8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

src/java.base/share/classes/java/util/RandomAccess.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2000, 2006, 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.util;
+
+/**
+ * Marker interface used by {@code List} implementations to indicate that
+ * they support fast (generally constant time) random access.  The primary
+ * purpose of this interface is to allow generic algorithms to alter their
+ * behavior to provide good performance when applied to either random or
+ * sequential access lists.
+ *
+ * <p>The best algorithms for manipulating random access lists (such as
+ * {@code ArrayList}) can produce quadratic behavior when applied to
+ * sequential access lists (such as {@code LinkedList}).  Generic list
+ * algorithms are encouraged to check whether the given list is an
+ * {@code instanceof} this interface before applying an algorithm that would
+ * provide poor performance if it were applied to a sequential access list,
+ * and to alter their behavior if necessary to guarantee acceptable
+ * performance.
+ *
+ * <p>It is recognized that the distinction between random and sequential
+ * access is often fuzzy.  For example, some {@code List} implementations
+ * provide asymptotically linear access times if they get huge, but constant
+ * access times in practice.  Such a {@code List} implementation
+ * should generally implement this interface.  As a rule of thumb, a
+ * {@code List} implementation should implement this interface if,
+ * for typical instances of the class, this loop:
+ * <pre>
+ *     for (int i=0, n=list.size(); i &lt; n; i++)
+ *         list.get(i);
+ * </pre>
+ * runs faster than this loop:
+ * <pre>
+ *     for (Iterator i=list.iterator(); i.hasNext(); )
+ *         i.next();
+ * </pre>
+ *
+ * <p>This interface is a member of the
+ * <a href="{@docRoot}/java/util/package-summary.html#CollectionsFramework">
+ * Java Collections Framework</a>.
+ *
+ * @since 1.4
+ */
+public interface RandomAccess {
+}