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Use the split pane

import java.awt.BorderLayout; import java.awt.Color; import java.awt.Component; import java.awt.Dimension; import java.awt.Graphics; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JSplitPane; public class SplitSample extends JFrame {   protected JSplitPane split;   public SplitSample() {     super("Simple Split Pane");     setSize(400, 400);     getContentPane().setLayout(new BorderLayout());     JSplitPane spLeft = new JSplitPane(JSplitPane.VERTICAL_SPLIT, new JPanel(), new JPanel());     spLeft.setDividerSize(8);     spLeft.setContinuousLayout(true);     JSplitPane spRight = new JSplitPane(JSplitPane.VERTICAL_SPLIT, new JPanel(), new JPanel());     spRight.setDividerSize(8);     spRight.setContinuousLayout(true);     split = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, spLeft, spRight);     split.setContinuousLayout(false);     split.setOneTouchExpandable(true);     getContentPane().add(split, BorderLayout.CENTER);     WindowListener wndCloser = new WindowAdapter() {       public void windowClosing(WindowEvent e) {         System.exit(0);       }     };     addWindowListener(wndCloser);     setVisible(true);   }   public static void main(String argv[]) {     new SplitSample();   } }