279      * @throws  IllegalArgumentException
 280      *          If the set contains an invalid combination of options
 281      * @throws  UnsupportedOperationException
 282      *          If the {@code file} is associated with a provider that does not
 283      *          support creating file channels, or an unsupported open option is
 284      *          specified
 285      * @throws  IOException
 286      *          If an I/O error occurs
 287      * @throws  SecurityException
 288      *          If a security manager is installed and it denies an
 289      *          unspecified permission required by the implementation.
 290      *          In the case of the default provider, the {@link
 291      *          SecurityManager#checkRead(String)} method is invoked to check
 292      *          read access if the file is opened for reading. The {@link
 293      *          SecurityManager#checkWrite(String)} method is invoked to check
 294      *          write access if the file is opened for writing
 295      */
 296     public static AsynchronousFileChannel open(Path file, OpenOption... options)
 297         throws IOException
 298     {
 299         Set<OpenOption> set = new HashSet<OpenOption>(options.length);
 300         Collections.addAll(set, options);
 301         return open(file, set, null, NO_ATTRIBUTES);
 302     }
 303 
 304     /**
 305      * Returns the current size of this channel's file.
 306      *
 307      * @return  The current size of this channel's file, measured in bytes
 308      *
 309      * @throws  ClosedChannelException
 310      *          If this channel is closed
 311      * @throws  IOException
 312      *          If some other I/O error occurs
 313      */
 314     public abstract long size() throws IOException;
 315 
 316     /**
 317      * Truncates this channel's file to the given size.
 318      *
 319      * <p> If the given size is less than the file's current size then the file

 279      * @throws  IllegalArgumentException
 280      *          If the set contains an invalid combination of options
 281      * @throws  UnsupportedOperationException
 282      *          If the {@code file} is associated with a provider that does not
 283      *          support creating file channels, or an unsupported open option is
 284      *          specified
 285      * @throws  IOException
 286      *          If an I/O error occurs
 287      * @throws  SecurityException
 288      *          If a security manager is installed and it denies an
 289      *          unspecified permission required by the implementation.
 290      *          In the case of the default provider, the {@link
 291      *          SecurityManager#checkRead(String)} method is invoked to check
 292      *          read access if the file is opened for reading. The {@link
 293      *          SecurityManager#checkWrite(String)} method is invoked to check
 294      *          write access if the file is opened for writing
 295      */
 296     public static AsynchronousFileChannel open(Path file, OpenOption... options)
 297         throws IOException
 298     {
 299         Set<OpenOption> set = new HashSet<>(options.length);
 300         Collections.addAll(set, options);
 301         return open(file, set, null, NO_ATTRIBUTES);
 302     }
 303 
 304     /**
 305      * Returns the current size of this channel's file.
 306      *
 307      * @return  The current size of this channel's file, measured in bytes
 308      *
 309      * @throws  ClosedChannelException
 310      *          If this channel is closed
 311      * @throws  IOException
 312      *          If some other I/O error occurs
 313      */
 314     public abstract long size() throws IOException;
 315 
 316     /**
 317      * Truncates this channel's file to the given size.
 318      *
 319      * <p> If the given size is less than the file's current size then the file