SplitPane: VerticalSplit
import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JSplitPane; public class VerticalSplit { public static void main(String args[]) { JFrame vFrame = new JFrame("Vertical Split"); vFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JComponent leftButton = new JButton("Left"); JComponent rightButton = new JButton("Right"); final JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT); splitPane.setOneTouchExpandable(true); splitPane.setLeftComponent(leftButton); splitPane.setRightComponent(rightButton); ActionListener oneActionListener = new ActionListener() { public void actionPerformed(ActionEvent event) { splitPane.resetToPreferredSizes(); } }; ((JButton) rightButton).addActionListener(oneActionListener); ActionListener anotherActionListener = new ActionListener() { public void actionPerformed(ActionEvent event) { splitPane.setDividerLocation(10); splitPane.setContinuousLayout(true); } }; ((JButton) leftButton).addActionListener(anotherActionListener); vFrame.getContentPane().add(splitPane, BorderLayout.CENTER); vFrame.setSize(300, 150); vFrame.setVisible(true); } }