[JAVA2D] SplitPane

[qinghuai gao]

I tried to put 2 split panes into a split pane. The divider in the
continer works well. But the dividers in the sub-panes doesn't move.
Please see the attached code. Any helps will be appreciated.

Qinghuai
import javax.swing.JFrame;
import javax.swing.JSplitPane;

public class test1 extends JFrame {
    public static void main(String[] args) {
        JFrame f = new test1();

        f.show();
    }

    public test1() {
        setBounds(100, 200, 400, 500);

        JSplitPane p1 = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
        p1.setDividerLocation(100);
        p1.setContinuousLayout(true);

        JSplitPane p2 = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
        p2.setDividerLocation(150);
        p2.setContinuousLayout(true);

        JSplitPane p3 = new JSplitPane(JSplitPane.VERTICAL_SPLIT,
                                     p1, p2);
        p3.setContinuousLayout(true);

        this.getContentPane().add(p3);
    }
}