java程序报错有关问题

package ch8;import javax.swing.table.AbstractTableModel;import javax.swing.*;import java.awt.*;import java.awt.event.*;public class TableModel1{         public TableModel1() {           JFrame f = new JFrame();       MyTable mt=new MyTable();       JTable t=new JTable(mt);       t.setPreferredScrollableViewportSize(new Dimension(550, 30));        JScrollPane s = new JScrollPane(t);        f.getContentPane().add(s, BorderLayout.CENTER);               f.setTitle("JTable1");        f.pack();        f.setVisible(true);                f.addWindowListener(new WindowAdapter() {            public void windowClosing(WindowEvent e) {                System.exit(0);            }        });    }    public static void main(String args[]) {            new TableModel1();    }}class MyTable extends AbstractTableModel{    Object[][] p = {        {"阿呆", new Integer(66),           new Integer(32), new Integer(98), new Boolean(false),new Boolean(false)},        {"阿瓜", new Integer(85),           new Integer(69), new Integer(154), new Boolean(true),new Boolean(false)},              };    String[] n = {"姓名","语文","数学","总分","及格","作弊"};    public int getColumnCount() {        return n.length;    }    public int getRowCount() {        return p.length;    }    public Object getValueAt(int row, int col) {        return p[row][col];    }}