I know I should just look this up, but I’ll ask anyway.
Back in 2013, in grad school, I remember we used Objective C for iOS and Java for Android. Can I still build compatible apk’s and iOS packages using these older language choices respectively for modern mobile OS’s or am I a dinosaur and need to get with the times (swift and kotlin)?
For iOS you can still use Objective C, but there are additions to platform frameworks and whole new frameworks that are Swift first. I don’t really know how hard it would be to use those APIs from Objective C. Swift is certainly the default going forward.
I don’t work on Android but my understanding is that Java hasn’t and isn’t going anywhere on Android. Kotlin is supposed to be great but I haven’t heard mention of Java being dropped.