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/*

* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.

* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.

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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;

}