JetBrains Academy: Functional data processing with streams - Kamil-Jankowski/Learning-JAVA GitHub Wiki
Finding max and min elements:
Implement a method for finding min and max elements of a stream in accordance with a given comparator.
The found elements pass to minMaxConsumer in the following way:
minMaxConsumer.accept(min, max);
If the stream doesn't contain any elements, invoke:
minMaxConsumer.accept(null, null);
public static <T> void findMinMax(
Stream<? extends T> stream,
Comparator<? super T> order,
BiConsumer<? super T, ? super T> minMaxConsumer) {
// your implementation here
Deque<T> sortedElements = stream.sorted(order).collect(Collectors.toCollection(ArrayDeque::new));
if (sortedElements.isEmpty()) {
minMaxConsumer.accept(null, null);
} else {
T min = sortedElements.pollFirst();
T max = sortedElements.pollLast();
minMaxConsumer.accept(min, max);
}or
public static <T> void findMinMax(
Stream<? extends T> stream,
Comparator<? super T> order,
BiConsumer<? super T, ? super T> minMaxConsumer) {
// your implementation here
List<T> fromStream = stream.collect(Collectors.toList());
if (fromStream.isEmpty()) {
minMaxConsumer.accept(null, null);
} else {
T min = fromStream.stream().min(order).get();
T max = fromStream.stream().max(order).get();
minMaxConsumer.accept(min, max);
}
}