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diff --git a/libjava/classpath/javax/swing/JButton.java b/libjava/classpath/javax/swing/JButton.java
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+/* JButton.java --
+   Copyright (C) 2002, 2004, 2005, 2006, 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., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 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 gnu.java.lang.CPStringBuilder;
+
+import javax.accessibility.Accessible;
+import javax.accessibility.AccessibleContext;
+import javax.accessibility.AccessibleRole;
+import javax.swing.plaf.ButtonUI;
+
+
+/**
+ * A general purpose push button. <code>JButton</code>s can display a label,
+ * an {@link Icon} or both.
+ *
+ * @author Ronald Veldema (rveldema@cs.vu.nl)
+ */
+public class JButton extends AbstractButton
+  implements Accessible
+{
+
+  /**
+   * Accessibility support for JButtons.
+   */
+  protected class AccessibleJButton
+    extends AbstractButton.AccessibleAbstractButton
+  {
+    /**
+     * Returns the accessible role that this component represents.
+     * This is {@link AccessibleRole#PUSH_BUTTON} for <code>JButton</code>s.
+     *
+     * @return the accessible role that this component represents
+     */
+    public AccessibleRole getAccessibleRole()
+    {
+      return AccessibleRole.PUSH_BUTTON;
+    }
+  }
+
+  private static final long serialVersionUID = -1907255238954382202L;
+
+  /**
+   * Indicates if this button is capable to become the default button.
+   */
+  private boolean defaultCapable;
+
+  /**
+   * Creates a new button with an empty string for the button text and no
+   * icon.
+   */
+  public JButton()
+  {
+    this(null, null);
+  }
+
+  /**
+   * Creates a new button from the specified action.
+   *
+   * @param a  the action (<code>null</code> permitted).
+   *
+   * @see AbstractButton#setAction(Action)
+   */
+  public JButton(Action a)
+  {
+    this();
+    setAction(a);
+  }
+
+  /**
+   * Creates a new button with the specified icon (and an empty string for
+   * the button text).
+   *
+   * @param icon  the icon (<code>null</code> permitted).
+   */
+  public JButton(Icon icon)
+  {
+    this(null, icon);
+  }
+
+  /**
+   * Creates a new button with the specified text and no icon.
+   *
+   * @param text  the button text (<code>null</code> permitted, will be
+   *     substituted by an empty string).
+   */
+  public JButton(String text)
+  {
+    this(text, null);
+  }
+
+  /**
+   * Creates a new button with the specified text and icon.
+   *
+   * @param text  the button text (<code>null</code> permitted, will be
+   *     substituted by an empty string).
+   * @param icon  the icon (<code>null</code> permitted).
+   */
+  public JButton(String text, Icon icon)
+  {
+    super();
+    setModel(new DefaultButtonModel());
+    init(text, icon);
+    defaultCapable = true;
+  }
+
+  protected void configurePropertiesFromAction(Action a)
+  {
+    super.configurePropertiesFromAction(a);
+  }
+
+  /**
+   * Returns the object that provides accessibility features for this
+   * <code>JButton</code> component.
+   *
+   * @return The accessible context (an instance of {@link AccessibleJButton}).
+   */
+  public AccessibleContext getAccessibleContext()
+  {
+    if (accessibleContext == null)
+      accessibleContext = new AccessibleJButton();
+    return accessibleContext;
+  }
+
+  /**
+   * Returns the suffix (<code>"ButtonUI"</code> in this case) used to
+   * determine the class name for a UI delegate that can provide the look and
+   * feel for a <code>JButton</code>.
+   *
+   * @return <code>"ButtonUI"</code>.
+   */
+  public String getUIClassID()
+  {
+    // Returns a string that specifies the name of the L&F class that renders
+    // this component.
+    return "ButtonUI";
+  }
+
+  /**
+   * Returns <code>true</code> if this button is the default button in
+   * its <code>JRootPane</code>. The default button gets automatically
+   * activated when the user presses <code>ENTER</code> (or whatever
+   * key this is bound to in the current Look and Feel).
+   *
+   * @return <code>true</code> if this button is the default button in
+   *         its <code>JRootPane</code>
+   *
+   * @see #isDefaultCapable()
+   * @see #setDefaultCapable(boolean)
+   * @see JRootPane#getDefaultButton()
+   * @see JRootPane#setDefaultButton(JButton)
+   */
+  public boolean isDefaultButton()
+  {
+    // The default button is managed by the JRootPane, so the safest way
+    // to determine this property is to ask the root pane of this button,
+    // if it exists.
+    JRootPane rp = SwingUtilities.getRootPane(this);
+    boolean isDefault = false;
+    if (rp != null)
+      isDefault = rp.getDefaultButton() == this;
+    return isDefault;
+  }
+
+  /**
+   * Returns <code>true</code> if this button can act as the default button.
+   * This is <code>true</code> by default.
+   *
+   * @return <code>true</code> if this button can act as the default button
+   *
+   * @see #setDefaultCapable(boolean)
+   * @see #isDefaultButton()
+   * @see JRootPane#getDefaultButton()
+   * @see JRootPane#setDefaultButton(JButton)
+   */
+  public boolean isDefaultCapable()
+  {
+    // Returns whether or not this button is capable of being the default
+    // button on the RootPane.
+    return defaultCapable;
+  }
+
+  /**
+   * Returns an implementation-dependent string describing the attributes of
+   * this <code>JButton</code>.
+   *
+   * @return A string describing the attributes of this <code>JButton</code>
+   *         (never <code>null</code>).
+   */
+  protected String paramString()
+  {
+    String superParam = super.paramString();
+
+    // 41 is the maximum number of chars which may be needed.
+    CPStringBuilder sb = new CPStringBuilder(41);
+    sb.append(",defaultButton=").append(isDefaultButton());
+    sb.append(",defaultCapable=").append(defaultCapable);
+
+    return superParam + sb.toString();
+  }
+
+  /**
+   * Overrides JComponent.removeNotify to check if this button is currently
+   * set as the default button on the RootPane, and if so, sets the RootPane's
+   * default button to null to ensure the RootPane doesn't hold onto an invalid
+   * button reference.
+   */
+  public void removeNotify()
+  {
+    JRootPane root = SwingUtilities.getRootPane(this);
+    if (root != null && root.getDefaultButton() == this)
+      root.setDefaultButton(null);
+    super.removeNotify();
+  }
+
+  /**
+   * Sets the <code>defaultCapable</code> property which indicates if
+   * this button may become the default button in its <code>JRootPane</code>.
+   *
+   * @param defaultCapable <code>true</code> if this button can become the
+   *        default button in its JRootPane, <code>false</code> otherwise
+   *
+   * @see #setDefaultCapable(boolean)
+   * @see #isDefaultButton()
+   * @see JRootPane#getDefaultButton()
+   * @see JRootPane#setDefaultButton(JButton)
+   */
+  public void setDefaultCapable(boolean defaultCapable)
+  {
+    this.defaultCapable = defaultCapable;
+  }
+
+  /**
+   * Sets this button's UI delegate to the default (obtained from the
+   * {@link UIManager}) for the current look and feel.
+   */
+  public void updateUI()
+  {
+    setUI((ButtonUI) UIManager.getUI(this));
+  }
+}