| 
   import java.io.FileOutputStream;
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.nio.channels.FileChannel;
 
 public class MainClass {
 public static void main(String args[]) {
 FileOutputStream fileOutputStream;
 FileChannel fileChannel;
 ByteBuffer byteBuffer;
 
 try {
 fileOutputStream = new FileOutputStream("test.txt");
 fileChannel = fileOutputStream.getChannel();
 byteBuffer = ByteBuffer.allocateDirect(26);
 
 for (int i = 0; i < 26; i++)
 byteBuffer.put((byte) ('A' + i));
 byteBuffer.rewind();
 fileChannel.write(byteBuffer);
 fileChannel.close();
 fileOutputStream.close();
 } catch (IOException exc) {
 System.out.println(exc);
 }
 }
 }
 
 
 
 
 
 
 |