content: /*
   * Copyright (c) 2003, 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.lang;
  
  import java.io.IOException;
  
  /**
   * A <tt>Readable</tt> is a source of characters. Characters from
   * a <tt>Readable</tt> are made available to callers of the read
   * method via a {@link java.nio.CharBuffer CharBuffer}.
   *
   * @since 1.5
   */
  public interface Readable {
  
      /**
       * Attempts to read characters into the specified character buffer.
       * The buffer is used as a repository of characters as-is: the only
       * changes made are the results of a put operation. No flipping or
       * rewinding of the buffer is performed.
       *
       * @param cb the buffer to read characters into
       * @return The number of {@code char} values added to the buffer,
       *                 or -1 if this source of characters is at its end
       * @throws IOException if an I/O error occurs
       * @throws NullPointerException if cb is null
       * @throws java.nio.ReadOnlyBufferException if cb is a read only buffer
       */
      public int read(java.nio.CharBuffer cb) throws IOException;
  }
  