methods in tablemodel not exposed?

Any idea why the doThis() method in this table model would not be
available?

When I try to compile, I get this error:
"cannot find symbol symbol : method doThis()
location: class javax.swing.JTable
                t.doThis();"

(This is a cut and snip code sample from a larger project. Ignore all of
the bad imports unless it would affect it.)

import javax.swing.text.*;
import javax.swing.*;
import java.awt.*;
import java.lang.Exception.*;
import java.awt.event.*;
import javax.swing.table.*;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import java.io.*;
import java.util.*;
import java.text.*;

public class nsProject extends JFrame implements ActionListener
{

    //the table - so I can swap data
    JTable t = new JTable(new MyTableModel());

    public class nsRecord {
        public String recNum = null;
        public String firstName = null;
        public String lastName = null;
        public String state = null;
        public String strain = null;
        public String newRecNum = null;
        public String source = null;
    }

    class MyTableModel extends AbstractTableModel {

        //assigning column names
        private String[] columnNames = {"Record Number",
                                        "First Name",
                                        "Last Name",
                                        "State",
                                        "Strain",
                                        "Source"};

        private ArrayList datalist = new ArrayList();

        //constructor one
        public MyTableModel() {
        }

        //constructor two
        public MyTableModel(ArrayList l) {
            datalist.addAll(l);
        }

        public void doThis() {
        }

        public int changeAll(ArrayList l) {
            datalist.clear();
            datalist.addAll(l);
            fireTableDataChanged();
            return 0;
        }

        public void addOneRec(nsRecord nsRec) {
            datalist.add(nsRec);
            fireTableDataChanged();
        }

        public nsRecord getRecordAt(int row) {
            return (nsRecord)datalist.get(row);
        }

        public int getColumnCount() {
            return columnNames.length;
        }

        public int getRowCount() {
            return datalist.size();
        }

        public String getColumnName(int col) {
            return columnNames[col];
        }

        public Object getValueAt(int row, int col) {
            nsRecord rec = (nsRecord) datalist.get(row);
            switch (col) {
                case 0:
                    return rec.recNum;
                case 1:
                    return rec.firstName;
                case 2:
                    return rec.lastName;
                case 3:
                    return rec.state;
                case 4:
                    return rec.strain;
                case 5:
                    return rec.source;
                default:
                    return null;
            }
        }
     }

    public void actionPerformed(ActionEvent e)
    {
        String arg = e.getActionCommand();
        int intResult = 0;

        if (arg == "Open") {
            //add data to table
            t.doThis();
        }
     }
}