Java tutorial
import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.event.ComponentAdapter; import java.awt.event.ComponentEvent; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTabbedPane; public class Main { public static void main(String[] args) { JPanel panel = new JPanel() { @Override public Dimension getPreferredSize() { return new Dimension(200, 200); } }; panel.addComponentListener(new ComponentAdapter() { @Override public void componentResized(ComponentEvent e) { System.out.println("Resized to " + e.getComponent().getSize()); } @Override public void componentMoved(ComponentEvent e) { System.out.println("Moved to " + e.getComponent().getLocation()); } }); JTabbedPane tabbedPane = new JTabbedPane(); tabbedPane.addTab("test", panel); JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.add(tabbedPane); frame.pack(); frame.setVisible(true); } }