package info.istlab.ServerTester; import javax.swing.BoxLayout; import javax.swing.JFrame; import javax.swing.JPanel; public class Host extends JFrame { public JPanel mainPanel; public Host() { setTitle("Host"); setSize(300, 200); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true); mainPanel = new JPanel(); mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS)); add(mainPanel); } public void addPanel(JPanel panel) { mainPanel.add(panel); pack(); } public static void main(String[] args) { new Host(); } }