import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.ClipboardOwner;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.Toolkit;
import java.io.*;

public final class TextTransfer implements ClipboardOwner {


   private  Clipboard clipboard = new Clipboard ("My first clipboard");
    // private Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();



  public static void main (String[]  aArguments ){
    TextTransfer textTransfer = new TextTransfer();

    //display what is currently on the clipboard
    System.out.println("Clipboard contains:" + textTransfer.getClipboardContents() );

    //change the contents and then re-display
    textTransfer.setClipboardContents("Everything that has a beginning has an end");

    System.out.println("Clipboard contains:" + textTransfer.getClipboardContents() );
  }

   /**
   * Empty implementation of the ClipboardOwner interface.
   */
   public void lostOwnership( Clipboard aClipboard, Transferable aContents) {
     //do nothing
   }

  /**
  * Place a String on the clipboard, and make this class the
  * owner of the Clipboard's contents.
  */
  public void setClipboardContents( String aString ){
    StringSelection stringSelection = new StringSelection( aString );
//    Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
    clipboard.setContents( stringSelection, this );
  }

  /**
  * Get the String residing on the clipboard.
  *
  * @return any text found on the Clipboard; if none found, return an
  * empty String.
  */
  public String getClipboardContents() {
    String result = "";
	
    Transferable contents = clipboard.getContents(null);
    boolean hasTransferableText = (contents != null) &&
                                  contents.isDataFlavorSupported(DataFlavor.stringFlavor);
    if ( hasTransferableText ) {
      try {
        result = (String)contents.getTransferData(DataFlavor.stringFlavor);
      }
      catch (UnsupportedFlavorException ex){
        
        System.out.println(ex);
      }
      catch (IOException ex) {
        System.out.println(ex);
      }
   }
    return result;
  }
}