Simplest way to create a stream from a Java object?

Question

With Collection everything is clear, but what about the following:

There is an object with a count() method and a getPart(int i) method. So extracting all objects leads to the following boilerplate code:

List<Part> result = new ArrayList<Part>(); for (int i = 0, i < object.count(), i++) {     result.add(object.getPart(i));         } return result.stream();  

Is there any standard way to pass just 2 producers: () -> object.count() and (int i) -> object.getPart(i) to create a stream? Like this:

SomeUtil.stream(object::count, object::getPart); 

Answer 1

Try this:

IntStream.range(0, object.count()).mapToObj(object::getPart);