learn_code80 · 09.05.2026

How to initialize a List<T> in Kotlin? Breaking down all the ways

Hi everyone! I just started learning Kotlin after Java, and I ran into a problem: how to properly create and initialize a list? In Java, I used to do it like this: ```java List list = new ArrayList<>(); list.add("a"); list.add("b"); ``` But in Kotlin, I see there are some `listOf(...)`, `mutableListOf(...)`, and you can also use constructors. I tried writing: ```kotlin val list: List = listOf("a", "b") // this works list.add("c") // compilation error! ``` Why can't I add an element? And how do I make a mutable list? I also heard about `ArrayList()`, but I don't understand how to use it correctly in Kotlin. Please tell me all the possible ways to initialize lists so I don't get confused anymore. I need both for immutable (read-on

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