Is there a way to get the i(i changes) lsb from an int?

Question

I'm working on a project in java recently and i would like to handle the bits of an integer so that i can check the i lsb of a number. I have found a lot of approaches but nothing that can handle properly...

Example

key= 4 Key 4 in binary is 100 I would like in some way to extract the 3rd LSB of 4 which is 1. Is there an algorithm that can do that?

Answer 1

Using bit-shifting and bitwise AND: (indexed from 0)

int getBit(int number, int index)
{
  return (number >> index) & 1;
}

getBit(4, 2) returns 1.

You can also use % 2 instead of & 1.