Dynamic and multi-dimensional array in Java?

[Afrow UK]

I've tried an ArrayList, and it's dynamic, but I can't make it multi-dimensional!

Is it possible to have an array of 2 dimensions that has the first dimension dynamic?
e.g. [x][0], [x][1] etc

-Stu

[shmoove]

You could store arrays in the ArrayList, or make an array of ArrayLists (depending on which dimension needs to be dynamic).

shmoove

[Afrow UK]

Yeh I would if I knew how...

-Stu

[KeZZeR]

Are you dynamically trying to initialise the array?

[cfc]

When it comes to specific class use, the API specs are your best friend. Java is extremely well-documented, given that you know what you're looking for. I linked to the Java 1.5 documentation, but you can replace the 1.5.0 in the url with whatever version you're using (ie. 1.4.2).

What's with all the <E> and <T> stuff in the Collections framework now? I couldn't help but notice that ArrayList.get(int index) now returns something with a class of E and ArrayList.add() takes an argument of class E. Also, ArrayList.toArray() returns an array of objects with class T

[shmoove]

Originally Posted by cfc

When it comes to specific class use, the
What's with all the <E> and <T> stuff in the Collections framework now?

Generics (like templates in C++).

shmoove

[cfc]

Thanks, I found something on it -- http://www-106.ibm.com/developerwork...-djc02113.html

It's pretty interesting

[Afrow UK]

Thanks all.
Here is another question. What is the easiest or quickest way to convert a negative integer to a positive integer?

-Stu

[cfc]

if (x < 0) 
    x *= -1;

?