Adding elements to global list object in scala -

allright guys, pardon me if question has been asked. yet scala newbie question. example if want have global list object can used place holder container, in java can do;

//share list object private list<string> strlist = new arraylist<>(); void add(string el) {  strlist.add(e); }  static void main(string[] args) {  {   add("36 chambers");   out.println(strlist.get(0));//assume element } 

similarly, if simulate same syntax in scala - end java.lang.indexoutofboundsexception: 0. how can 1 achieve similar simple scala?

  private var strlist: list[string] = nil   def add(el: string) {     strlist :+ el   }    def main(args: array[string]) {        add("36 chambers")     println(s(0)) //assume element   }  

to strictly answer question:

private var strlist: list[string] = nil def add(el: string) {        strlist = el :: strlist; } 

you using wrong operator. need use ::. , need update inline because list of immutable length.

i'm switching el , strlist because :: right associative, means method comes object right of :: operator.

also, :: operator perform prepend, means elements in reverse order.

you can either call reverse @ end(before usage etc) or if want semantically similar java arraylist perhaps consider scala listbuffer, mutable collection can append.

import scala.collection.mutable.listbuffer; private var strlist: listbuffer[string] = nil def add(el: string) {        strlist += el; }