Java Coding Problems

Infinite sequential ordered stream

An infinite sequential ordered stream can be obtained via Stream.iterate​(T seed, UnaryOperator<T> f). The resulting stream starts from the specified seed and continues by applying the f function to the previous element (for example, the n element is f(n-1)).

For example, a stream of integers of type 1, 2, 3, ..., n can be created as follows:

Stream<Integer> infStream = Stream.iterate(1, i -> i + 1);

Furthermore, we can use this stream for a variety of purposes. For example, let's use it to fetch a list of the first 10 even integers:

List<Integer> result = infStream  .filter(i -> i % 2 == 0)  .limit(10)  .collect(Collectors.toList());

The List content will be as follows (notice that the infinite stream will ...