Java 9 is Coming and Adds a REPL
InfoWorld takes a look on Oracle's upcoming release of Java 9. The big new feature of Java 9 is the inclusion of a REPL bringing it more in line with other modern languages.
That sounds like a little thing but a REPL is actually rather a big deal for Java developers. Coming from the Node.js, Ruby, Python and similar worlds having a REPL is just assumed. Working without one is pretty crippling.
Forgive my ignorance... but REPL?
Read - Eval - Print Loop
It's a way to use the programming language without having to write an entire program first.