问答题

本程序中，用表格来表现某个月的月历，其中标题是从Sunday到Saturday，表格中的各项是可以修改的，如图所示。


import java. awt.*;
import java.awt.event.*;
import javax.swing. *;
import j avax. swing, table. *;
public class exam_60
{
public static void main(String[] args)
{
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}
catch (Exception e) { }
JFrame frame=new CalendarTableFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.show();
}
}
class CalendarTableFrame extends JFrame
{
private static final int WIDTH=500;
private static final int HEIGHT=I50;
private ______ cells =
{
{ null, null, null, new Integer(1), new Integer(2), new Integer(3), new
Integer(4) },
{ new Integer(5), new Integer(6), new Integer(7), new Integer(8), new
Integer(9), new Integer(10), new Integer(11) },
{ new Integer(12), new Integer(13), new Integer(14), new Integer(15), new
Integer(16), new Integer(17), new Integer(18) },
{ new Integer(19), new Integer(20), new Integer(21), new Integer(22), new
Integer(23), new Integer(24), new Integer(25) },
{ new Integer(26), new Integer(27), new Integer(28), new Integer(29), new
Integer(30), new Integer(31), null }
};
private String[] columnNames={
"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday",
"Saturday"
};
public CalendarTableFrame () {
setTitle("exam_60");
setSize(WIDTH, HEIGHT);
JTable table=new ______;
getContentPane() .add(new JScrollPane(table),
BorderLayout. CENTER);
}
}