Logic and integer arithmetic

class VulcanCounter {
    void incrementLogically() {
        int spock = 0;
        while (true) {
            int tempSpock = spock;
            for (int i = 0; i < 32; ++i) {
                int mask = 0x1 << i;
                if ((tempSpock & mask) == 0) {
                    tempSpock |= mask;
                    break;
                }
                else {
                    tempSpock &= mask;
                }
            }
            spock = tempSpock;
        }
    }
}

 0 iconst_0          // Push int constant 0.
 1 istore_0          // Pop to local variable 0: int spock = 0;
 2 iconst_0          // Push int constant 0.
 3 istore_1          // Pop to local variable 1: int i = 0;
 4 goto 33           // Jump unconditionally ()
 7 iconst_1          // Push int constant 1.
 8 iload_1           // Push local variable 1 (i).
 9 ishl              // Arithmetic shift left top int (i) by next to top int (1).
10 istore_2          // Pop to local variable 2: int mask = i << 0x1;
11 iload_0           // Push local variable 0 (spock).
12 iload_2           // Push local variable 2 (mask).
13 iand              // Bitwise AND top two ints: (spock & mask)
14 ifne 24           // Jump if top of stack is not equal to zero: if ((spock & mask) == 0) {
17 iload_0           // Push local variable 0 (spock).
18 iload_2           // Push local variable 2 (mask).
19 ior               // Bitwise OR top two ints (spock | mask)
20 istore_0          // Pop to local variable 0: spock |= mask;
21 goto 2            // Jump unconditionally (to top of while): break;
24 iload_0           // Push local variable 0 (spock).
25 iload_2           // Push local variable 2 (mask).
26 iconst_m1         // Push -1.
27 ixor              // Bitwise EXCLUSIVE-OR top two ints: mask
28 iand              // Bitwise AND top two ints: spock & (mask)
29 istore_0          // Pop to local variable 2: spock &= mask;
30 iinc 1 1          // Increment local variable 1 by 1: ++i
33 iload_1           // Push local variable 1 (i).
34 bipush 32         // Push integer constant 32.
36 if_icmplt 7       // Jump (to top of for) if next to top integer is less than top
                     //      integer: i < 32
39 goto 2            // Jump unconditionally (to top of while).