JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1996, 2005, 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.io;

/**
 * Exception indicating the failure of an object read operation due to
 * unread primitive data, or the end of data belonging to a serialized
 * object in the stream.  This exception may be thrown in two cases:
 *
 * <ul>
 *   <li>An attempt was made to read an object when the next element in the
 *       stream is primitive data.  In this case, the OptionalDataException's
 *       length field is set to the number of bytes of primitive data
 *       immediately readable from the stream, and the eof field is set to
 *       false.
 *
 *   <li>An attempt was made to read past the end of data consumable by a
 *       class-defined readObject or readExternal method.  In this case, the
 *       OptionalDataException's eof field is set to true, and the length field
 *       is set to 0.
 * </ul>
 *
 * @author  unascribed
 * @since   JDK1.1
 */
public class OptionalDataException extends ObjectStreamException {

    private static final long serialVersionUID = -8011121865681257820L;

    /*
     * Create an <code>OptionalDataException</code> with a length.
     */
    OptionalDataException(int len) {
        eof = false;
        length = len;
    }

    /*
     * Create an <code>OptionalDataException</code> signifying no
     * more primitive data is available.
     */
    OptionalDataException(boolean end) {
        length = 0;
        eof = end;
    }

    /**

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