Updating a JTable with an array of values

Question

Ther is a constructor that allows for the cretion of the table with an iniital array of values. However subsequent updates of blocks of data- say you received an array of updated data form a database- reuiqre you to update ince cell at a time. Is ther any way fo updating a whole block at once. I should point out that I am asking this because I am using JTables in the Matlab programming environment where arrays are the basic unit and looping through is a comparatively slow process

Answer 1

Yes, you can extend the AbstractTableModel and write a method for updating a whole block.
lets say you've got a Vector with Float[] arrays as elements to hold a 2D array of Float. The you could write:
      TableModel dataModel = new AbstractTableModel() {
            public int getColumnCount() { return col_names.size(); }
            public int getRowCount() { return data.size();}
            public Object getValueAt(int row, int col) {
               return ((Float)((Float[])data.elementAt(row))[col]).toString();
            public String getColumnName(int col) {
             return ((String)col_names.elementAt(col));
            public Class getColumnClass(int col) {
             return String.class;
            public boolean isCellEditable(int row, int col) {
              return true;
            public void setValueAt(Object aValue, int row, int col) {
               try {
                 Float fv = Float.valueOf((String)aValue);
                ((Float[])data.elementAt(row))[col] = fv;
               } catch (Exception ex) {
            public void setBlock(Float block[][], int row, int col) {
               // copy the Arrays with System.arrayCopy into data
      };PS: I don't know, if the above is correct written, havn't test this. But I hope you can recognize the idea behind it.
wami