Java Code:
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.dnd.ByteArrayTransfer;
import org.eclipse.swt.dnd.Clipboard;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.FileTransfer;
import org.eclipse.swt.dnd.HTMLTransfer;
import org.eclipse.swt.dnd.RTFTransfer;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.dnd.TransferData;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.DirectoryDialog;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.List;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableItem;
import org.eclipse.swt.widgets.Text;

public class ClipboardExample {

  Clipboard clipboard;

  Shell shell;

  Text copyText;

  Text pasteText;

  Text copyRtfText;

  Text pasteRtfText;

  Text copyHtmlText;

  Text pasteHtmlText;

  Table copyFileTable;

  Table pasteFileTable;

  Text text;

  Combo combo;

  StyledText styledText;

  Label status;

  static final int SIZE = 60;

  public static void main(String[] args) {
    Display display = new Display();
    new ClipboardExample().open(display);
    display.dispose();
  }

  public void open(Display display) {
    clipboard = new Clipboard(display);
    shell = new Shell(display);
    shell.setText("SWT Clipboard");
    shell.setLayout(new FillLayout());

    ScrolledComposite sc = new ScrolledComposite(shell, SWT.H_SCROLL
        | SWT.V_SCROLL);
    Composite parent = new Composite(sc, SWT.NONE);
    sc.setContent(parent);
    parent.setLayout(new GridLayout(2, true));

    Group copyGroup = new Group(parent, SWT.NONE);
    copyGroup.setText("Copy From:");
    GridData data = new GridData(GridData.FILL_BOTH);
    copyGroup.setLayoutData(data);
    copyGroup.setLayout(new GridLayout(3, false));

    Group pasteGroup = new Group(parent, SWT.NONE);
    pasteGroup.setText("Paste To:");
    data = new GridData(GridData.FILL_BOTH);
    pasteGroup.setLayoutData(data);
    pasteGroup.setLayout(new GridLayout(3, false));

    Group controlGroup = new Group(parent, SWT.NONE);
    controlGroup.setText("Control API:");
    data = new GridData(GridData.FILL_BOTH);
    data.horizontalSpan = 2;
    controlGroup.setLayoutData(data);
    controlGroup.setLayout(new GridLayout(5, false));

    Group typesGroup = new Group(parent, SWT.NONE);
    typesGroup.setText("Available Types");
    data = new GridData(GridData.FILL_BOTH);
    data.horizontalSpan = 2;
    typesGroup.setLayoutData(data);
    typesGroup.setLayout(new GridLayout(2, false));

    status = new Label(parent, SWT.BORDER);
    data = new GridData(GridData.FILL_HORIZONTAL);
    data.horizontalSpan = 2;
    data.heightHint = 60;
    status.setLayoutData(data);

    createTextTransfer(copyGroup, pasteGroup);
    createRTFTransfer(copyGroup, pasteGroup);
    createHTMLTransfer(copyGroup, pasteGroup);
    createFileTransfer(copyGroup, pasteGroup);
    createMyTransfer(copyGroup, pasteGroup);
    createControlTransfer(controlGroup);
    createAvailableTypes(typesGroup);

    sc.setMinSize(parent.computeSize(SWT.DEFAULT, SWT.DEFAULT));
    sc.setExpandHorizontal(true);
    sc.setExpandVertical(true);

    Point size = shell.computeSize(SWT.DEFAULT, SWT.DEFAULT);
    Rectangle monitorArea = shell.getMonitor().getClientArea();
    shell.setSize(Math.min(size.x, monitorArea.width - 20), Math.min(
        size.y, monitorArea.height - 20));
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    clipboard.dispose();
  }

  void createTextTransfer(Composite copyParent, Composite pasteParent) {

    // TextTransfer
    Label l = new Label(copyParent, SWT.NONE);
    l.setText("TextTransfer:"); //$NON-NLS-1$
    copyText = new Text(copyParent, SWT.MULTI | SWT.BORDER | SWT.V_SCROLL
        | SWT.H_SCROLL);
    copyText.setText("some\nplain\ntext");
    GridData data = new GridData(GridData.FILL_HORIZONTAL);
    data.heightHint = data.widthHint = SIZE;
    copyText.setLayoutData(data);
    Button b = new Button(copyParent, SWT.PUSH);
    b.setText("Copy");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        String data = copyText.getText();
        if (data.length() > 0) {
          status.setText("");
          clipboard.setContents(new Object[] { data },
              new Transfer[] { TextTransfer.getInstance() });
        } else {
          status.setText("nothing to copy");
        }
      }
    });

