Method add

src/main/java/pascal/taie/util/collection/ArraySet.java:103–113

(E e)

    }

    @Override
    public boolean add(E e) {
        Objects.requireNonNull(e, NULL_MESSAGE);
        if (!elements.contains(e)) {
            ensureCapacity(size() + 1);
            elements.add(e);
            return true;
        } else {
            return false;
        }
    }

    @Override
    public boolean remove(Object o) {