Update JTable from String[][]

Question

Hello everyone, I have a JTable with a slightly customized DefaultTableModel shown below:
DefaultTableModel tableModel = new DefaultTableModel(rowData, columnNames){
     private static final long serialVersionUID = 8655602888381735851L;
     @Override
         public boolean isCellEditable(int row, int column)
                     return false;
          };rowData is a String[][] of my data. When a user clicks a button, they add a row of data to the String[][]. I am wondering how I can update the JTable to reflect this change in the String[][]. Thanks!

Answer 1

The problem with that is that I'm going to be performing various searches through the data, and those searches are performed on a TreeMap.
rowData gets its data from the TreeMap, and is then displayedThe active verb does not describe the situation accurately: according to your code, rowdata is merely built from the TreeMap instance, and stuffed into a DefaultTableModel for display.
When the user adds data, they add it to the TreeMap so that it can be searched.
I can easily convert the data from the TreeMap to the String[][], but I don't know how to "redraw" the table with the new data.I assume the data is too big to repeat the process each time the user adds a row (build the new String[][], wrap it into a new DefaultTableModel instance and set the instance as the table's model).
Another way is to duplicate the structure: when the user adds a row, add it into the searchable collection, and into the table model. But this costs twice the memory, and, again, I assume your data set is too large.
A third, probably more elegant way is to build your own TableModel implementation: it could store a reference to the TreeMap instance, and an array converting the table's row index values to the tree's key value. That way the table model can be described in the active mode:
"the JTable asks the model for cell values, and the model asks the tree for the corresponding data" :o)