Are Java 8 Streams the same as .Net IEnumerable? [closed]

Question

At first I thought Java Streams were necessarily related to I/O but they look really like the IEnumerable interface in .Net.

Is that comparison fair?

Answer 1

Maybe this is something interesting I found on google for you:

Streams

Java streams (not to be confused with InputStream and OutputStream) do more or less the same thing as LINQ, with parallel processing mirroring PLINQ. There isn't any nice SQL-like syntax to use, though - you have to do it function-style. And just as LINQ required extension methods, streams don't appear until Java 8 because they need defender methods to work with existing collection types.

Stream is largely equivalent to .NET IEnumerable. To see how they're similar, consider these examples:

// Write each value in a collection to standard output on a separate line:  // C# - LINQ myCollection.ForEach( x => Console.WriteLine(x) ); // Java - stream myCollection.stream().forEach( x -> System.out.println(x) );  // Sum all the values in a (potentially large) collection, using parallelism // if possible:  // C# - PLINQ int sum = myCollection.AsParallel().Aggregate( (x, y) => x + y ); // Java - parallel stream int sum = myCollection.stream().parallel().reduce( (x, y) -> x + y ); 

You would expect the stream() method to be on Iterable, in the same way as LINQ operates on IEnumerable, but it's on Collection instead. Perhaps it's because Java lacks yield-return semantics, so Iterable is just less interesting or useful in Java.

source: http://leftoblique.net/wp/2013/07/25/java-8-a-k-a-oracle-finally-catches-up-to-net-framework-3-0/

EDIT: There is a lot to find about it on Google. Here are some more interesting articles: https://web.archive.org/web/20130331002411/http://blog.informatech.cr/2013/03/24/java-streams-preview-vs-net-linq/