How to check if bit is set in byte java

Question

I have a byte, and I have a function that checks whether the n-th bit index of the byte is a 1 or a 0. The function returns true if the bit is a 1 and false if the bit is a 0.

How I do, Thank.

Answer 1

You need to and your value with a binary mask where the bit to test is set to 1:

boolean test(int value) {
     return (value & (1<<N)) != 0;
}

Here 1<<N constructs such a mask where bit N is set to 1, and the others are set to 0. Otherwise you can hand-craft your mask.