[求助]JColorChooser为什么加不上去？？

[hooligan000112003]

我有一个改前景的菜单，单击后改变TextArea里文字的颜色，但错误，不知为什么？

菜单事件如下：
void foregroundMenuItem_actionPerformed(ActionEvent e) {
Color color = JColorChooser.showDialog(this,"Foreground",TextArea.getBackground());
if(color != null){
TextArea.setBackground(color);
}
this.repaint();
}

错误如下：

java.lang.IllegalArgumentException: Invalid mnemonic index: 3

at javax.swing.JTabbedPane$Page.setDisplayedMnemonicIndex(JTabbedPane.java:1805)

at javax.swing.JTabbedPane.setDisplayedMnemonicIndexAt(JTabbedPane.java:1385)

at javax.swing.plaf.basic.BasicColorChooserUI$PropertyHandler.propertyChange(BasicColorChooserUI.java:234)

at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:264)

at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:232)

at javax.swing.JComponent.firePropertyChange(JComponent.java:3814)

at javax.swing.JColorChooser.setChooserPanels(JColorChooser.java:446)

at javax.swing.plaf.basic.BasicColorChooserUI.installUI(BasicColorChooserUI.java:79)

at javax.swing.JComponent.setUI(JComponent.java:449)

at javax.swing.JColorChooser.setUI(JColorChooser.java:209)

at javax.swing.JColorChooser.updateUI(JColorChooser.java:220)

at javax.swing.JColorChooser.<init>(JColorChooser.java:183)

at javax.swing.JColorChooser.<init>(JColorChooser.java:171)

at javax.swing.JColorChooser.<init>(JColorChooser.java:162)

at book.book.<init>(book.java:48)

at book.Application1.<init>(Application1.java:12)

at book.Application1.main(Application1.java:45)

Exception in thread "main"

[hooligan000112003]

我是用JBUILDER9做的，可以运行，就是单击菜单时产生异常，是不是要初始化？
谢谢

[hooligan000112003]

谁能帮我一下，谢谢

[jacklondon]

background, foregroud?
去掉 this.repaint(), 没有必要.
TextArea 是变量么？Java 中有个 class 叫 TextArea .建议换别的名字，Java 变量名一般第一字母小写。

[jacklondon]

不知道。你把代码贴上来吧。

[cloves]

看你的错误好像是
TextArea.getBackground()，出了问题，你还是把所有的TextArea这个变量换个名吧