I have a usecase where I want to modify some entries in a list based on some condition and leave the rest as it is. For this I am thinking of using java streams but I could not find a solution that will work. I know using
map won’t work as it will filter out the elements which do not satisfy the condition. Is there something that I can use?
List<Integer> a = new ArrayList<>(); a.add(1); a.add(2); // I want to get square of element if element is even // Current solution List<Integer> b = a.stream().filter(i -> i % 2 == 0).map(i -> i * i).collect(Collectors.toList()); // This outputs - b =  // But I want - b = [1, 4]
You can make the map operation conditional and remove the filter:
List<Integer> b = a.stream() .map(i -> i % 2 == 0 ? i * i : i) .collect(Collectors.toList());
Answered By – Chaosfire
Answer Checked By – Senaida (Easybugfix Volunteer)