Copy, Cut and Paste in Java!

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.ClipboardOwner;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextArea;

/**
 * The Class ClipBoard.
 *
 * @author Varra
 * @version 1.0
 */
public class ClipBoard extends JFrame implements ClipboardOwner, ActionListener
{
   
    /** The Constant serialVersionUID. */
    private static final long serialVersionUID = 1L;
   
    /** The dst text. */
    JTextArea srcText, dstText;
   
    /** The paste button. */
    JButton copyButton, pasteButton;
   
    /** The clipboard. */
    Clipboard clipboard = getToolkit().getSystemClipboard();
   
    /**
     * Instantiates a new clip board.
     */
    public ClipBoard()
    {
        super("Clipboard Test");
        GridBagLayout gridbag = new GridBagLayout();
        GridBagConstraints c = new GridBagConstraints();
        setLayout(gridbag);
        srcText = new JTextArea(8, 32);
        c.gridwidth = 2;
        c.anchor = GridBagConstraints.CENTER;
        gridbag.setConstraints(srcText, c);
        add(srcText);
        copyButton = new JButton("Copy Above");
        copyButton.setActionCommand("copy");
        copyButton.addActionListener(this);
        c.gridy = 1;
        c.gridwidth = 1;
        gridbag.setConstraints(copyButton, c);
        add(copyButton);
        pasteButton = new JButton("Paste Below");
        pasteButton.setActionCommand("paste");
        pasteButton.addActionListener(this);
        pasteButton.setEnabled(false);
        c.gridx = 1;
        gridbag.setConstraints(pasteButton, c);
        add(pasteButton);
        dstText = new JTextArea(8, 32);
        c.gridx = 0;
        c.gridy = 2;
        c.gridwidth = 2;
        gridbag.setConstraints(dstText, c);
        add(dstText);
        pack();
    }
   
    /*
     * (non-Javadoc)
     *
     * @see
     * java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
     */
    public void actionPerformed(ActionEvent evt)
    {
        String cmd = evt.getActionCommand();
        if (cmd.equals("copy"))
        {
            // Implement Copy operation
            String srcData = srcText.getText();
            if (srcData != null)
            {
                StringSelection contents = new StringSelection(srcData);
                clipboard.setContents(contents, this);
                pasteButton.setEnabled(true);
            }
        }
        else if (cmd.equals("paste"))
        {
            // Implement Paste operation
            Transferable content = clipboard.getContents(this);
            if (content != null)
            {
                try
                {
                    String dstData = (String) content.getTransferData(DataFlavor.stringFlavor);
                    dstText.append(dstData);
                }
                catch (Exception e)
                {
                    System.out.println("Couldn't get contents in format: "
                            + DataFlavor.stringFlavor.getHumanPresentableName());
                }
            }
        }
    }
   
    /*
     * (non-Javadoc)
     *
     * @see
     * java.awt.datatransfer.ClipboardOwner#lostOwnership(java.awt.datatransfer
     * .Clipboard, java.awt.datatransfer.Transferable)
     */
    public void lostOwnership(Clipboard clipboard, Transferable contents)
    {
        System.out.println("Clipboard contents replaced");
    }
   
    /**
     * The main method.
     *
     * @param args
     *            the arguments
     */
    public static void main(String[] args)
    {
        ClipBoard test = new ClipBoard();
        test.setVisible(true);
    }
}