declare namespace java {
    namespace nio {
        /**
         * A direct byte buffer whose content is a memory-mapped region of a file.
         * <p> Mapped byte buffers are created via the {@link
         * java.nio.channels.FileChannel#map FileChannel.map} method.  This class
         * extends the {@link ByteBuffer} class with operations that are specific to
         * memory-mapped file regions.
         * <p> A mapped byte buffer and the file mapping that it represents remain
         * valid until the buffer itself is garbage-collected.
         * <p> The content of a mapped byte buffer can change at any time, for example
         * if the content of the corresponding region of the mapped file is changed by
         * this program or another.  Whether or not such changes occur, and when they
         * occur, is operating-system dependent and therefore unspecified.
         * <a name="inaccess"></a><p> All or part of a mapped byte buffer may become
         * inaccessible at any time, for example if the mapped file is truncated.  An
         * attempt to access an inaccessible region of a mapped byte buffer will not
         * change the buffer's content and will cause an unspecified exception to be
         * thrown either at the time of the access or at some later time.  It is
         * therefore strongly recommended that appropriate precautions be taken to
         * avoid the manipulation of a mapped file by this program, or by a
         * concurrently running program, except to read or write the file's content.
         * <p> Mapped byte buffers otherwise behave no differently than ordinary direct
         * byte buffers. </p>
         * @author Mark Reinhold
         * @author JSR-51 Expert Group
         * @since 1.4
         */
        // @ts-ignore
        abstract class MappedByteBuffer extends java.nio.ByteBuffer {
            /**
             * Tells whether or not this buffer's content is resident in physical
             * memory.
             * <p> A return value of <tt>true</tt> implies that it is highly likely
             * that all of the data in this buffer is resident in physical memory and
             * may therefore be accessed without incurring any virtual-memory page
             * faults or I/O operations.  A return value of <tt>false</tt> does not
             * necessarily imply that the buffer's content is not resident in physical
             * memory.
             * <p> The returned value is a hint, rather than a guarantee, because the
             * underlying operating system may have paged out some of the buffer's data
             * by the time that an invocation of this method returns.  </p>
             * @return <tt>true</tt> if it is likely that this buffer's content
             *           is resident in physical memory
             */
            // @ts-ignore
            public isLoaded(): boolean
            /**
             * Loads this buffer's content into physical memory.
             * <p> This method makes a best effort to ensure that, when it returns,
             * this buffer's content is resident in physical memory.  Invoking this
             * method may cause some number of page faults and I/O operations to
             * occur. </p>
             * @return This buffer
             */
            // @ts-ignore
            public load(): java.nio.MappedByteBuffer
            /**
             * Forces any changes made to this buffer's content to be written to the
             * storage device containing the mapped file.
             * <p> If the file mapped into this buffer resides on a local storage
             * device then when this method returns it is guaranteed that all changes
             * made to the buffer since it was created, or since this method was last
             * invoked, will have been written to that device.
             * <p> If the file does not reside on a local device then no such guarantee
             * is made.
             * <p> If this buffer was not mapped in read/write mode ({@link
             * java.nio.channels.FileChannel.MapMode#READ_WRITE}) then invoking this
             * method has no effect. </p>
             * @return This buffer
             */
            // @ts-ignore
            public force(): java.nio.MappedByteBuffer
        }
    }
}