Modifying local variable from inside lambda

Question

Modifying a local variable in forEach gives a compile error:

Normal

    int ordinal = 0;
    for (Example s : list) {
          


        

Answer 1

An alternative to AtomicInteger (or any other object able to store a value) is to use an array:

final int ordinal[] = new int[] { 0 };
list.forEach ( s -> s.setOrdinal ( ordinal[ 0 ]++ ) );

But see the Stuart's answer: there might be a better way to deal with your case.