IntelliJ IDEA is genuinely great. It helps that they were the ones who developed Kotlin, and a fair bit of the actual language changes were gacked from Kotlin. (Or you could say "prototyped and shown valuable in Kotlin".)
They are still hampered by lousy nullable support.
You didn't ask, but Spring still sucks. It's not part of the language but it's a ubiquitous framework.
IntelliJ IDEA is genuinely great. It helps that they were the ones who developed Kotlin, and a fair bit of the actual language changes were gacked from Kotlin. (Or you could say "prototyped and shown valuable in Kotlin".)
They are still hampered by lousy nullable support.
You didn't ask, but Spring still sucks. It's not part of the language but it's a ubiquitous framework.