    l = new Label(pasteParent, SWT.NONE);
    l.setText("TextTransfer:"); //$NON-NLS-1$
    pasteText = new Text(pasteParent, SWT.READ_ONLY | SWT.MULTI
        | SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
    data = new GridData(GridData.FILL_HORIZONTAL);
    data.heightHint = data.widthHint = SIZE;
    pasteText.setLayoutData(data);
    b = new Button(pasteParent, SWT.PUSH);
    b.setText("Paste");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        String data = (String) clipboard.getContents(TextTransfer
            .getInstance());
        if (data != null && data.length() > 0) {
          status.setText("");
          pasteText.setText("begin paste>" + data + "<end paste");
        } else {
          status.setText("nothing to paste");
        }
      }
    });
  }

  void createRTFTransfer(Composite copyParent, Composite pasteParent) {
    // RTF Transfer
    Label l = new Label(copyParent, SWT.NONE);
    l.setText("RTFTransfer:"); //$NON-NLS-1$
    copyRtfText = new Text(copyParent, SWT.MULTI | SWT.BORDER
        | SWT.V_SCROLL | SWT.H_SCROLL);
    copyRtfText.setText("some\nrtf\ntext");
    GridData data = new GridData(GridData.FILL_HORIZONTAL);
    data.heightHint = data.widthHint = SIZE;
    copyRtfText.setLayoutData(data);
    Button b = new Button(copyParent, SWT.PUSH);
    b.setText("Copy");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        String data = copyRtfText.getText();
        if (data.length() > 0) {
          status.setText("");
          data = "{\\rtf1{\\colortbl;\\red255\\green0\\blue0;}\\uc1\\b\\i "
              + data + "}";
          clipboard.setContents(new Object[] { data },
              new Transfer[] { RTFTransfer.getInstance() });
        } else {
          status.setText("nothing to copy");
        }
      }
    });

    l = new Label(pasteParent, SWT.NONE);
    l.setText("RTFTransfer:"); //$NON-NLS-1$
    pasteRtfText = new Text(pasteParent, SWT.READ_ONLY | SWT.MULTI
        | SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
    data = new GridData(GridData.FILL_HORIZONTAL);
    data.heightHint = data.widthHint = SIZE;
    pasteRtfText.setLayoutData(data);
    b = new Button(pasteParent, SWT.PUSH);
    b.setText("Paste");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        String data = (String) clipboard.getContents(RTFTransfer
            .getInstance());
        if (data != null && data.length() > 0) {
          status.setText("");
          pasteRtfText.setText("start paste>" + data + "<end paste");
        } else {
          status.setText("nothing to paste");
        }
      }
    });
  }

  void createHTMLTransfer(Composite copyParent, Composite pasteParent) {
    // HTML Transfer
    Label l = new Label(copyParent, SWT.NONE);
    l.setText("HTMLTransfer:"); //$NON-NLS-1$
    copyHtmlText = new Text(copyParent, SWT.MULTI | SWT.BORDER
        | SWT.V_SCROLL | SWT.H_SCROLL);
    copyHtmlText.setText("<b>Hello World</b>");
    GridData data = new GridData(GridData.FILL_HORIZONTAL);
    data.heightHint = data.widthHint = SIZE;
    copyHtmlText.setLayoutData(data);
    Button b = new Button(copyParent, SWT.PUSH);
    b.setText("Copy");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        String data = copyHtmlText.getText();
        if (data.length() > 0) {
          status.setText("");
          clipboard.setContents(new Object[] { data },
              new Transfer[] { HTMLTransfer.getInstance() });
        } else {
          status.setText("nothing to copy");
        }
      }
    });

    l = new Label(pasteParent, SWT.NONE);
    l.setText("HTMLTransfer:"); //$NON-NLS-1$
    pasteHtmlText = new Text(pasteParent, SWT.READ_ONLY | SWT.MULTI
        | SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
    data = new GridData(GridData.FILL_HORIZONTAL);
    data.heightHint = data.widthHint = SIZE;
    pasteHtmlText.setLayoutData(data);
    b = new Button(pasteParent, SWT.PUSH);
    b.setText("Paste");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        String data = (String) clipboard.getContents(HTMLTransfer
            .getInstance());
        if (data != null && data.length() > 0) {
          status.setText("");
          pasteHtmlText.setText("start paste>" + data + "<end paste");
        } else {
          status.setText("nothing to paste");
        }
      }
    });
  }

  void createFileTransfer(Composite copyParent, Composite pasteParent) {
    // File Transfer
    Label l = new Label(copyParent, SWT.NONE);
    l.setText("FileTransfer:"); //$NON-NLS-1$

