e168. determining if a bytebuffer is direct.txt

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A non-direct ByteBuffer is one where the contents are stored in the normal memory. A direct ByteBuffer is one where the contents are stored in some I/O device such as a disk drive or video board. 
See also e158 Creating a ByteBuffer. 

    ByteBuffer bbuf = ByteBuffer.wrap(new byte[10]);
    boolean isDirect = bbuf.isDirect();  // false
    
    bbuf = ByteBuffer.allocate(10);
    isDirect = bbuf.isDirect();          // false
    
    bbuf = ByteBuffer.allocateDirect(10);
    isDirect = bbuf.isDirect();          // true