子类foo扩展了JTable。 TableModelListener.getSource返回JTable而不是foo

Question

Hopefully a simple question but I am struggling with inheritance.

The ultimate goal is to detect when a cell is changed in a JTable and then run an action that involves getting an extra specific property associated with the table.

I have a class that extends JTable, so that I can add some extra properties to the table. The point of extending JTable is so that when a TableModelListener is activated I can get at the extra properties.

public class dataTable extends JTable implements TableModelListener{

private final PowerpointTable extraProperty;

public dataTable(String[][] tableArray, String[] colNames, PowerpointTable extraProperty) {
    super(tableArray, colNames);
    this.extraProperty= extraProperty;

    }

    public PowerpointTable  getExtraProperty() {
        return this.extraProperty;
    }
}

I would then like to treat this class like a JTable and in another class create the table and add an table listener that fires when the cells are changed.

public secondClass {

     public secondClass() {}

     public void createTable() {
         dataTable newdataTable= new dataTable(tableArray, columnNames, currentTable);
         newdataTable.getModel().addTableModelListener(new TableModelListener() {

         @Override
         public void tableChanged(TableModelEvent tme) {
               PowerpointTable pptT = tme.getSource().getExtraProperty;
         });
}

however getSource only returns a JTable which cannot be cast to a dataTable.

Please let me know how I can access this property or if there is a better way to implement this functionality.

Answer 1

Solved it,

as rdonuk pointed out, getSource returns a TableModel,

I therefore changed the first class to extend a DefaultTableModel and added the extra property.

public class TryingTableModel extends DefaultTableModel {

public TryingTableModel(PowerpointTable pptRef, Object[][] os, Object[] os1) {
    super(os, os1);
    this.pptRef = pptRef;
}

private final PowerpointTable pptRef;

public PowerpointTable getPPTTable() {
    return this.pptRef;
}

public String testAccess() {
    return "it worked";
}

The JTable is now initialised in the second class

TryingTableModel tableModel = new TryingTableModel(currentTable, tableArray, columnNames);
tableModel.addTableModelListener(new TableModelListener() {

    @Override
    public void tableChanged(TableModelEvent tme) {
    TryingTableModel tableModel = (TryingTableModel) tme.getSource();
    System.out.println(tableModel.testAccess());
    }
});

JTable newJTable = new JTable(tableModel);