Java tutorial
import java.awt.FlowLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class Main { public static void main(String[] a) { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JPanel buttonPanel = new JPanel(new FlowLayout(), true); buttonPanel.add(new JButton("A")); frame.add(buttonPanel); frame.setSize(300, 200); frame.setVisible(true); } }