Map for Vectors

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Marcelo - 30 Jan 2006 10:24 GMT

Just a little question from a begginner,

I would like to know if there is something like a "table" or a matrix of Vectors.

I am actually looking for something similar of a "Vector of Vectors", does Java
has a class that implements this?

thanks a lot,

Marcelo

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Ingo R. Homann - 30 Jan 2006 12:30 GMT

Hi Marcelo,

> Just a little question from a begginner,
>
[quoted text clipped - 3 lines]
> I am actually looking for something similar of a "Vector of Vectors",
> does Java has a class that implements this?

Yes, nearly exactly that:

List<List<MyContentType>> matrix=new ArrayList<List<MyContentType>>();

You may encapsulate this in your own class.

Ciao,
Ingo

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Roedy Green - 30 Jan 2006 12:47 GMT

>I am actually looking for something similar of a "Vector of Vectors", does Java
>has a class that implements this?

You implement it literally with e Vector of Vectors, or more commonly
ArrayList of ArrayLists.

the generics to define the types get rather unwieldy.
e.g.

ArrayList<ArrayList<Dog>> matrix = new ArrayList< ArrayList<Dog>>(
500);
Now you must go and create the inner arraylists and within that the
Dog objects.

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Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

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