    Composite c = new Composite(copyParent, SWT.NONE);
    c.setLayout(new GridLayout(2, false));
    GridData data = new GridData(GridData.FILL_HORIZONTAL);
    c.setLayoutData(data);

    copyFileTable = new Table(c, SWT.MULTI | SWT.BORDER);
    data = new GridData(GridData.FILL_HORIZONTAL);
    data.heightHint = data.widthHint = SIZE;
    data.horizontalSpan = 2;
    copyFileTable.setLayoutData(data);

    Button b = new Button(c, SWT.PUSH);
    b.setText("Select file(s)");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        FileDialog dialog = new FileDialog(shell, SWT.OPEN | SWT.MULTI);
        String result = dialog.open();
        if (result != null && result.length() > 0) {
          // copyFileTable.removeAll();
          String separator = System.getProperty("file.separator");
          String path = dialog.getFilterPath();
          String[] names = dialog.getFileNames();
          for (int i = 0; i < names.length; i++) {
            TableItem item = new TableItem(copyFileTable, SWT.NONE);
            item.setText(path + separator + names[i]);
          }
        }
      }
    });
    b = new Button(c, SWT.PUSH);
    b.setText("Select directory");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        DirectoryDialog dialog = new DirectoryDialog(shell, SWT.OPEN);
        String result = dialog.open();
        if (result != null && result.length() > 0) {
          // copyFileTable.removeAll();
          TableItem item = new TableItem(copyFileTable, SWT.NONE);
          item.setText(result);
        }
      }
    });

    b = new Button(copyParent, SWT.PUSH);
    b.setText("Copy");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        TableItem[] items = copyFileTable.getItems();
        if (items.length > 0) {
          status.setText("");
          String[] data = new String[items.length];
          for (int i = 0; i < data.length; i++) {
            data[i] = items[i].getText();
          }
          clipboard.setContents(new Object[] { data },
              new Transfer[] { FileTransfer.getInstance() });
        } else {
          status.setText("nothing to copy");
        }
      }
    });

    l = new Label(pasteParent, SWT.NONE);
    l.setText("FileTransfer:"); //$NON-NLS-1$
    pasteFileTable = new Table(pasteParent, SWT.MULTI | SWT.BORDER);
    data = new GridData(GridData.FILL_HORIZONTAL);
    data.heightHint = data.widthHint = SIZE;
    pasteFileTable.setLayoutData(data);
    b = new Button(pasteParent, SWT.PUSH);
    b.setText("Paste");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        String[] data = (String[]) clipboard.getContents(FileTransfer
            .getInstance());
        if (data != null && data.length > 0) {
          status.setText("");
          pasteFileTable.removeAll();
          for (int i = 0; i < data.length; i++) {
            TableItem item = new TableItem(pasteFileTable, SWT.NONE);
            item.setText(data[i]);
          }
        } else {
          status.setText("nothing to paste");
        }
      }
    });
  }

  void createMyTransfer(Composite copyParent, Composite pasteParent) {
    // MyType Transfer
    // TODO
  }

  void createControlTransfer(Composite parent) {
    Label l = new Label(parent, SWT.NONE);
    l.setText("Text:");
    Button b = new Button(parent, SWT.PUSH);
    b.setText("Cut");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        text.cut();
      }
    });
    b = new Button(parent, SWT.PUSH);
    b.setText("Copy");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        text.copy();
      }
    });
    b = new Button(parent, SWT.PUSH);
    b.setText("Paste");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        text.paste();
      }
    });
    text = new Text(parent, SWT.BORDER | SWT.MULTI | SWT.H_SCROLL
        | SWT.V_SCROLL);
    GridData data = new GridData(GridData.FILL_HORIZONTAL);
    data.heightHint = data.widthHint = SIZE;
    text.setLayoutData(data);

    l = new Label(parent, SWT.NONE);
    l.setText("Combo:");
    b = new Button(parent, SWT.PUSH);
    b.setText("Cut");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        combo.cut();
      }
    });
    b = new Button(parent, SWT.PUSH);
    b.setText("Copy");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        combo.copy();
      }
    });
    b = new Button(parent, SWT.PUSH);
    b.setText("Paste");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        combo.paste();
      }
    });
    combo = new Combo(parent, SWT.NONE);
    combo.setItems(new String[] { "Item 1", "Item 2", "Item 3",
        "A longer Item" });

