C# in mono has the csharp interactive prompt, and you can also use it to run script files (like .csx). Java often uses IDE but there are tools to run a REPL. G

C# in mono has the csharp interactive prompt, and you can also use it to run script files (like .csx). Java often uses IDE but there are tools to run a REPL. Groovy had this before Java got it. You can use it to write Java, since Java code is Groovy. It comes with a GUI console into which you can type and evaluate too, or you can write script files and run them. It's not as fashionable nowadays as it used to be (now it's Kotlin, Scala, etc.) but it works great and can be useful for learning Java too.