// HowToG.java provides a simple AWT GUI example

import java.awt.*;
import java.awt.event.*;

class HowToG implements ActionListener {

  public static void main(String[] args) {

    int count = 3;

    if (args.length > 0)
      count = Integer.parseInt(args[0]);

    HowToG gui = new HowToG(count);
    
  }

  Frame frm;
  Label lab;
  Button btn;
  
  int n;

  public HowToG(int count) {

    n = count;
    
    frm = new Frame("Welcome to the HowToG program");
    lab = new Label("Countdown at " + count, Label.CENTER);
    btn = new Button("Click here to continue");

    btn.addActionListener(this); // no extra object used here
    
    frm.setLayout(new BorderLayout());
    frm.add(lab, "Center");
    frm.add(btn, "South");
    frm.setBounds(200, 100, 400, 200);
    
    frm.setVisible(true);
    
  }

  public void actionPerformed(ActionEvent e) {

    if (--n > 0) {
      lab.setText("Countdown at " + n);
    }
    else {
      frm.dispose();
      System.out.println("Countdown finished");
      System.exit(0);
    }

  }
  
}