Acessando Área de Transferência

import java.awt.*;
import java.awt.datatransfer.*;

class TesteClipboard {
    public static void main(String[] args) throws Exception {
        Clipboard clip = Toolkit.getDefaultToolkit().getSystemClipboard();
        StringSelection ss = new StringSelection ("Alô, mundo!");
        clip.setContents (ss, ss);
    }
}