Question

I have a byte[] that I’ve read from a file, and I want to get an int from two bytes in it. Here’s an example:

byte[] bytes = new byte[] {(byte)0x00, (byte)0x2F, (byte)0x01, (byte)0x10, (byte)0x6F};
int value = bytes.getInt(2,4); //This method doesn't exist

This should make value equal to 0x0110, or 272 in decimal. But obviously, byte[].getInt() doesn’t exist. How can I accomplish this task?

The above array is just an example. Actual values are unknown to me.

Answer 1

You should just opt for the simple:

int val = ((bytes[2] & 0xff) << 8) | (bytes[3] & 0xff);

You could even write your own helper function getBytesAsWord (byte[] bytes, int start) to give you the functionality if you didn’t want the calculations peppering your code but I think that would probably be overkill.