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copied!<p>I used <a href="http://download.oracle.com/javase/7/docs/api/javax/swing/JSplitPane.html#setResizeWeight%28double%29"><code>setResizeWeigth</code></a> to tell the <code>JSplitPanes</code> how to distribute size. As a bonus, the split panes keep the even distribution even when you resize the window. They will lose the even distribution once you resize one of the panes.</p> <p>Note that you do not necessarily need the <code>AncestorListener</code> anymore. I used it just to print out the sizes of the <code>JScrollPanes</code>.</p> <pre><code>import java.awt.BorderLayout; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JSplitPane; import javax.swing.JTable; import javax.swing.event.AncestorEvent; import javax.swing.event.AncestorListener; public class TestSplitPanels extends JPanel { public static void main(String[] args) { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); final TestSplitPanels tps = new TestSplitPanels(); frame.setContentPane(tps); frame.pack(); frame.setVisible(true); } public TestSplitPanels() { JTable jt1 = new JTable(); JTable jt2 = new JTable(); JTable jt3 = new JTable(); final JScrollPane jsr1 = new JScrollPane(); final JScrollPane jsr2 = new JScrollPane(); final JScrollPane jsr3 = new JScrollPane(); jsr1.setViewportView(jt1); jsr2.setViewportView(jt2); jsr3.setViewportView(jt3); JSplitPane jsl1 = new JSplitPane(); JSplitPane jsl2 = new JSplitPane(); jsl1.setOrientation(JSplitPane.VERTICAL_SPLIT); jsl1.setTopComponent(jsr1); jsl1.setBottomComponent(jsl2); jsl1.setResizeWeight(0.33); // <-- here jsl2.setOrientation(JSplitPane.VERTICAL_SPLIT); jsl2.setTopComponent(jsr2); jsl2.setBottomComponent(jsr3); jsl2.setResizeWeight(0.5); // <-- here this.addAncestorListener(new BaseAncestorListener() { @Override public void ancestorMoved(AncestorEvent event) { System.out.println("jsr1 size: " + jsr1.getSize()); System.out.println("jsr2 size: " + jsr2.getSize()); System.out.println("jsr3 size: " + jsr3.getSize()); System.out.println("----"); } }); setLayout(new BorderLayout()); add(jsl1, BorderLayout.CENTER); } public static class BaseAncestorListener implements AncestorListener { @Override public void ancestorAdded(AncestorEvent event) { } @Override public void ancestorRemoved(AncestorEvent event) { } @Override public void ancestorMoved(AncestorEvent event) { } } } </code></pre>

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