public class MoyenneWritable implements Writable
{
    private double total = 0.0;
    private long nombre = 0L;

    public void write(DataOutput sortie) throws IOException {
        sortie.writeDouble(total);
        sortie.writeLong(nombre);
    }

    public void readFields(DataInput entree) throws IOException {
        total  = entree.readDouble();
        nombre = entree.readLong();
    }
}