JTable RowSorter order wrong

I imported javax.swing.table.TableRowSorter;

used it in the table model. It works properly with Strings, but with numbers it orders everything in a weird way, as shown in the picture. I'm a noob at coding so I don't really know how to properly google for such an issue yet.

 DefaultTableModel model = new DefaultTableModel();
 table.setAutoCreateRowSorter(true);

Not sure if you still need more code. It is a mess tbh, as object oriented coding came up in school after i started this.

Your problem is that your sorting is doing an alphabetical sort, which works well for String objects, but once you have Integers to sort, you will have the situation that 2 > 19, because alphabetically 2 is after 1.

You will need something like:

DefaultTableModel model = new DefaultTableModel(data,columns) {
    @Override
    public Class getColumnClass(int column) {
        switch (column) {
            case 4: {
                //assuming that the int column you have is in the fourth column
                return Integer.class; 
            } break;
            default:
                return String.class;
        }
    }
};

where data is an Object[][] and columns is an Object[].