HelpFrame.javaimport javax.swing.*; import java.awt.*;public class HelpFrame extends JFrame { public HelpFrame() { super("RHS Hilfesystem"); setSize(300, 600); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); MainButtons mb = new MainButtons(); getContentPane().setLayout(new java.awt.BorderLayout()); getContentPane().add(mb, BorderLayout.NORTH); setVisible(true); } } ----------------------------------------------Mainbuttons.javaimport javax.swing.*; public class MainButtons extends JPanel { JButton vor = new JButton ("Vor"); JButton zurueck = new JButton ("Zurueck"); JButton inhalt = new JButton ("Inhalt"); JButton index = new JButton ("Index"); JButton drucken = new JButton ("Drucken"); public MainButtons() { JPanel buttonbox = new JPanel(); buttonbox.add(vor); buttonbox.add(zurueck); buttonbox.add(inhalt); buttonbox.add(index); buttonbox.add(drucken); } }