Question

I try to remove an element from vector of verctors in Java, and set this vector to the correct location.

So I try this, and of course it didn’t work because line (2) return Integer:

Definition:

Vector<Vector<Integer>> current_domain;

Vector<Integer> t = current_domain.get(k).remove(0);
current_domain.set(k, t);

Answer 1

Vector<Vector<Integer>> current_domain;

For the above Vector: –

current_domain.get(k)

returns a Vector<Integer>. And when you use remove(0) on it, you will get an integer, which you cannot assign to a Vector.

Also when you use: –

current_domain.get(k).remove(0);

It will modify your vector automatically. So you don’t need to set it again.

    Vector<Vector<Integer>> current_domain = new Vector<Vector<Integer>>();

    Vector<Integer> vect = new Vector<Integer>();
    vect.add(4);
    vect.add(5);

    current_domain.add(vect);
    current_domain.get(0).remove(0);

    System.out.println(current_domain);

OUTPUT : –

[[5]]

So, you can see that Vector is modified.

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As a side note, I would suggest to use ArrayList instead of Vector.