Get the Children in a JSplitPane in Java

 /*from  ww  w. j  a  va 2 s .  c o  m*/

import javax.swing.JButton;
import javax.swing.JSplitPane;

public class Main {
  public static void main(String[] argv) throws Exception {
    JButton leftComponent = new JButton("left");
    JButton rightComponent = new JButton("right");

    JButton topComponent = new JButton("top");
    JButton bottomComponent = new JButton("bottom");

    JSplitPane hpane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, leftComponent, rightComponent);

    JSplitPane vpane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, topComponent, bottomComponent);

    leftComponent = (JButton) hpane.getLeftComponent();
    rightComponent = (JButton) hpane.getRightComponent();

    topComponent = (JButton) vpane.getTopComponent();
    bottomComponent = (JButton) vpane.getBottomComponent();

    hpane.setLeftComponent(topComponent);
    hpane.setRightComponent(bottomComponent);

    vpane.setTopComponent(leftComponent);
    vpane.setBottomComponent(rightComponent);
  }
}