Add Two Numbers in Java

In this section, you will learn to work with command prompt arguments provided by the user. We will access these arguments and print the addition of those numbers. In this example, args is an array of String objects that takes values provided in command prompt. These passed arguments are of String types so these can't be added as numbers. So to add, you have to convert these Strings in numeric type (int, in this example). Integer.parseInt helps you to convert the String type value into integer type. Now you can add these values into a sum variable and print it on the console by println() function.

Here is the code of program:


public class AddNumbers{

  public static void main(String[] args) {

    System.out.println("Addition of two numbers!");

    int a = Integer.parseInt(args[0]);

    int b = Integer.parseInt(args[1]);

    int sum = a + b;

    System.out.println("Sum: " + sum);

  }

}

Output of program:

C:\vinod>javac AddNumbers.java

C:\vinod>java AddNumbers 12 20
Addition of two numbers!
Sum: 32

Current Comments

11 comments so far (post your own) View All Comments Latest 10 Comments:

It was simple and clear and explanatory.

Posted by Sann on Monday, 04.6.09 @ 19:50pm | #86563

View This Comment Separately

A very very good website for learning any technology.

I want to appreciate every one in your team whole heartly for their extra-ordinary work.

Keep up the good work.

Posted by G Ravi Kumar on Saturday, 04.4.09 @ 12:09pm | #86494

View This Comment Separately

public class AddNumbers{
public static void main(String[] args) {
System.out.println("Addition of two numbers!");
int a = Integer.parseInt(args[0]);
int b = Integer.parseInt(args[1]);
int sum = a + b;
System.out.println("Sum: " + sum);
}
}

Posted by harish on Thursday, 12.4.08 @ 00:58am | #82356

View This Comment Separately

your programm is very fine.

Posted by bhism pratap singh on Monday, 10.6.08 @ 11:22am | #80919

View This Comment Separately

Addition of two numbers!
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
at addnumbers.main(addnumbers.java:4)

why do that ,,must print the sum when add two number

Posted by bolbol on Monday, 09.22.08 @ 15:05pm | #80597

View This Comment Separately

Hii, cant we just pass a numeric array ?

like public static void main (int[] numarry)
.........
....
...
...
}

Posted by Jengo on Tuesday, 06.3.08 @ 13:17pm | #61935

View This Comment Separately

public static void main(String[] args) {
int a = 5;
int b = 7;
System.out.println("Addition of two numbers!");
int sum = a + b ;
System.out.print("Sum is: "+sum);
}
}

Posted by khalid on Tuesday, 03.11.08 @ 14:55pm | #52283

View This Comment Separately

it happens wen u havent passed the arguments..

at run time,entere like java AddNumbers 10 20 and not just javaAddNumbers

Posted by Anand on Wednesday, 11.28.07 @ 16:35pm | #40828

View This Comment Separately

arter compiling o/p is error: cannot read: Add.java
and at run time:
Exception in thread "main" java.lang.NoClassDefFoundError: Add

Posted by srinivas on Saturday, 10.20.07 @ 15:37pm | #34447

View This Comment Separately

Using jdk 1.6 this code returns.

Addition of two numbers!
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
at addnumbers.main(addnumbers.java:4)

Posted by Leadgolem on Saturday, 06.9.07 @ 11:00am | #18695

View This Comment Separately