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

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

return (n >> k) & 1;

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

If lowest significant bit is bit number 0:

return (n>>k)&1;

or use:

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

if you want a boolean value