java - 在Java中指定JLabels高度之间一定的间距

Question

我尝试过寻找这个答案，并尝试了我在此处的帖子中找到的一些内容，但似乎没有任何效果。

我拥有的是这样的:

这样:

private class InputGUI extends JFrame implements ActionListener
{

    private JTextField urlIn = new JTextField(colWidth);
    private JLabel urlLabel = new JLabel("DB URL: ");

    private JTextField protocolIn = new JTextField(colWidth);
    private JLabel protocolLabel = new JLabel("Protocol: ");

    private JTextField portIn = new JTextField(colWidth);
    private JLabel portLabel = new JLabel("Port: ");

    private JTextField userIn = new JTextField(colWidth);
    private JLabel userLabel = new JLabel("Username: ");

    private JPasswordField passIn = new JPasswordField(colWidth);
    private JLabel passLabel = new JLabel("Password: ");

    private JTextField tableIn = new JTextField(colWidth);
    private JLabel tableLabel = new JLabel("Table: ");


    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    public void inputFields()
    {
        addWindowListener(new WindowAdapter()
        {
            public void windowClosing(WindowEvent e)
            {
                inputExit.doClick();
            }
        });

        // Sets the size, what to do when closed and the title
        this.setSize(350,400);
        this.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
        this.setTitle("Brewberry Pi!");

        // Set the location off the frame
        this.setLocationRelativeTo(null);

        button1 = new JButton("Submit");
        button1.addActionListener(this);

        button2 = new JButton("Cancel");
        button2.addActionListener(this);

        inputExit = new JButton("Exit");
        inputExit.addActionListener(this);

        // Panel for content to be added to
        JPanel labelPanel = new JPanel();
        JPanel fieldPanel = new JPanel();
        JPanel buttonPanel = new JPanel();

        Box box1 = Box.createVerticalBox();
        Box box2 = Box.createVerticalBox();

        box1.add(urlLabel);
        box1.add(protocolLabel);
        box1.add(portLabel);
        box1.add(userLabel);
        box1.add(passLabel);
        box1.add(tableLabel);

        box2.add(urlIn);
        box2.add(protocolIn);
        box2.add(portIn);
        box2.add(userIn);
        box2.add(passIn);
        box2.add(tableIn);

        labelPanel.add(box1);
        fieldPanel.add(box2);
        buttonPanel.add(button1);
        buttonPanel.add(button2);   

        // Add Panel to frame
        this.add(labelPanel, BorderLayout.WEST);
        this.add(fieldPanel, BorderLayout.CENTER);
        this.add(buttonPanel, BorderLayout.SOUTH);

        this.pack();

        // Don't allow the user to change the size of our window
        this.setResizable(false);

        // Set to visible
        this.setVisible(true);
    }

我需要标签与字段对齐，但无论我尝试什么，标签总是在彼此的正下方。

Answer 1

试试这个:

box1.add(urlLabel);
box1.add(Box.createRigidArea(new Dimension(5,5))); // change these dimension to achieve the correct spacing
box1.add(protocolLabel);
box1.add(Box.createRigidArea(new Dimension(5,5))); 
box1.add(portLabel);
box1.add(Box.createRigidArea(new Dimension(5,5))); 
box1.add(userLabel);
box1.add(Box.createRigidArea(new Dimension(5,5))); 
box1.add(passLabel);
box1.add(Box.createRigidArea(new Dimension(5,5))); 
box1.add(tableLabel);

另请参阅: How to Use BoxLayout: Using Invisible Components as Filler .