无法设置JTextPane/JScrollPane的大小

Question

public void initGUI()
{
    configWindow = new JFrame();
    configWindow.setTitle(node.getDispName()+ " [" + node.getIp() + "] configuration");
    configWindow.setSize(500, 470);
    configWindow.setLocation(TopologyMain.dim.width/2-configWindow.getSize().width/2, TopologyMain.dim.height/2-configWindow.getSize().height/2);
    configWindow.getContentPane().setLayout(new BorderLayout());

    configPane = new JTextPane();
    configPane.setEditable(true);
    configPane.setName("Config");
    configPane.setPreferredSize(new Dimension(500, 450));
    configPane.setBackground(Color.black);
    configPane.setCursor(new Cursor(Cursor.TEXT_CURSOR));

    scrollPane = new JScrollPane(configPane);
    scrollPane.setPreferredSize(new Dimension(500, 450));

    configWindow.getContentPane().add(scrollPane, BorderLayout.NORTH); 

    buttonPanel = new JPanel();
    buttonPanel.setLayout(new GridBagLayout());
    //buttonPanel.setPreferredSize(new Dimension(500, 20));
    GBC.insets = new Insets(5,5,5,5);

    read = new JButton("Read");
    GBC.gridx = 0;
    GBC.gridy = 1;
    GBC.fill = GridBagConstraints.HORIZONTAL;
    buttonPanel.add(read, GBC);

    apply = new JButton("Apply");
    GBC.gridx = 1;
    GBC.gridy = 1;
    GBC.fill = GridBagConstraints.HORIZONTAL;
    buttonPanel.add(apply, GBC);

    load = new JButton("Load");
    GBC.gridx = 2;
    GBC.gridy = 1;
    GBC.fill = GridBagConstraints.HORIZONTAL;
    buttonPanel.add(load, GBC);

    save = new JButton("Save");
    save.setEnabled(false);
    GBC.gridx = 3;
    GBC.gridy = 1;
    GBC.fill = GridBagConstraints.HORIZONTAL;
    buttonPanel.add(save, GBC);

    configWindow.getContentPane().add(buttonPanel, BorderLayout.SOUTH);

    splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, scrollPane, buttonPanel);
    splitPane.setEnabled(true);
    configWindow.getContentPane().add(splitPane, BorderLayout.CENTER);

    configWindow.setVisible(true);

    fileChooser = new JFileChooser();
}

Answer 1

Gabriel Negut在评论中提出的解决方案：

使用pack()-但只能在将所有内容添加到窗口后调用它。

从文档中可以看到：