binary operators and bit masks in Java

BinaryOperationsAndBitmasks.java

public class BinaryOperationsAndBitmasks {

    public static void main(String[] args) {
        new BinaryOperationsAndBitmasks().bitsOperations();
    }

    /**
     * Basic bitmap operations
     */
    private void bitsOperations() {
        int a =     0b101;
        int b =     0b111;

        System.out.println("a: " + a);
        System.out.println("~a: " + ~a);
        System.out.println("a & ~a: " + (a & ~a));
        System.out.println("~a + 1: " + (~a + 1));//two's complement N -> -N

        System.out.println("b: " + b);
        System.out.println("~b: " + ~b);
        System.out.println("b & ~b: " + (b & ~b));
        System.out.println("~b + 1: " + (~b + 1));//two's complement N -> -N

        System.out.println("a & b: " + (a & b));
        System.out.println("a | b: " + (a | b));
        System.out.println("a ^ b: " + (a ^ b));// XOR 1 if different
    }

    /**
     * Get the number of bit used by a generic int
     * @return
     */
    private int getIntegerBitCount() {
        int a = Integer.MAX_VALUE;

        int bit_count = 1;

        while(((a >>> 1) & 1) == 1) {
            a = a >>> 1;
            bit_count++;
        }
        System.out.println(bit_count+1);
        return bit_count+1;//+1 for sign bit
    }

    /**
     * Bit mask usage
     */
    private void bitMask() {
        // indices: 0, 1, 2 , ..., N
        // mapping between indices and mask value
        // 0 -> 2^0
        // 1 -> 2^1
        // ....
        // N -> 2^N

        // masks
        short AMMO = 1;
        short LIFE = 2;
        short FOOD = 4;
        short WATER = 8;
        short FANTASY = 16;
        short PANDORA = 32;
        short TRAVEL = 64;

        // let's create a 32 bit bit mask
        int bitMask = 0; // set all bit to 0

        // if we want to raise the flag at position 1
        bitMask = bitMask | LIFE;

        // if we want to raise the flag at position 3
        bitMask = bitMask | WATER;

        // if we want to raise the flag at position 4
        bitMask = bitMask | FANTASY;

        // if we want to raise multiple flags
        bitMask = bitMask | AMMO | PANDORA | TRAVEL | FOOD; // we set to 1 indices 0, 5, 6

        System.out.println("Bitmask before unset:" + bitMask);

        // if we want to unflag indices
        bitMask &= ~(AMMO | LIFE | WATER | FANTASY | PANDORA | TRAVEL | FOOD);

        System.out.println("Bitmask after unset:" + bitMask);
    }
}