Problem of the Day

Problem:

The remove method given here takes an ArrayList<Integer> as a parameter and removes values from it.

public static void remove(ArrayList<Integer> vals)
{
    int i = 0;
    while (i < vals.size())
    {
        boolean found = false;
        int j = i + 1;
        while (j < vals.size())
        {
            if (vals.get(j) == vals.get(i))
            {
                found = true;
                vals.remove(j);
            }
            else
            {
                j++;
            }      
        }
        if (found)
            vals.remove(i);
        i++;
    }
}

Which best describes the function of the remove method?

1. It removes any two numbers in the list that have the same value.
2. It removes any numbers that occur more than once in the list.
3. It removes any numbers that occur both at the beginning of the list and elsewhere in the list.
4. It removes the first occurrence of any number in the list that appears more than once.

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