Java tutorial
import javax.swing.Box; import javax.swing.BoxLayout; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JLabel; public class Main extends JFrame { public Main() { Box box = new Box(BoxLayout.Y_AXIS); add(box); JLabel label = new JLabel("I'm centered"); label.setAlignmentX(JComponent.CENTER_ALIGNMENT); box.add(Box.createVerticalGlue()); box.add(label); box.add(Box.createVerticalGlue()); } public static void main(String[] args) { Main frame = new Main(); frame.setDefaultCloseOperation(EXIT_ON_CLOSE); frame.setSize(300, 300); frame.setLocationRelativeTo(null); frame.setVisible(true); } }