In my understanding next two methods must perform the same write action regarding I2C device and they both are correct
   
 private void writeWrong(int addr, byte data) throws IOException, InterruptedException {
        ByteBuffer buf = ByteBuffer.allocate(1);
        buf.put(data);

        i2cdevice.begin();
        i2cdevice.write(addr, 1, buf);
        i2cdevice.end();
        Thread.sleep(2000);
    }

 private void write(int addr, byte data) throws IOException, InterruptedException {
        byte[] bytes = new byte[]{
                data
        };

        i2cdevice.begin();
        i2cdevice.write(addr, 1, ByteBuffer.wrap(bytes));
        i2cdevice.end();

        Thread.sleep(2000);
    }

However, if we read immediately after write operation to verify the data, it occurs that writeWrong method does not actually write any data

  private byte read(int addr) throws IOException {
        byte[] bytes = new byte[1];
        i2cdevice.read(addr, 1, ByteBuffer.wrap(bytes));
        return bytes[0];
    }

so i.e.
int value = 16;
writeWrong(0x00, (byte) value);
read(0x00) = 0
write(0x00, (byte) value);
read(0x00) = 16