--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/lang/CharSequence.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,111 @@
+/*
+ * Copyright 2000-2003 Sun Microsystems, Inc.  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.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package java.lang;
+
+
+/**
+ * A <tt>CharSequence</tt> is a readable sequence of <code>char</code> values. This
+ * interface provides uniform, read-only access to many different kinds of
+ * <code>char</code> sequences.
+ * A <code>char</code> value represents a character in the <i>Basic
+ * Multilingual Plane (BMP)</i> or a surrogate. Refer to <a
+ * href="Character.html#unicode">Unicode Character Representation</a> for details.
+ *
+ * <p> This interface does not refine the general contracts of the {@link
+ * java.lang.Object#equals(java.lang.Object) equals} and {@link
+ * java.lang.Object#hashCode() hashCode} methods.  The result of comparing two
+ * objects that implement <tt>CharSequence</tt> is therefore, in general,
+ * undefined.  Each object may be implemented by a different class, and there
+ * is no guarantee that each class will be capable of testing its instances
+ * for equality with those of the other.  It is therefore inappropriate to use
+ * arbitrary <tt>CharSequence</tt> instances as elements in a set or as keys in
+ * a map. </p>
+ *
+ * @author Mike McCloskey
+ * @since 1.4
+ * @spec JSR-51
+ */
+
+public interface CharSequence {
+
+    /**
+     * Returns the length of this character sequence.  The length is the number
+     * of 16-bit <code>char</code>s in the sequence.</p>
+     *
+     * @return  the number of <code>char</code>s in this sequence
+     */
+    int length();
+
+    /**
+     * Returns the <code>char</code> value at the specified index.  An index ranges from zero
+     * to <tt>length() - 1</tt>.  The first <code>char</code> value of the sequence is at
+     * index zero, the next at index one, and so on, as for array
+     * indexing. </p>
+     *
+     * <p>If the <code>char</code> value specified by the index is a
+     * <a href="Character.html#unicode">surrogate</a>, the surrogate
+     * value is returned.
+     *
+     * @param   index   the index of the <code>char</code> value to be returned
+     *
+     * @return  the specified <code>char</code> value
+     *
+     * @throws  IndexOutOfBoundsException
+     *          if the <tt>index</tt> argument is negative or not less than
+     *          <tt>length()</tt>
+     */
+    char charAt(int index);
+
+    /**
+     * Returns a new <code>CharSequence</code> that is a subsequence of this sequence.
+     * The subsequence starts with the <code>char</code> value at the specified index and
+     * ends with the <code>char</code> value at index <tt>end - 1</tt>.  The length
+     * (in <code>char</code>s) of the
+     * returned sequence is <tt>end - start</tt>, so if <tt>start == end</tt>
+     * then an empty sequence is returned. </p>
+     *
+     * @param   start   the start index, inclusive
+     * @param   end     the end index, exclusive
+     *
+     * @return  the specified subsequence
+     *
+     * @throws  IndexOutOfBoundsException
+     *          if <tt>start</tt> or <tt>end</tt> are negative,
+     *          if <tt>end</tt> is greater than <tt>length()</tt>,
+     *          or if <tt>start</tt> is greater than <tt>end</tt>
+     */
+    CharSequence subSequence(int start, int end);
+
+    /**
+     * Returns a string containing the characters in this sequence in the same
+     * order as this sequence.  The length of the string will be the length of
+     * this sequence. </p>
+     *
+     * @return  a string consisting of exactly this sequence of characters
+     */
+    public String toString();
+
+}