Help with longs in byteBuffers

Question

Ok so bassiclly I want to send a long file over a network in an byteArray, my filesize is stored as a long but im having problems using longs with byteArray.
long log = 12;
byte[] bytes = new byte[10];
ByteBuffer buf = ByteBuffer.wrap(bytes);
    buf.putFloat(0 , log);
    long t =  buf.getLong(0);
    System.out.println(t);I dont understand why this doesnt print the correct value of 12. Im getting 4701758010974797824 printed out.
Also seeing as I wraped the byte array in the buffer does it auto put the values in the byte array called bytes.
Thanks

Answer 1

Because you called putFloat instead of putLong. puts should match gets, otherwise you confuse the encodings.
Also, you are better off using relative puts and gets. Just don't forget to flip the buffer:
import java.nio.*;
public class BufferExample2 {
    public static void main(String[] args) {
        long log = 12;
        byte[] bytes = new byte[10];
        ByteBuffer buf = ByteBuffer.wrap(bytes);
        buf.putLong(log);
        buf.flip();
        long t =  buf.getLong();
        System.out.println(t);
}