[npa]

"i want to count the number of set-bits in an interger!":

(can't take credit for this one):

public final static int getBits(int i) {
        i = ((i & 0xaaaaaaaa) >> 1) + (i & 0x55555555);
        i = ((i & 0xcccccccc) >> 2) + (i & 0x33333333);
        i = ((i >> 4) + i) & 0x0f0f0f0f;

        i += i >> 8;
        i += i >> 16;

        return i & 0xff;
    }