Java ByteBuffer get and set long type data

import java.nio.ByteBuffer;

public class Main {
  public static void main(String[] argv) throws Exception {
    ByteBuffer buf = ByteBuffer.allocate(100);

    // Put values of different types
    buf.putLong(123L);//from w w  w .  j a v a 2 s.  co  m

    // Reset position for reading
    buf.flip();

    // Retrieve the values
    long l = buf.getLong();
    
    System.out.println(l);
    
  }
}