How to Center a JLabel Horizontally within a JPanel?

Centering a JLabel within a JPanel

When using a GUI builder to manage layout, it can be challenging to precisely align UI elements. This article provides detailed instructions on centering a JLabel horizontally within its parent JPanel, regardless of JPanel size changes.

Methods for Centering

There are several methods for centering a JLabel within a JPanel:

Border Layout:

JLabel label = new JLabel("Centered");
JPanel panel = new JPanel(new BorderLayout());
panel.add(label, BorderLayout.CENTER);

GridBagLayout:

JLabel label = new JLabel("Centered");
JPanel panel = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 1;
gbc.gridy = 1;
gbc.weightx = 1;
gbc.weighty = 1;
gbc.fill = GridBagConstraints.BOTH;
panel.add(label, gbc);

GridLayout with Center Alignment:

JLabel label = new JLabel("Centered", SwingConstants.CENTER);
JPanel panel = new JPanel(new GridLayout());
panel.add(label);

BoxLayout (via @0verbose):

JPanel panel = new JPanel();
panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS));
panel.add(Box.createHorizontalGlue());
panel.add(new JLabel("Centered"));
panel.add(Box.createHorizontalGlue());

These methods all align the JLabel horizontally within the JPanel, allowing it to remain centered even as the panel is resized.

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