Bit operations are very strange help me

Question

class BitDemo {
     public static void main(String[] args) {
               int bitmask = 0x0000000F;
               int val = -3;
               System.out.println(val & bitmask);  // prints "13" why not 3
int zmienna = -3; // 1000 ... 0011   ( 2^31 = 2 147 483 647 )
System.out.println("zmienna >> 1  = "+ ( zmienna >> 1 ) ); //print -2 why not -1

Answer 1

What do you think the the bits in an int variable set to -3 look like?
Remember that negative numbers are stored in two's complement (http://en.wikipedia.org/wiki/Two%27s_complement that's the second time I post this link today and I didn't need it for a long time before, strange).