New Stream API and I/O streams - Any overlap?

Question

I know the new Stream API is for processing object streams, often from collections.
But is this notion applicable to I/O streams, too?
It definitely seems compelling to use a functional approach to I/O streams that supports parallelism.
Let me know if my question doesn't make any sense to you
Thanks
Oliver

Answer 1

Indeed, there is some interplay between the APIs.
For example BufferedReader defines a lines() method that returns a (lazily-read) Stream<String>, each element being a line. The Files class in java.nio.file has a utility lines(Path path) method.
So assuming you have some class MyClass, some MyClassParser with a parse method, you can use idioms like
void processFile(Path path) throws IOException {
    MyClassParser parser = ... ;
    try (Stream<String> lines = Files.lines(path)) {
        lines.map(parser::parse).forEach( myObject -> ...);
If you want to parallelize it, do
lines.parallel().map(parser::parse)...
(assuming your parser.parse method can handle multiple threads)