Java: Interleave two integer based arraylists -> good approach?

Question

Homework: Looking for better strategy, or approach rather than complete code.

I\'v got two arrayLists of integers under two conditions:

1. th

Answer 1

This is my approach.

public static void interleave(ArrayList a1, ArrayList a2) {
    int start = 0;
    int i;
    int size = a1.size();
    for (i = 1; i < a1.size(); i += 2) {
        if (start < a2.size()) {
            a1.add(i, a2.get(start++));
        }
    }
    while (a1.size() < (size + a2.size())) {
        a1.add(i++, a2.get(start++));
    }

}