DirectoryIteratorException.java 文件源码

/**
 * Called to read the object from a stream.
 *
 * @throws  InvalidObjectException
 *          if the object is invalid or has a cause that is not
 *          an {@code IOException}
 */
private void readObject(ObjectInputStream s)
    throws IOException, ClassNotFoundException
{
    s.defaultReadObject();
    Throwable cause = super.getCause();
    if (!(cause instanceof IOException))
        throw new InvalidObjectException("Cause must be an IOException");
}