Concise way to get both min and max value of Java 8 stream

Question

Is there a concise way to extract both the min and max value of a stream (based on some comparator) in one pass?

There appear to be many ways to get the min and max values individually, or I can sort the stream into a temporary object, for example:

List<T> sorted = Stream.of(...).sorted().collect(Collectors.toList()); T min = sorted.get(0); T max = sorted.get(sorted.size() - 1); 

But this isn't concise and requires allocating a temporary object. I'd rather not allocate a temporary object or make two passes through the stream. Is there an alternative?

Pair<T> extent = Stream.of(...).??? 

Answer 1

The summarizingInt collector works well if you have a Stream of Integers.

IntSummaryStatistics stats = Stream.of(2,4,3,2)       .collect(Collectors.summarizingInt(Integer::intValue));  int min = stats.getMin(); int max = stats.getMax(); 

If you have doubles you can use the summarizingDouble collector.

DoubleSummaryStatistics stats2 = Stream.of(2.4, 4.3, 3.3, 2.5)   .collect(Collectors.summarizingDouble((Double::doubleValue)));