private boolean[] bits;

public BitVector and(BitVector anotherVector) {

    if (this == anotherVector) return (BitVector) clone();

    if (size() != anotherVector.size())
        throw new IllegalArgumentException("Incompatible sizes: size="+size()+", other.size()="+anotherVector.size());

    BitVector intersectionVector = new BitVector(size());
    for (int i = 0; i < size(); i++){
        if (get(i) & anotherVector.get(i))
            intersectionVector.set(i);
    }

    return intersectionVector;
}


public Object clone() {

    BitVector clone = null;
    try {
        clone = (BitVector) super.clone();
    } catch (CloneNotSupportedException e) {
        e.printStackTrace();
    }

    if (this.bits != null) clone.bits = this.bits.clone();
    return clone;
}

public void set(int index){
    bits[index] = true;
}

public boolean get(int index){
    return bits[index];
}

public int size() {
    return this.bits.length;
}