Auto set array of string to clipboard one by one when pressing key

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Java

clipboard

Eclipse

When i copy a texts (separated by tab), my program split the copied texts and store in the array of string. when i press the button it will display the array of text one by one and display along with set the text to clipboard. i am able to display text but not able to set in the clipboard. Can any one correct my code. my code is given below. thanks in advance.

import java.awt.*;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.event.*;
import javax.swing.*;

class MyProj {
public static void main(String [] args) throws Exception {

	Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
	String result = (String) clipboard.getData(DataFlavor.stringFlavor);
	
	StringSelection stringSelection = new StringSelection (aa[i]);
	clipboard.setContents (stringSelection, null);
	
    Buttonpanel panela = new Buttonpanel();
    panela.getstring(result);

    JFrame Frame = new JFrame("hiiiiii");
    Buttonpanel panel = new Buttonpanel();
    
    Frame.add(panel);
    Frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Frame.setBounds(700,300,300,200);
    Frame.setVisible(true);
	}
}

class Buttonpanel extends JPanel implements ActionListener {

JButton button;
JLabel label;

static String[] aa ;
String bb = "";
static int i = 0;

Buttonpanel()
{
    button = new JButton("Push");
    add(button);
    button.addActionListener(this);
    label = new JLabel("hiiii");
    add(label);
}

void getstring(String bb)
{
	aa = bb.split("	");	
}

public void actionPerformed(ActionEvent e)
{
    label.setText(aa[i]);
   System.out.println(""+ i );  //loop working here
	i ++;
}
}

What I have tried:

i am able to display text but not able to set in the clipboard. Can any one correct my code. my code is given below. thanks in advance.