Bit level operations in Java

Question

I'm trying to make some bit operations in Java for applying masks, represent sets etc. Why:

int one=1;
int two=2;
int andop=1&2;
System.out.println(andop);

Prints a "0" when is supposed to be "3":

0...001
0...010
_______
0...011

And how can I get that behavior?

Thanks in advance

Answer 1

Use the binary 'or' operator:

int andop = 1 | 2;

The binary 'and' operator will leave bits sets that are in both sides; in the case of 1 and 2 that is no bits at all.

Answer 2

You mixed up bitwise OR and bitwise AND