Question

I have this arrayList:

 ArrayList<ArrayList<Integer>> temporary = new ArrayList<ArrayList<Integer>>();

Some how I need to convert it to a int[][]

I have some sort of loop right?

               for(ArrayList<Integer> item: temporary) {
                    //Here??

                }

Cheers!

Im stuck because arrays arent dynamic(or what you call it).

Answer 1

This should work:

final int N = temporary.size();
int[][] a = new int[N][];
for (int i = 0; i < N; ++i) {
    final ArrayList<Integer> item = temporary.get(i);
    final int M = item.size();
    a[i] = new int[M];
    for (int j = 0; j < M; ++j) {
        a[i][j] = item.get(j); // assumes no null elements!
    }
}