Different Between ArrayList, IntArray and Array<Int> [duplicate]

Question

I am new in Java and Kotlin.

Recently when I read a tutorial while learning Kotlin.

I found there are some Array/List confusing me.

1. What is the different between ArrayList, IntArray and Array<Int>?
2. When should I use them?

Answer 1

Major differences

ArrayList : resizable, Generic (Objects)

IntArray : primitive, fix length, only Int values

Array<Int> : Generic (Objects), fix length