java - 无法看到 JTextField

Question

按钮 addFinishingInformation 的 GUI 窗口未显示。我为其他按钮编写了相同的方法，它们工作得很好。

我已经调试了一段时间，但无法使字段或任何内容显示出来。任何帮助表示赞赏。谢谢!

JButton addFinishingInformation = new JButton(new AbstractAction("Add Finishing Information") {

    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub

        JFrame addFinishingFrame = new JFrame("Add Finishing Information");
        addFinishingFrame.setSize(700, 500);
        addFinishingFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

        JPanel addFinishingPanel = new JPanel(new BorderLayout());

        JLabel finishingDateFieldLabel = new JLabel("Date:");
        finishingDateFieldLabel.setBounds(10, 40, 160, 25);
        addFinishingPanel.add(finishingDateFieldLabel);

        final JTextField finishingDateField = new JTextField(50);
        finishingDateField.setBounds(140, 40, 160, 25);
        addFinishingPanel.add(finishingDateField);

        Date todaysDateIs_2 = new Date();
        Calendar cal_2 = Calendar.getInstance();
        cal_2.setTime(todaysDateIs_2);
        String formatedTodaysDate_2 = cal_2.get(Calendar.DATE) + "/"
                + (cal_2.get(Calendar.MONTH) + 1) + "/"
                + cal_2.get(Calendar.YEAR);
        finishingDateField.setText(formatedTodaysDate_2);

        JLabel finishingChalanNoLabel = new JLabel("Chalan no. :");
        finishingChalanNoLabel.setBounds(10, 70, 160, 25);
        addFinishingPanel.add(finishingChalanNoLabel);

        final JTextField finishingChalanNumber = new JTextField(50);
        finishingChalanNumber.setBounds(140, 70, 160, 25);
        addFinishingPanel.add(finishingChalanNumber);

        addFinishingFrame.add(addFinishingPanel);
        addFinishingFrame.setLayout(null);

        JButton addFinishingInformationToDatabase = new JButton(
                new AbstractAction("Add finishing information to database") {

                    @Override
                    public void actionPerformed(ActionEvent e) {
                        // TODO Auto-generated method stub
                        Customers customer = new Customers();

                        Date todaysDate_3 = new Date();
                        Calendar cal = Calendar.getInstance();
                        cal.setTime(todaysDate_3);
                        String formatedDate_3 = cal.get(Calendar.DATE)
                                + "/" + (cal.get(Calendar.MONTH) + 1)
                                + "/" + cal.get(Calendar.YEAR);
                        customer.addFinishingInformation(sentToFinishing.getText(),
                                formatedDate_3,
                                finishingChalanNumber.getText(),
                                quantityInWeightFinishing.getText(),
                                lengthInMeterFinishing.getText(),
                                totalShawls.getText());
                    }

                });
        addFinishingInformationToDatabase.setBounds(110, 300, 300, 70);
        addFinishingPanel.add(addFinishingInformationToDatabase);
        addFinishingFrame.setVisible(true);

    }

});

addFinishingInformation.setBounds(460, 360, 250, 70);
mainPanel.add(addFinishingInformation);

Answer 1

    addFinishingFrame.add(addFinishingPanel);
    addFinishingFrame.setLayout(null);

停止使用空布局!!!不要使用 setBounds(...)!!!

Swing 被设计为与布局管理器一起使用。

您看不到任何内容，因为面板的大小为 (0, 0)，因此没有任何内容可绘制。

这就是您使用布局管理器的原因。布局管理器会为您计算尺寸，因此您无需担心。

阅读 Swing 教程中关于 Layout Managers 的部分了解更多信息和工作示例。