Adding two Integers in Java Application

This application reads (or inputs) two integers (whole numbers,) typed by a user at the keyboard, computes their sum and displays it. This program

Must keep track of the numbers supplied by the user for the calculation later in the program.

Programs remember numbers and other data in the computer’s memory and access

That data through program elements called variables.

Solution

//Addition program that displays the sum of two numbers.

//Java packages

import javax.swing.JOptionPane; //program uses JOptionPane

public class Addition{

 

  //main method begins execution of java application

  public static void main (String args[])

  {

    String firstNumber; //first string entered by user

    String secondNumber; //second string entered by user

   

    int number1;   //first number to add

    int number2;   //second number to add

    int sum;  //sum of number1 and number2

   

   //read in first number from user as a string

    firstNumber = JOptionPane.showInputDialog("Enter first integer");

   

    //read in second number from user as a string

    secondNumber = JOptionPane.showInputDialog("Enter second interger");

   

    //convert numbers from type string to type int

    number1 = Integer.parseInt(firstNumber);

    number2 = Integer.parseInt(secondNumber);

   

    //add numbers

    sum = number1 + number2;

   

    //display result

    JOptionPane.showMessageDialog(null, "The sum is  " +sum, "Results", JOptionPane.PLAIN_MESSAGE);

   

    System.exit(0);

  }

}