java - 将 jpanel 定位在底部

Question

我想将包含发送按钮和文本字段(现在使用流程布局)的 JPanel 放置在 JTextArea(白色区域)的底部。我怎样才能实现这个目标？

public GUI()
{
    mainWindow = new JFrame("Chat GUI");
    lowerPanel = new JPanel(new FlowLayout());
    usersPanel = new JPanel(new GridLayout(GRIDLAYOUT_ROWS, GRIDLAYOUT_COLS));
    users = new JList(data);
    usersPanel.add(users);

    sendButton = new JButton("Send");           
    textField = new JTextField(TEXTFIELD_WIDTH);
    textArea = new JTextArea(TEXTAREA_HEIGHT, TEXTAREA_WIDTH);
    textArea.setEditable(false);
}

private void addButtonListener(JButton b) {
    b.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {

        }
    });
}

public void createGUI() {

    addButtonListener(sendButton);

    lowerPanel.add(sendButton);
    lowerPanel.add(textField);

    mainWindow.add(users);
    mainWindow.add(textArea);
    mainWindow.add(lowerPanel);

    mainWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    mainWindow.setVisible(true);
    mainWindow.setLayout(new FlowLayout());
    mainWindow.pack();
}

Answer 1

您将拥有布局:

this.add(buttonPanel,BorderLayout.SOUTH);

参见this answer