# Java Source code example: How to Add Numbers in an Array using For Loop

Updated on October 31, 2013

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This is a Java source code on how to add numbers inside an array using for loop version, this program has also another version on how to add numbers in an array using recursion, if you want to see it too, here is the link to view the page..

In comparison of the other version, you would discover that adding numbers inside an array using for loop is easier to understand and the code is easy to trace. Although both of them has its own advantages, it is really important to know the depth of recursion for other complicated program can only be easily solved using recursion and much complicated on for loop, the best example is the tower of hanoi, it was program using recursion. So, to know how recursion works you can surf my other program which uses recursion, Below is the java source code on adding numbers in an array using for loop.

Java Source code: How to Add Numbers inside an Array using For Loop

```//main class

import java.util.Scanner;

public class Main
{

public static void main(String[] args)
{
Scanner input = new Scanner(System.in);
System.out.print("Enter the size of the input you want to enter: ");
int size = input.nextInt();
int[] numArr = new int[size];
int sum=0;

System.out.print("Enter "+ size +" numbers: ");

for(int i=0; i<numArr.length; i++)
{
numArr[i]=input.nextInt();
sum = sum + numArr[i];
}

System.out.print("The sum of the numbers is: " + sum);
}
}
```

Sample Output:

Enter the size of the input you want to enter: 5

Enter 5 numbers: 34 2 5 3 6

The sum of the numbers is: 50

If you want to make a method and segregate the implementation of sum for the sake of practice in Object Oriented Programming, just simply code it this way.

```//java class

public class ArraySum
{
public int sumOfArray(int[] array)
{
int sum = 0;
for(int i=0; i<array.length; i++)
{
sum = sum + array[i];
}

return sum;
}
}

//main class

import java.util.Scanner;

public class Main
{

public static void main(String[] args)
{
Scanner input = new Scanner(System.in);
System.out.print("Enter the size of the input you want to enter: ");
int size = input.nextInt();
int[] numArr = new int[size];

System.out.print("Enter "+ size +" numbers: ");
for(int i=0; i<numArr.length; i++)
{
numArr[i]=input.nextInt();

}

ArraySum access = new ArraySum();
System.out.print("The sum of the numbers is:" + access.sumOfArray(numArr));

}
}
```

Here is the sample output for the code above.

Sample Output:

Enter the size of the input you want to enter: 5

Enter 5 numbers: 2 5 3 7 25

The sum of the numbers is:42

## Popular

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• ### Programming in Java Netbeans - A Step by Step Tutorial for Beginners: Lesson 41

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• sloka

6 years ago

can v use 'println' instead of 'print'?

• versatile-citizen

7 years ago

Nice. Easy for a beginner to grasp.

• AUTHOR

Rasna Aisha

7 years ago from Manila, Philippines

Hello atz,

Thanks for your kind comment. Comment like that inspires me...:)

• AUTHOR

Rasna Aisha

7 years ago from Manila, Philippines

Hi rollybantilan,

Sorry for the so late reply, I am busy lately on my own website, but I will put my whole attention now here, just wait for my other tutorials, they are on the way. I am planning to redesign all my tutorials here so that it would be more useful and understandable and funny too :) thank you for your continues interest. Happy programming.

• Athul M R

7 years ago from Calicut, Kerala, INDIA

Simple and easy to understand, thanks =)

• rollybantilan

7 years ago

can you teach a program in variable and sum

• AUTHOR

Rasna Aisha

8 years ago from Manila, Philippines

I know how hard it is to have a lack of comparison in codes, for beginners in java and other programming languages, the more you have the example codes available for comparison, the more you gain understanding about the certain programming language. Glad it helps :)

Happy programming swati.g

• swati.g

8 years ago

thank u soo much for clearing my dout....

• charissa remol

8 years ago

T.Y John pitt

• AUTHOR

Rasna Aisha

8 years ago from Manila, Philippines

Thanks John Pitt :)

working