Question

this code is just a test to find duplicates of a vector and remove them ,while removing the correspoding objects of 2 other vectors

This gives as output an Arrayoutofindex in line 3.Do you have any suggestions?

        for (int k = 0 ; k < vA.size() ; k++)
            {                       
                Object a = vA.elementAt(0);
                Object b = vA.elementAt(k);
                if(a == b && k!=0)
                {
                int duplicate = vA.indexOf(b);
                vA.removeElementAt(duplicate);
                vB.removeElementAt(duplicate);
                vC.removeElementAt(duplicate);                    
                }

Answer 1

for (int k = 0 ; k <= vA.size() ; k++)
k should run only from 0 to va.size() - 1 because it is zero-based, i.e. the first index is 0. Rewrite the loop statement as:

for (int k = 0 ; k < vA.size() ; k++)