Swing Layouts in Action

Pluggable Layouts

Swing reuses the AWT layout managers (FlowLayout, BorderLayout, GridBagLayout) plus a few extensions. Here are common patterns with visual results.

Form With GridBagLayout

JPanel form = new JPanel(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.insets = new Insets(4, 4, 4, 4);
c.anchor = GridBagConstraints.WEST;

c.gridx = 0; c.gridy = 0;
form.add(new JLabel("Name:"), c);
c.gridx = 1;
form.add(new JTextField(12), c);

c.gridx = 0; c.gridy = 1;
form.add(new JLabel("Email:"), c);
c.gridx = 1;
form.add(new JTextField(12), c);

Resizing Behaviour

Layouts respond to window resizes automatically - regions stretch by weight.

Nested Panels

The classic technique: nest JPanels with different layouts to build almost any arrangement.

Key Points

• GridBagLayout + insets build aligned forms in one panel.
• Nesting panels is the simplest way to combine layouts.
• Test layouts by resizing the window.