Here is the source code for a java applet I have written that calculates any amount of student grades...The applet terminates and calculates the average when you enter -1 :
import javax.swing.*;
import java.awt.Graphics;
import java.text.DecimalFormat;
public class Average5Applet extends JApplet{
int counter = 0;
int total = 0;
int grade;
double average;
public void init()
{
String grades;
grades = JOptionPane.showInputDialog("Enter student grades as integers:");
grade = Integer.parseInt(grades);
while(grade != -1 )
{
counter = counter + 1;
total = total + grade;
grades = JOptionPane.showInputDialog("Enter student grades as integers:");
grade = Integer.parseInt(grades);
}
}
public void paint(Graphics g)
{
super.paint (g);
DecimalFormat twoDigits = new DecimalFormat("0.00");
if ( counter != 0 )
{
average = (double) total / counter;
g.drawString("The average is"+twoDigits.format(average),25,25);
}
else
g.drawString("No grades were entered!!!",25,25);
}
You need to Have JDK 1.6 to compile the applet...
Also you need to execute the applet, write a web page embedding the applet's compiled class file in it....