JTable causing ArrayIndexOutOfBounds exception

I created the JTable like this
int allRows = I calculate this before I create the below object
int allCols = 5 which is constant
Object colNames [ ] = {pkg1,pkg2,pkg3,pkg4,pkg5};
Object [ ][ ] obj= new Object[allRows][allCols];
then I start inserting rows in obj by
obj[rows][1] = ....
obj[rows][2] = ....
obj[rows][3] = ...
obj[rows][4] = ...
obj[rows][5] = ...
Then I create the Jtable
new JTable(obj,colNames);
But when I add the rows to obj[ ] [ ] the no of rows might exceed the allrows value. So I am not able to change the value for allRows once it is created.
Is there anyway I can increase the no of rows in obj before inserting values.
I would appreciate If some one could help me out in this.
Thanks
Sushma.

Here's a simple example for increasing the size of an array:
final int TOTAL_ELEMENTS = 5;
final int ADD_ELEMENTS = 3;
int[] myArray = new int[TOTAL_ELEMENTS];
for (int j = 0; j < TOTAL_ELEMENTS; j++)
{  myArray[j] = j;  }
int[] tempArray = new int[TOTAL_ELEMENTS + ADD_ELEMENTS];
for (int j = 0; j < TOTAL_ELEMENTS; j++)
{  tempArray[j] = myArray[j];  }
myArray = tempArray;
// Positions from TOTAL_ELEMENTS to
//(TOTAL_ELEMENTS + ADD_ELEMENTS - 1) are not
//set, but they now exist.
tempArray = null;Of course, this is working with a simpler array than the one you're using, but, basically what you do is:
1. Create a new (temporary) array with the new amount of elements you need.
2. Copy each element from the smaller array into the new, larger array.
3. Set the old array equal to the new array.
4. Set the new array to null and forget about it.
5. All the old elements are in their original places and you have a new array with more elements.
Of course, this is pretty slow if you do it with large arrays or often, so it may not be the best idea.

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