import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class CalendarGUI extends JFrame implements ActionListener,
ItemListener, WindowListener {
    
    private Calendar myCalendar;
    private JLabel lblMonth;
    private JLabel lblYear;
    private JComboBox  comboMonth;
    private JTextField txtYear;
    private JPanel pnlData;
    private JButton btnCalc;
    private JTextArea txtAreaMonth;
    
    private  String names [] = { "January",
    "February",
    "March",
    "April",
    "May",
    "June",
    "July",
    "August",
    "September",
    "October",
    "November",
    "December"};
    
    /**
     * Answers a new GUI for use with the Calendar object
     *
     * @param Calendar cal  The model calendar object
     *
     **/
    
    public CalendarGUI(Calendar cal) {
        super("Calendar");
        setSize(450, 275);
        setLocation(200,200);
        myCalendar = cal;
        myCalendar.setMonth("January");
        
        lblMonth      = new JLabel("Month:");
        lblYear       = new JLabel("Year:");
        comboMonth    = new JComboBox(names);
        txtYear       = new JTextField(6);
        btnCalc       = new JButton("Generate");
        pnlData       = new JPanel();
        txtAreaMonth  = new JTextArea();
        
        txtAreaMonth.setFont(new Font("Courier", Font.PLAIN, 16));
        
        
        comboMonth.addItemListener(this);
        
        pnlData.add(lblMonth);
        pnlData.add(comboMonth);
        pnlData.add(lblYear);
        pnlData.add(txtYear);
        pnlData.add(btnCalc);
        
        btnCalc.addActionListener(this);
        
        Container c = getContentPane();
        c.add(pnlData, BorderLayout.NORTH);
        c.add(txtAreaMonth, BorderLayout.CENTER);
        addWindowListener(this);
        setVisible(true);
    }
    
    
    /**
     *  Listen and handle action events
     *
     *  @param ActionEvent e   The event listened for
     *
     **/
    
    public void actionPerformed(ActionEvent e) {
        
        if (e.getSource() == btnCalc) {
            int textfieldyear = Integer.parseInt(txtYear.getText());
            myCalendar.setYear(textfieldyear);
            System.out.println(comboMonth.getSelectedItem());
            txtAreaMonth.setText(myCalendar.monthToString());
        }
    }
    
    /**
     * Listen and handle item event
     *
     * @param ItemEvent e  item (selected from month combo )
     **/
    
    public void itemStateChanged(ItemEvent e) {
        myCalendar.setMonth((String)e.getItem());
    }
    
    /**
     * Listen and handle window events
     * Exits when window is closing.
     *
     * @param  WindowEvent e  the window event
     *
     **/
    
    public void windowClosing(WindowEvent e)     { System.exit(0); }
    public void windowClosed(WindowEvent e)      { };
    public void windowActivated(WindowEvent e)   { };
    public void windowDeactivated(WindowEvent e) { };
    public void windowOpened(WindowEvent e)      { };
    public void windowIconified(WindowEvent e)   { };
    public void windowDeiconified(WindowEvent e) { };
    
    public static void main(String args[]) {
        CalendarGUI cg = new CalendarGUI(new Calendar());
    }
    
}