[英]Exception in thread "main" java.awt.AWTError: Assistive Technology not found
[英]Exception in thread “main” java.awt.AWTError: BoxLayout can't be shared
我在这段代码上收到此错误:
super("Trace Masker");
setLayout(new BoxLayout(getContentPane(), BoxLayout.PAGE_AXIS));
label1 = new JLabel("Source directory:");
label2 = new JLabel("Target directory:");
label3 = new JLabel("Defect number:");
label4 = new JLabel("Slice tokens:");
label4.setToolTipText("Seperate multiple tokens with comma");
txtSourceDirectory = new JTextField(30);
txtTargetDirectory = new JTextField(30);
txtDefectNumber = new JTextField(30);
txtSliceTokens = new JTextField(30);
btnBrowseSourceDirectory = new JButton("...");
btnBrowseTargetDirectory = new JButton("...");
btnStart = new JButton("Start");
btnCancel = new JButton("Cancel");
pnlLabels = new JPanel(new BoxLayout(pnlLabels, BoxLayout.PAGE_AXIS));
pnlText = new JPanel(new BoxLayout(pnlText, BoxLayout.PAGE_AXIS));
pnlBrowseButtons = new JPanel(new BoxLayout(pnlBrowseButtons, BoxLayout.PAGE_AXIS));
pnlTop = new JPanel(new BoxLayout(pnlTop, BoxLayout.LINE_AXIS));
pnlActionButtons = new JPanel(new FlowLayout(FlowLayout.RIGHT));
pnlLabels.add(label1);
pnlLabels.add(label2);
pnlLabels.add(label3);
pnlLabels.add(label4);
pnlText.add(txtSourceDirectory);
pnlText.add(txtTargetDirectory);
pnlText.add(txtDefectNumber);
pnlText.add(txtSliceTokens);
pnlBrowseButtons.add(btnBrowseSourceDirectory);
pnlBrowseButtons.add(btnBrowseTargetDirectory);
pnlTop.add(pnlLabels);
pnlTop.add(pnlText);
pnlTop.add(pnlBrowseButtons);
pnlActionButtons.add(btnStart);
pnlActionButtons.add(btnCancel);
add(pnlTop);
add(pnlActionButtons);
错误在这一行:
pnlLabels.add(label1);
只是为了检查这是否与pnlLabels有关,我评论了它的所有行。 然后错误发生在:
pnlText.add(txtSourceDirectory);
您的问题来自以下行(以及所有其他行看起来相同):
pnlLabels = new JPanel(new BoxLayout(pnlLabels, BoxLayout.PAGE_AXIS));
当调用new BoxLayout(...)
, pnlLabels
仍为null
因为它尚未分配。 正确的方法分为两步:
pnlLabels = new JPanel();
pnlLabels.setLayout(new BoxLayout(pnlLabels, BoxLayout.PAGE_AXIS);
问题应该消失(假设您对所有其他类似的代码行执行此操作)。
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