I've got a sequence of integers (List<Integer>) and want to convert it to a string. I don't see why this code doesn't work:
sequence.stream().map(n -> n == 1 ? "+" : (n == -1 ? "-" : Integer.toString(n))).collect(Collectors.joining(","));
As you see, I want 1 to be represented as + and -1 as -.
I get the error message Type mismatch: cannot convert from Stream<Object> to <unknown>.
EDIT
After reading the comment knowing that Java is alright:
Eclipse isn't aware of n == 1 ? "+" : (n == -1 ? "-" : Integer.toString(n))).toString() beeing a String.
sequence.stream().map(n -> (String)((n == 1 ? "+" : (n == -1 ? "-" : Integer.toString(n))))).collect(Collectors.joining(","))
works fine.
EDIT
if you extract it to a function, Eclipse knows its a String:
private static String format(Integer n) {
return n == 1 ? "+" : (n == -1 ? "-" : Integer.toString(n));
}
(String) and comes up again with Type mismatch: cannot convert from Stream<Object> to <unknown>. Maybe that's because I'm using AutoFormat on save.
