I have to write an applet that asks the user to enter two floating-point numbers, obtains the two numbers from the user and draws their sum, product, difference and quotient. This is what I have so far. Can anyone make sure I am on the right track.
import java.awt.Graphics; // program uses class Graphics
import javax.swing.JApplet; // program uses class JApplet
import javax.swing.JOptionPane; // program uses class JOptionPane
public class AdditionApplet extends JApplet
{
private double sum; // sum of values entered by user
// initialize applet by obtaining values from user
public void init()
{
String firstNumber; // first string entered by user
String secondNumber; // second string entered by user
double number1; // first number to add
double number2; // second number to add
// obtain first number from user
firstNumber = JOptionPane.showInputDialog(
"Enter first floating-point value" );
// obtain second number from user
secondNumber = JOptionPane.showInputDialog(
"Enter second floating-point value" );
// convert numbers from type String to type double
number1 = Double.parseDouble( firstNumber );
number2 = Double.parseDouble( secondNumber );
sum = number1 + number2; // add numbers
product = number1 * number2; // multiply numbers
difference = number1 - number2; // subtract numbers
quotient = number1 / number2; // divide numbers
} // end method init
// draw results in a rectangle on applet’s background
public void paint( Graphics g )
{
super.paint( g ); // call superclass version of method paint
// draw rectangle starting from (15, 10) that is 270
// pixels wide and 20 pixels tall
g.drawRect( 15, 10, 270, 20 );
// draw results as a String at (25, 25)
g.drawString( "The sum is " + sum, 25, 25 );
} // end method paint
} // end class AdditionApplet