    l = new Label(parent, SWT.NONE);
    l.setText("StyledText:");
    l = new Label(parent, SWT.NONE);
    l.setVisible(false);
    b = new Button(parent, SWT.PUSH);
    b.setText("Copy");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        styledText.copy();
      }
    });
    b = new Button(parent, SWT.PUSH);
    b.setText("Paste");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        styledText.paste();
      }
    });
    styledText = new StyledText(parent, SWT.BORDER | SWT.MULTI
        | SWT.H_SCROLL | SWT.V_SCROLL);
    data = new GridData(GridData.FILL_HORIZONTAL);
    data.heightHint = data.widthHint = SIZE;
    styledText.setLayoutData(data);
  }

  void createAvailableTypes(Composite parent) {
    final List list = new List(parent, SWT.BORDER | SWT.H_SCROLL
        | SWT.V_SCROLL);
    GridData data = new GridData(GridData.FILL_BOTH);
    data.heightHint = 100;
    list.setLayoutData(data);
    Button b = new Button(parent, SWT.PUSH);
    b.setText("Get Available Types");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        list.removeAll();
        String[] names = clipboard.getAvailableTypeNames();
        for (int i = 0; i < names.length; i++) {
          list.add(names[i]);
        }
      }
    });
  }
}

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors: IBM Corporation - initial API and implementation
 ******************************************************************************/
class MyTypeTransfer extends ByteArrayTransfer {

  private static final String MYTYPENAME = "name_list"; //$NON-NLS-1$

  private static final int MYTYPEID = registerType(MYTYPENAME);

  private static MyTypeTransfer _instance = new MyTypeTransfer();

  public static MyTypeTransfer getInstance() {
    return _instance;
  }

  public void javaToNative(Object object, TransferData transferData) {
    if (!checkMyType(object) || !isSupportedType(transferData)) {
      DND.error(DND.ERROR_INVALID_DATA);
    }
    MyType[] myTypes = (MyType[]) object;
    try {
      // write data to a byte array and then ask super to convert to
      // pMedium
      ByteArrayOutputStream out = new ByteArrayOutputStream();
      DataOutputStream writeOut = new DataOutputStream(out);
      for (int i = 0, length = myTypes.length; i < length; i++) {
        byte[] buffer = myTypes[i].firstName.getBytes();
        writeOut.writeInt(buffer.length);
        writeOut.write(buffer);
        buffer = myTypes[i].firstName.getBytes();
        writeOut.writeInt(buffer.length);
        writeOut.write(buffer);
      }
      byte[] buffer = out.toByteArray();
      writeOut.close();
      super.javaToNative(buffer, transferData);
    } catch (IOException e) {
    }
  }

  public Object nativeToJava(TransferData transferData) {
    if (isSupportedType(transferData)) {

      byte[] buffer = (byte[]) super.nativeToJava(transferData);
      if (buffer == null)
        return null;

      MyType[] myData = new MyType[0];
      try {
        ByteArrayInputStream in = new ByteArrayInputStream(buffer);
        DataInputStream readIn = new DataInputStream(in);
        while (readIn.available() > 20) {
          MyType datum = new MyType();
          int size = readIn.readInt();
          byte[] name = new byte[size];
          readIn.read(name);
          datum.firstName = new String(name);
          size = readIn.readInt();
          name = new byte[size];
          readIn.read(name);
          datum.lastName = new String(name);
          MyType[] newMyData = new MyType[myData.length + 1];
          System.arraycopy(myData, 0, newMyData, 0, myData.length);
          newMyData[myData.length] = datum;
          myData = newMyData;
        }
        readIn.close();
      } catch (IOException ex) {
        return null;
      }
      return myData;
    }

    return null;
  }

  protected String[] getTypeNames() {
    return new String[] { MYTYPENAME };
  }

  protected int[] getTypeIds() {
    return new int[] { MYTYPEID };
  }

  boolean checkMyType(Object object) {
    if (object == null || !(object instanceof MyType[])
        || ((MyType[]) object).length == 0)
      return false;
    MyType[] myTypes = (MyType[]) object;
    for (int i = 0; i < myTypes.length; i++) {
      if (myTypes[i] == null || myTypes[i].firstName == null
          || myTypes[i].firstName.length() == 0
          || myTypes[i].lastName == null
          || myTypes[i].lastName.length() == 0)
        return false;
    }
    return true;
  }

  protected boolean validate(Object object) {
    return checkMyType(object);
  }
}

/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors: IBM Corporation - initial API and implementation
 ******************************************************************************/
class MyType {
  String firstName;

  String lastName;
}