src/java.base/share/classes/java/nio/Buffer.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2019, 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

@@ -598,10 +598,43 @@
      * @since 9
      */
     public abstract Buffer slice();
 
     /**
+     * Creates a new buffer whose content is a shared subsequence of
+     * this buffer's content.
+     *
+     * <p> The new buffer will start at position {@code index} in this buffer
+     * and will contain {@code length} elements. Changes to this buffer's
+     * content will be visible in the new buffer, and vice versa; the two
+     * buffers' position, limit, and mark values will be independent.
+     *
+     * <p> The new buffer's position will be zero, its capacity and its limit
+     * will be {@code length}, its mark will be undefined. The new buffer will
+     * be direct if, and only if, this buffer is direct, and it will be
+     * read-only if, and only if, this buffer is read-only.  </p>
+     *
+     * @param   index 
+     *          The position in this buffer at which the content of the new
+     *          buffer will start; must be non-negative and less than
+     *          {@link #limit() limit()}
+     *
+     * @param   length
+     *          The number of elements the new buffer will contain; must be
+     *          non-negative and no larger than {@code limit() - index}
+     *
+     * @return  The new buffer
+     *
+     * @throws  IndexOutOfBoundsException
+     *          If {@code index} is negative or not less than {@code limit()},
+     *          {@code length} is negative, or {@code length > limit() - index}
+     *
+     * @since 13
+     */
+    public abstract Buffer slice(int index, int length);
+
+    /**
      * Creates a new buffer that shares this buffer's content.
      *
      * <p> The content of the new buffer will be that of this buffer.  Changes
      * to this buffer's content will be visible in the new buffer, and vice
      * versa; the two buffers' position, limit, and mark values will be