--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.security.acl/share/classes/java/security/acl/Group.java	Sun Aug 17 15:54:13 2014 +0100
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package java.security.acl;
+
+import java.util.Enumeration;
+import java.security.Principal;
+
+/**
+ * This interface is used to represent a group of principals. (A principal
+ * represents an entity such as an individual user or a company). <p>
+ *
+ * Note that Group extends Principal. Thus, either a Principal or a Group can
+ * be passed as an argument to methods containing a Principal parameter. For
+ * example, you can add either a Principal or a Group to a Group object by
+ * calling the object's {@code addMember} method, passing it the
+ * Principal or Group.
+ *
+ * @author      Satish Dharmaraj
+ */
+public interface Group extends Principal {
+
+    /**
+     * Adds the specified member to the group.
+     *
+     * @param user the principal to add to this group.
+     *
+     * @return true if the member was successfully added,
+     * false if the principal was already a member.
+     */
+    public boolean addMember(Principal user);
+
+    /**
+     * Removes the specified member from the group.
+     *
+     * @param user the principal to remove from this group.
+     *
+     * @return true if the principal was removed, or
+     * false if the principal was not a member.
+     */
+    public boolean removeMember(Principal user);
+
+    /**
+     * Returns true if the passed principal is a member of the group.
+     * This method does a recursive search, so if a principal belongs to a
+     * group which is a member of this group, true is returned.
+     *
+     * @param member the principal whose membership is to be checked.
+     *
+     * @return true if the principal is a member of this group,
+     * false otherwise.
+     */
+    public boolean isMember(Principal member);
+
+
+    /**
+     * Returns an enumeration of the members in the group.
+     * The returned objects can be instances of either Principal
+     * or Group (which is a subclass of Principal).
+     *
+     * @return an enumeration of the group members.
+     */
+    public Enumeration<? extends Principal> members();
+
+}