Streams: teeing runs two collectors in a single pass

var prices = List.of(120, 80, 250, 60, 190);

record Summary(long count, int total) {}
Summary s = prices.stream().collect(Collectors.teeing(
        Collectors.counting(),
        Collectors.summingInt(Integer::intValue),
        Summary::new));

System.out.println(s);
System.out.println("average = " + (s.total() / s.count()));

Summary[count=5, total=700]
average = 140