Creating a Table 
A table fires change events when the contents of one of its cells is modified. 

 
 Object[][] cellData = {
     {"row1-col1", "row1-col2"},
     {"row2-col1", "row2-col2"}};
 String[] columnNames = {"col1", "col2"};
     
 JTable table = new JTable(cellData, columnNames);
 // The next two lines should be in one line.
 table.getModel().addTableModelListener(
   new MyTableChangedListener());
     
 // Make the table scrollable.
 JScrollPane scrollPane = new JScrollPane(table);
     
 // The next two lines should be in one line.
 class MyTableChangedListener
    implements TableModelListener {
     public void tableChanged(TableModelEvent evt) {
        int row = evt.getFirstRow();
        int column = evt.getColumn();
        // The next three lines should all be in one line.
        Object data =
          ((TableModel)evt.getSource()).getValueAt(
            row, column);
     
         process(data);
     }
  }