Reactive Streams in Java: Concurrency with RxJava, Reactor, and Akka Streams

Appendix A: Java 10 and 11

Java 10 was released on March 20, 2018. The main substantial update of Java 10 was Local Variable Type Inference (var). It also included enhancements for garbage collection and compilation, but that will not affect how we write our code.

Local Variable Types

Although “var” is not a new keyword, it is a context-sensitive type and represents a huge leap forward for Java developers . It allows you to substitute a type declaration with “var” whenever the type can be clearly inferred from context by the Java compiler.

For example, given a test on our “doParallelSquares” method, we can rewrite it for Java 10+ in the following way:

@Test

public void testDoParallelSquares() {

  var result = demo.doParallelSquares()

   .stream().sorted().collect(Collectors.toList()); ...