As for example, there are two lists:
List list1 = Arrays.asList(1.0, 2.0);
List list2 = Arrays.asList(\"one_point_zero\", \"two_p
This works for me but is O(n^2):
Map<Double, String> collect =
list1.stream()
.collect(
toMap(Double::doubleValue,
item -> list2.get(list1.indexOf(item))));
Instead of using an auxiliary list to hold the indices, you can have them generated by an IntStream
.
Map<Double, String> map = IntStream.range(0, list1.size())
.boxed()
.collect(Collectors.toMap(i -> list1.get(i), i -> list2.get(i)));
Indeed the best approach is to use IntStream.range(startInclusive, endExclusive) in order to access to each element of both lists with get(index) and finally use Math.min(a, b) to avoid getting IndexOutOfBoundsException
if the lists are not of the exact same size, so the final code would be:
Map<Double, String> map2 = IntStream.range(0, Math.min(list1.size(), list2.size()))
.boxed()
.collect(Collectors.toMap(list1::get, list2::get));