How can one read an integer bit by bit in Java?

Question

I would like to take an int as input, and return the kth bit.

int getBit(int n, int k){
    return kth bit in n;
}

How would i do this?

Answer 1

Using bitwise operators:

int getBit(int n, int k) {     return (n >> k) & 1; } 

Explanation (in bits):

n 100010101011101010 (example) n >> 5 000001000101010111 (all bits are moved over 5 spots, therefore &                   the bit you want is at the end) 000000000000000001 (0 means it will always be 0, =                   1 means that it will keep the old value) 1 

Answer 2

return (n >> k) & 1;

Here, n >> k shifts the k-th bit into the least significant position, and & 1 masks out everything else.