// Find the avarage and the highest grades given a series of scores.
// A GUI implementation.

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

class TA extends JPanel implements ActionListener {

   int grade, sum, number, maxgrade, avarage;
   Label label1, label2;
   TextField input;

   public TA () {

     setLayout (new FlowLayout ());

     sum = 0;
     number = 0;
     maxgrade = -1;
     label1 = new Label ("Teacher's assistant program");
     label2 = new Label ("Enter grade: ");
     input = new TextField (3);

     add (label1);
     add (label2);
     add (input);
     input.addActionListener(this);

     setPreferredSize (new Dimension (250,400));

   }

   public void paintComponent (Graphics g) { 

     super.paintComponent (g);

     if (maxgrade != -1) {
        g.drawString ("The current highest grade is " + maxgrade, 40, 100);
        g.drawString ("The current avarage grade is " + avarage, 40, 130);
        g.drawString ("The number of grades entered is " + number, 40, 160);
     }
     else
        g.drawString ("No grades entered.", 40, 100);

   }

   public void actionPerformed (ActionEvent e) {

     grade = Integer.parseInt(input.getText());
     ++number;
     sum = sum + grade;
     avarage = sum / number; 
     if (grade > maxgrade)
        maxgrade = grade;

     repaint();    

   }
}

class TAGUI {

   public static void main (String[] args) {

   JFrame mywindow = new JFrame ("Teacher Assistant Calculator");
   mywindow.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);


   mywindow.getContentPane().add (new TA ());


   mywindow.pack();
   mywindow.setVisible(true);   

   }
}