import javax.swing.*;
import javax.swing.table.*;

public class Main {
    public void start() {
        JFrame.setDefaultLookAndFeelDecorated(true);
        JFrame frame = new JFrame("Test");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        JTable table = new JTable(new TestTableModel());
        
        frame.add(table);
        
        frame.pack();
        frame.setVisible(true);
        
        return;
    }
    
    private class TestTableModel extends AbstractTableModel {
        public Object getValueAt(int rowIndex, int columnIndex) {
            return rowIndex * columnIndex;
        }
        
        public int getColumnCount() {
            return 7;
        }
        
        public int getRowCount() {
            return 7;
        }
    }

    public static void main(String[] args) {
        new Main().start();
    }
}