How to find the length of an array list?

Question

I don't know how to find the length of an array list. I think you might need to use blank.length(); but I'm not sure.

I made an array list

ArrayList<String> myList = new ArrayList<String>();

but how do I write code to print out the size of myList?

int size = myList.size(); Pls try reading Javadoc and some tutorial on using Java collections. — anubhava, Mar 11 '12 at 05:36
[Documentation](http://docs.oracle.com/javase/6/docs/api/java/util/ArrayList.html#size()) is your friend! — Andrew Marshall, Mar 11 '12 at 05:39
It was probably more effort to ask the question here than to google it. — Kyle, Mar 11 '12 at 05:39
@Kyle: Ah, but then you don't get any ego-boosting SO reputation points. — RenniePet, Jul 29 '13 at 19:50
@Kyle, also this question is now the top hit on google for "ArrayList length" — Dave Branton, Jan 27 '14 at 00:52
@Kyle: Much faster to google and read this post than to go through docs. — Floris, Jan 28 '14 at 09:48
@Kyle - Hopefully you figured this out on your own in the past 4 years, but simple questions like this one often become the top result on Google years later. Their asking is hugely beneficial to future people searching for the answer (like myself). — ArtOfWarfare, Mar 31 '16 at 20:57

score 271 · Answer 1 · edited Jul 02 '15 at 15:52

271

The size member function.

myList.size();

edited Jul 02 '15 at 15:52

Jordi Castilla

answered Mar 11 '12 at 05:36

Adam Reed

myList.size() gives actual no of elements in the list. Note that since indexing starts from 0, no of elements (according to indexing) will be size() - 1. – Vadiraj S J Apr 29 '19 at 07:11

score 41 · Answer 2 · edited Oct 24 '16 at 04:01

41

System.out.println(myList.size());

Since no elements are in the list

output => 0

myList.add("newString");  // use myList.add() to insert elements to the arraylist
System.out.println(myList.size());

Since one element is added to the list

output => 1

edited Oct 24 '16 at 04:01

answered Mar 11 '12 at 05:38

Sergej Raishin

2 Answers2