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import java.io.RandomAccessFile;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
public class MainClass {
public static void main(String[] argv) throws Exception {
RandomAccessFile raf = new RandomAccessFile("test.txt", "r");
FileChannel fc = raf.getChannel();
MappedByteBuffer buffer = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
buffer.clear();
buffer.flip();
System.out.println("hasArray=" + buffer.hasArray());
System.out.println(buffer.toString());
System.out.flush();
}
}
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