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

*** 1,7 ****
  /*
!  * Copyright (c) 2000, 2018, 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
--- 1,7 ----
  /*
!  * 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
*** 598,607 ****
--- 598,640 ----
       * @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