Test Multisplit

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.HeadlessException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.border.EmptyBorder;
import org.jdesktop.swingx.JXMultiSplitPane;
import org.jdesktop.swingx.MultiSplitLayout;

/**
 * Test Multisplit.
 *
 * @author Martin Miller
 * @version 0.1 2012-04-05
 * @see http://www.java.net/comment/reply/884868
 */
public class TestMultiplitSplit extends JFrame {

    private JXMultiSplitPane msp;
    private MultiSplitLayout.Split splitModel;

    public TestMultiplitSplit() throws HeadlessException {
        super("test");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // MultiSplit Layout
        msp = new JXMultiSplitPane();
        splitModel = new LeftRightSplitPaneModel();
        msp.getMultiSplitLayout().setModel(splitModel);
        MultiSplitLayout layout = msp.getMultiSplitLayout();
        msp.setBorder(new EmptyBorder(2, 2, 2, 2));

        setLayout(new BorderLayout());

        msp.add(new JButton("LEFT"), LeftRightSplitPaneModel.LEFT);
        msp.add(new JButton("RIGHT"), LeftRightSplitPaneModel.RIGHT);

        layout.layoutByWeight(msp); // <-- Might be important for good results
        add(msp, BorderLayout.CENTER);

        setSize(new Dimension(800,600));
        setLocationRelativeTo(null);
    }

    /**
     * MultiSplitPane Layout.
     *
     * +--------+---------+
     * |        |         |
     * |   l    |    r    |
     * |        |         |
     * +--------+---------+
     */
    class LeftRightSplitPaneModel extends MultiSplitLayout.Split {

        public static final String LEFT = "l";
        public static final String RIGHT = "r";
        protected MultiSplitLayout.Leaf left = new MultiSplitLayout.Leaf(LEFT);
        protected MultiSplitLayout.Leaf right = new MultiSplitLayout.Leaf(RIGHT);

        public LeftRightSplitPaneModel() {
            super();

            setRowLayout(true);
            left.setWeight(0.3);
            right.setWeight(0.7);
            this.setWeight(1.0);

            setChildren(left, new MultiSplitLayout.Divider(), right);
        }
    }

    public static void main(String[] args) {
        JFrame f = new TestMultiplitSplit();
        f.setVisible(true);
    }
}