Int a = 42; Int? b = a; if (b != null) { List<Int> list = [a, b]; List<Int> square = list.map(x -> x * x); var Int c = square[0]; c = square[1]; }

が↓に変換されてくれるようなイメージ。

final int a = 42; @Nullable final Integer b = a; if (b != null) { @NotNull final Integer b_ = b; @NotNull final List<Integer> list = List<Integer>.of(a, b_); @NotNull final List<Integer> square = list.stream().map(x -> x * x).collect(Collectors.toList()); int c = square.get(0); c = square.get(1); }