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diff --git a/javax/swing/Popup.java b/javax/swing/Popup.java
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+/* Popup.java --
+   Copyright (C) 2003 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package javax.swing;
+
+import java.awt.Component;
+
+
+/**
+ * Manages a popup window that displays a Component on top of
+ * everything else.
+ *
+ * <p>To obtain an instance of <code>Popup</code>, use the
+ * {@link javax.swing.PopupFactory}.
+ *
+ * @since 1.4
+ *
+ * @author Sascha Brawer (brawer@dandelis.ch)
+ */
+public class Popup
+{
+  /**
+   * Constructs a new <code>Popup</code> given its owner,
+   * contents and the screen position where the popup
+   * will appear.
+   *
+   * @param owner the Component to which <code>x</code> and
+   *        <code>y</code> are relative, or <code>null</code> for
+   *        placing the popup relative to the origin of the screen.
+   *
+   * @param contents the contents that will be displayed inside
+   *        the <code>Popup</code>.
+   *
+   * @param x the horizontal position where the Popup will appear.
+   *
+   * @param y the vertical position where the Popup will appear.
+   *
+   * @throws IllegalArgumentException if <code>contents</code>
+   *         is <code>null</code>.
+   */
+  protected Popup(Component owner, Component contents,
+                  int x, int y)
+  {
+    if (contents == null)
+      throw new IllegalArgumentException();
+
+    // The real stuff happens in the implementation of subclasses,
+    // for instance JWindowPopup.
+  }
+  
+  
+  /**
+   * Constructs a new <code>Popup</code>.
+   */
+  protected Popup()
+  {
+  }
+
+
+  /**
+   * Displays the <code>Popup</code> on the screen.  Nothing happens
+   * if it is currently shown.
+   */
+  public void show()
+  {
+    // Implemented by subclasses, for instance JWindowPopup.
+  }
+
+
+  /**
+   * Removes the <code>Popup</code> from the screen.  Nothing happens
+   * if it is currently hidden.
+   */
+  public void hide()
+  {
+    // Implemented by subclasses, for instance JWindowPopup.
+  }
+
+
+  /**
+   * A <code>Popup</code> that uses a <code>JWindow</code> for
+   * displaying its contents.
+   *
+   * @see PopupFactory#getPopup
+   *
+   * @author Sascha Brawer (brawer@dandelis.ch)
+   */
+  static class JWindowPopup
+    extends Popup
+  {
+    /**
+     * The <code>JWindow</code> used for displaying the contents
+     * of the popup.
+     */
+    JWindow window;
+
+
+    /**
+     * Constructs a new <code>JWindowPopup</code> given its owner,
+     * contents and the screen position where the popup
+     * will appear.
+     *
+     * @param owner the Component to which <code>x</code> and
+     *        <code>y</code> are relative, or <code>null</code> for
+     *        placing the popup relative to the origin of the screen.
+     *
+     * @param contents the contents that will be displayed inside
+     *        the <code>Popup</code>.
+     *
+     * @param x the horizontal position where the Popup will appear.
+     *
+     * @param y the vertical position where the Popup will appear.
+     *
+     * @throws IllegalArgumentException if <code>contents</code>
+     *         is <code>null</code>.
+     */
+    public JWindowPopup(Component owner, Component contents,
+                        int x, int y)
+    {
+      /* Checks whether contents is null. */
+      super(owner, contents, x, y);
+
+      window = new JWindow();
+      window.getRootPane().add(contents);
+      window.setLocation(x, y);
+      window.pack();
+    }
+
+
+    /**
+     * Displays the popup&#x2019;s <code>JWindow</code> on the screen.
+     * Nothing happens if it is already visible.
+     */
+    public void show()
+    {
+      window.show();
+    }
+    
+    
+    /**
+     * Removes the popup&#x2019;s <code>JWindow</code> from the
+     * screen.  Nothing happens if it is currently not visible.
+     */
+    public void hide()
+    {
+      /* Calling dispose() instead of hide() will conserve native
+       * system resources, for example memory in an X11 server.
+       * They will automatically be re-allocated by a call to
+       * show().
+       */
+      window.dispose();
+    }
+  }
+}