Java tutorial
import java.awt.BorderLayout; import java.awt.Component; import javax.swing.Box; import javax.swing.BoxLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class Main { public static void main(String[] argv) { JFrame f = new JFrame(); f.setLayout(new BorderLayout()); JPanel panel = new JPanel(); JButton button = new JButton("A-ha!"); button.setAlignmentX(Component.CENTER_ALIGNMENT); panel.setLayout(new BoxLayout(panel, BoxLayout.PAGE_AXIS)); panel.add(Box.createVerticalGlue()); panel.add(button); panel.add(Box.createVerticalGlue()); f.getContentPane().add(panel); f.setVisible(true); } }