Fun with `var` in Java 11

Zaal 1

16:50 - 17:40

Java language

Since Java 10 you can use `var` to let the compiler infer a local variable’s type:

`var users = new ArrayList<User>()`

And that’s pretty much it, right? Surprisingly, no! There are a lot of details to consider…

* is this JavaScript?!
* how exactly is the type inferred?
* where can I use `var` and what should I look out for?
* won’t this lead to unreadable code?

… and a few fun things to do with `var`…

* playing with anonymous classes (don’t!)
* faking traits (don’t!)
* faking intersection types (do!)

After this live-coding deep dive into `var`, you’ll know all about Java 10’s flagship feature.