How to switch tabs in jTabbedPane by clicking a Button?

I have two JTabbedPanes, JTabbedPane1 & 2 How can I press button in JTabbedPane2 to show JTabbedPane1 ?

Here is the code for JTabbedPane:

public class TabbedPane extends JFrame {

    public TabbedPane() {


        setTitle("Tabbed Pane");  
        setSize(300,300); 

        JTabbedPane jtp = new JTabbedPane();

       getContentPane().add(jtp);

       JPanel1 jp1 = new JPanel1();//This will create the first tab

       JPanel jp2 = new JPanel2();//This will create the second tab

       //add panel .........

    //example usage
     public static void main (String []args){
        TabbedPane tab = new TabbedPane();
    }

}

here is class JPane1:

...    JLabel label1 = new JLabel();
       label1.setText("This is Tab 1");
       jp1.add(label1);

and class Jpane2 with button on int

JButton test = new JButton("Press"); jp2.add(test);

ButtonHandler phandler = new ButtonHandler();
test.addActionListener(phandler);
setVisible(true); 

} so problem is here in ActionListener of button on Jpanel2

class ButtonHandler implements ActionListener{
       public void actionPerformed(ActionEvent e){
              // what i do now ? to call  jpanel 1 show ![alt text][1]
       }
}

If you make the tabbed pane accessible to ButtonHandler you can do this:

class ButtonHandler implements ActionListener{
       public void actionPerformed(ActionEvent e){
              jtp.setSelectedIndex(0);
       }
}

You can do this by making jtp (ideally with a better name) a private attribute with a getter method or it can be passed in as a constructor argument to ButtonHandler.