I'm trying to sort a Vector in java but my Vector is not a vector of int, it is a vector of objects

the object is :

 public MyObject()
    {
        numObj = 0;
        price = new Price();
        pax = new Pax();

    }

so I have a Vector of MyObject and I want to order it by numObject, how do i do it, i'm new in java?

thank you so much for all your help