public boolean equals(Object obj) {
        if (obj == this) {
            return true;   
        }
        if (!(obj instanceof ValueTick)) {
            return false;
        }
        ValueTick that = (ValueTick) obj;
        if (this.value != that.value) {
            return false;   
        }
        if (!this.tickType.equals(that.tickType)) {
            return false;
        }
        return super.equals(obj);