Difference between ArrayListMultimap.create() and RowData = new ArrayList();

Question

I would like to ask what is the difference between

ArrayListMultimap.create()

And

RowData = new ArrayList().

I know the first one is used for Multimaps and the latter is used for lists but I once used the ArrayListMultimap.create() in a code and it can return values like this:

{[Color, Fruit], [Pink,Orange]}

Whereas the latter returns:

[Color,Fruit,Pink,Orange]

I was expecting that RowData = new ArrayList() can return values the way ArrayListMultimap.create() does....

Please enlighten me.

It's hard to understand what you're asking. If you build a car, you won't get a truck. If you build a truck, you won't get a car. Creating an ArrayList will create an ArrayList, not a Multimap. I suggest you read the javadoc of ArrayListMultimap and ArrayList. — JB Nizet
– JB Nizet, Commented Oct 10, 2013 at 7:28
Yeah, I know that they are used for different purposes (ArrayList,Multimap). What I'd like to ask is can an ArrayList return value like this: [[Color,Fruit],[Pink,Orange]]. Is it possible? Or do i need to use something else to make it possible? — TOMAS DEL CASTILLO
– TOMAS DEL CASTILLO, Commented Oct 10, 2013 at 7:36
An ArrayList doesn't return anything. Its methods return something. It seems you want a list of lists. And yes, of course it's possible. — JB Nizet
– JB Nizet, Commented Oct 10, 2013 at 7:41
I think you hit it right when you said List of list. That's what I'd like to do actually, thanks for mentioning it. — TOMAS DEL CASTILLO
– TOMAS DEL CASTILLO, Commented Oct 10, 2013 at 8:46

smajlo · Accepted Answer · 2013-10-10 07:31:19Z

1

ArrayList its just a simple List http://docs.oracle.com/javase/7/docs/api/java/util/List.html

and ArrayListMultimap is a Multimap http://google-collections.googlecode.com/svn/trunk/javadoc/com/google/common/collect/Multimap.html implementation based on ArrayList.

Basically those two classes provides different api.

answered Oct 10, 2013 at 7:31

smajlo

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