java-stream

Why not using vanilla Java : Collections.list(enumeration).stream()… However as mentionned by @MicahZoltu, the number of items in the enumeration has to be taken into account, as Collections.list will first iterate over the enumeration to copy the elements in an ArrayList. From there the regular stream method can be used. While this is usual for many … Read more

The official documentation for what you want to do: https://docs.oracle.com/javase/8/docs/api/java/util/stream/Collectors.html // Accumulate names into a List List<String> list = people.stream().map(Person::getName).collect(Collectors.toList()); // Convert elements to strings and concatenate them, separated by commas String joined = things.stream() .map(Object::toString) .collect(Collectors.joining(“, “)); For your example, you would need to do this: // Convert elements to strings and concatenate them, … Read more

Yes, you can modify state of objects inside your stream, but most often you should avoid modifying state of source of stream. From non-interference section of stream package documentation we can read that: For most data sources, preventing interference means ensuring that the data source is not modified at all during the execution of the … Read more