import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class SplitDemo extends JFrame implements ActionListener
{
   int orie;
   JSplitPane jsp;
   JPanel p1;
   JPanel p2;
   JPanel p3;
   JButton bt;
   public SplitDemo()
   {
     Container cp=getContentPane();
     p1=new JPanel();
     p2=new JPanel();
     p3=new JPanel();
     bt=new JButton("Change Orientation");
     cp.setLayout(new BorderLayout());
     p3.setLayout(new FlowLayout());
     jsp=new JSplitPane(JSplitPane.VERTICAL_SPLIT,p1,p2);
     jsp.setOneTouchExpandable(true);
     cp.add(jsp,BorderLayout.CENTER);
     p3.add(bt);
     cp.add(p3,BorderLayout.SOUTH);
     bt.addActionListener(this);
     p1.setBackground(Color.WHITE);
     p2.setBackground(Color.WHITE);
     orie=0;
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     setSize(400,300);
     show();
    }
    public void actionPerformed(ActionEvent ae)
     {
        if(ae.getSource()==bt)
	  {
	     if(orie==0)
	      {
	        jsp.setOrientation(JSplitPane.HORIZONTAL_SPLIT);
		orie=1;
	      }
	      else
	      {
	         jsp.setOrientation(JSplitPane.VERTICAL_SPLIT);
		 orie=0;
	      }
	  } 
     }
     public static void main(String args[])
      {
        new SplitDemo();
      }
}