Learning Java Program

import java.awt.*;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
public class StatesAndCapitalsTableDemo extends JPanel 

{
    public static void main(String[] args) 

    {
        JFrame window = new JFrame("Trivial Table Demo");
        StatesAndCapitalsTableDemo content = new StatesAndCapitalsTableDemo();
        window.setContentPane(content);
        window.setSize( new Dimension(350,300) );
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        window.setLocation( (screenSize.width - window.getWidth())/2,
                (screenSize.height - window.getHeight())/2 );
        window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        window.setVisible(true);
    }

    public StatesAndCapitalsTableDemo() 

    {
        String[] columnHeads = new String[] { "State", "Capital City" };
        JTable table = new JTable(statesAndCapitals, columnHeads);
        setLayout(new BorderLayout());
        add( new JScrollPane(table), BorderLayout.CENTER );
    }

    private static String[][] statesAndCapitals = new String[][] 

    {
        { "Alabama", "Montgomery" },
        { "Alaska", "Juneau" },
        { "Arizona", "Phoenix" },
        { "Arkansas", "Little Rock" },
        { "California", "Sacramento" },
        { "Colorado", "Denver" },
        { "Connecticut", "Hartford" },
        { "Delaware", "Dover" },
        { "Florida", "Tallahassee" },
        { "Georgia", "Atlanta" },
        { "Hawaii", "Honolulu" },
        { "Idaho", "Boise" },
        { "Illinois", "Springfield" },
        { "Indiana", "Indianapolis" },
        { "Iowa", "Des Moines" },
        { "Kansas", "Topeka" },
        { "Kentucky", "Frankfort" },
        { "Louisiana", "Baton Rouge" },
        { "Maine", "Augusta" },
        { "Maryland", "Annapolis" },
        { "Massachusetts", "Boston" },
        { "Michigan", "Lansing" },
        { "Minnesota", "St. Paul" },
        { "Mississippi", "Jackson" },
        { "Missouri", "Jefferson City" },
        { "Montana", "Helena" },
        { "Nebraska", "Lincoln" },
        { "Nevada", "Carson City" },
        { "New Hampshire", "Concord" },
        { "New Jersey", "Trenton" },
        { "New Mexico", "Santa Fe" },
        { "New York", "Albany" },
        { "North Carolina", "Raleigh" },
        { "North Dakota", "Bismarck" },
        { "Ohio", "Columbus" },
        { "Oklahoma", "Oklahoma City" },
        { "Oregon", "Salem" },
        { "Pennsylvania", "Harrisburg" },
        { "Rhode Island", "Providence" },
        { "South Carolina", "Columbia" },
        { "South Dakota", "Pierre" },
        { "Tennessee", "Nashville" },
        { "Texas", "Austin" },
        { "Utah", "Salt Lake City" },
        { "Vermont", "Montpelier" },
        { "Virginia", "Richmond" },
        { "Washington", "Olympia" },
        { "West Virginia", "Charleston" },
        { "Wisconsin", "Madison" },
        { "Wyoming", "Cheyenne" }
    };
}