPanel。（JPanel.java:100）
    在javax.swing.JRootPane.createGlassPane（JRootPane.java:528）
    在javax.swing.JRootPane。（JRootPane.java:348）
    在javax.swing.JFrame.createRootPane（JFrame.java:255）
    在javax.swing.JFrame.frameInit（JFrame.java:236）
    在javax.swing.JFrame。（JFrame.java:159）
    在EDTViolation.main（EDTViolation.java:12）
 ...

 import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.RepaintManager; import javax.swing.SwingUtilities; /** @see https://stackoverflow.com/questions/7787998 */ public class EDTViolation { public static void main(String args[]) { RepaintManager.setCurrentManager(new CheckThreadViolationRepaintManager()); JFrame f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.pack(); f.setVisible(true); } private static class CheckThreadViolationRepaintManager extends RepaintManager { //http://weblogs.java.net/blog/alexfromsun/archive/2006/02/debugging_swing.html private boolean completeCheck = true; private WeakReference<JComponent> lastComponent; public CheckThreadViolationRepaintManager(boolean completeCheck) { this.completeCheck = completeCheck; } public CheckThreadViolationRepaintManager() { this(true); } public boolean isCompleteCheck() { return completeCheck; } public void setCompleteCheck(boolean completeCheck) { this.completeCheck = completeCheck; } @Override public synchronized void addInvalidComponent(JComponent component) { checkThreadViolations(component); super.addInvalidComponent(component); } @Override public void addDirtyRegion(JComponent component, int x, int y, int w, int h) { checkThreadViolations(component); super.addDirtyRegion(component, x, y, w, h); } private void checkThreadViolations(JComponent c) { if (!SwingUtilities.isEventDispatchThread() && (completeCheck || c.isShowing())) { boolean repaint = false; boolean fromSwing = false; boolean imageUpdate = false; StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace(); for (StackTraceElement st : stackTrace) { if (repaint && st.getClassName().startsWith("javax.swing.") && // for details see // https://swinghelper.dev.java.net/issues/show_bug.cgi?id=1 !st.getClassName().startsWith("javax.swing.SwingWorker")) { fromSwing = true; } if (repaint && "imageUpdate".equals(st.getMethodName())) { imageUpdate = true; } if ("repaint".equals(st.getMethodName())) { repaint = true; fromSwing = false; } if ("read".equals(st.getMethodName()) && "javax.swing.JEditorPane".equals(st.getClassName())) { // Swing reads html from a background thread return; } } if (imageUpdate) { //assuming it is java.awt.image.ImageObserver.imageUpdate(...) //image was asynchronously updated, that's ok return; } if (repaint && !fromSwing) { //no problems here, since repaint() is thread safe return; } //ignore the last processed component if (lastComponent != null && c == lastComponent.get()) { return; } lastComponent = new WeakReference<JComponent>(c); violationFound(c, stackTrace); } } protected void violationFound(JComponent c, StackTraceElement[] stackTrace) { System.out.println(); System.out.println("EDT violation detected"); System.out.println(c); for (StackTraceElement st : stackTrace) { System.out.println("\tat " + st); } } } } 

Answer 2

创build你自己的例外

 class RepaintManagerException extends Exception { String msg; RepaintManagerException() { msg = new String("type message here"); } } 

用法

 public class My_Exception { public static void main (String args [ ]) { try { // your code if (expression) throw new RepaintManagerException( ); } catch (RepaintManagerException e) { System.out.println (e); } } }