Update JTable using a multidimensional array

I've been Googling for an answer for about an hour with no luck, so I thought I would see if anybody has some insight for me...

I have a program, wherein I create a JTable using the constructor that takes a multidimensional array of data and an array of column headings

I.E.:
Object[][] myData = {{"test1", "test1"}, {"test2", "test2"}};
String[] colHeadings = {"Col 1", "Col 2"};
myJTable = new JTable(myData, colHeadings);

The array (myData) contains a list of files from a directory.  What I am trying to accomplish is changing the array and having the changes reflect in the JTable.  Where I am getting stuck is if the new data is longer than the old (array held list of 2 files now has 3 files).

I.E.:
If I do this, JTable displays my changes as I want:
myData[0][0] = "Test Change";
AbstractTableModel myAbsModel= (AbstractTableModel)myJTable.getModel();            myAbsModel.fireTableDataChanged();  //(OR myAbsModel.fireTableRowsUpdated(x, y);  works too

But, if I need to change the size of the array, which will move the reference to a different object, this stops changes from reflecting in myJTable

I.E.: ...This dosen't to work! :-( ...
Object[][] updatedList = getFileList(); // Returns Object[][] of data for files
myData = (Object[][])updatedList.clone();  // Copy new list into Array linked to JTable
myData[0][0] = "Test Change";
AbstractTableModel myAbsModel= (AbstractTableModel)myJTable.getModel();            myAbsModel.fireTableDataChanged();

...Now, hopfully I didn't make something easy sound confusing...

Can anyone suggest a better way to update the data in myJTable with new data from a different array (that could be different size? [More records, no change in #columns]).

Thanks in advance.