Java tutorial
import java.awt.Component; import java.awt.Dimension; import javax.swing.Box; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.border.EmptyBorder; public class Main extends JFrame { public Main() { Box box = Box.createHorizontalBox(); box.setBorder(new EmptyBorder(5, 5, 5, 5)); Dimension size = new Dimension(100, 25); box.add(createButton("Button1", size)); box.add(createStrut()); box.add(createButton("Button2", size)); box.add(createStrut()); box.add(createButton("Button3", size)); box.add(createStrut()); box.add(createButton("Button4", size)); add(box); } private JButton createButton(String text, Dimension size) { JButton button = new JButton(text); button.setPreferredSize(size); button.setMinimumSize(size); button.setMaximumSize(size); return button; } private Component createStrut() { JComponent component = (JComponent) Box.createHorizontalStrut(5); component.setMinimumSize(new Dimension(0, 0)); component.setMaximumSize(new Dimension(Short.MAX_VALUE, Short.MAX_VALUE)); return component; } public static void main(String[] args) { Main frame = new Main(); frame.setDefaultCloseOperation(EXIT_ON_CLOSE); frame.pack(); frame.setVisible(true); } }