How is the listOf structure implemented internally and how does it work under the hood?

In Android (specifically in Kotlin), the listOf() function creates an immutable list (List), which is internally implemented as an array.

When calling listOf(vararg elements), an object of type ArrayList or a specialized implementation is created, which stores elements in an array. This list does not support modification operations (adding, removing), ensuring its immutability.

Example:

val list = listOf(1, 2, 3)
println(list[0])  // 1
// list.add(4) // Compilation error, as the list is immutable

Thus, listOf is a convenient way to create a fixed list with quick index access and guaranteed content stability.