How to create a array with variables dimensions?

I try to create a array like that:
Object[][] data;
data = new Object[] [];
But that's doesn't work!
Apparently I must specify the dimension of my array
So I have done like that :
Object[][] data;
data = new Object[3] [3];
And that work!
But the problem is when I need to add extra elements to my array.
If I write :
data[4][1] = "123";
I have the error message :
java.lang.ArrayIndexOutOfBoundsException
So, how can I defined a array with variables dimensions OR how can I add a dimension to a array?

if you have:
Object[][] data;
data = new Object[3] [3];you end yo getting ArrayIndexOutOfBoundException if you try to point to some other Indexes. You can increase the size by doing new:
Object[][] data;
data = new Object[4] [3];and then copy the old Arrays to this one... this is heavy.
Other thing to consider then is using some other datastructure, such as Vector, which grows along you add elements to it.
P_trg

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