## Java program to get the sum of even numbers in an array:

*Even numbers* are numbers those are completely divisible by *2*. In this post, we will learn how we can find out the *sum* of all even numbers in an array in Java.

We will write one *Java program* that will take the numbers as inputs from the user, insert them in an *integer array* and finally print out the *total sum* of even numbers.

Below are the steps or algorithm that we will use:

### Algorithm to use:

- Take the
*total count*of numbers from the user. - Create one
*integer array*equal to the value of user-given*count*. - Ask the user to enter the numbers for the array one by one. Read the numbers and insert it in the
*integer array*. - Initialize one
*sum*variable to hold the total sum of all even numbers. Initialize it as*0*. - Run one
*loop*and check for each digit of the array. For each digit, check if it is an*even number*or not. If it is an*even number*, add it to the value of the*sum variable*. So, for each*even number*we will get, the value of*sum*will increase. At the end,*sum*will hold the total sum of*even numbers*in the*array*. - Once the loop ends,
*sum*will hold the*total sum of even*numbers in the array. Print its value.

We can use a *for loop* or *while loop* to solve this problem. In this post, I will show you examples with both *for* and *while* loop.

## Example 1: Find the total sum of even numbers in an array using a for loop in Java:

In this example, we will use a *for loop* to find the total count.

```
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter the size of the array : ");
int size = sc.nextInt();
int[] intArr = new int[size];
System.out.println("Enter the elements of the array separated by space : ");
for (int i = 0; i < size; i++) {
intArr[i] = sc.nextInt();
}
int sum = 0;
for (int i = 0; i < size; i++) {
if (intArr[i] % 2 == 0) {
sum += intArr[i];
}
}
System.out.println("Sum of all even numbers in the array is : " + sum);
}
}
```

Here,

- It asks the user to enter the size of the array and this value is stored in
*size*variable. *intArr*is an integer array of size equal to the*size*that the user entered.- Using a
*for loop*, it reads the elements of the*array*from the user. *sum*variable is initialized as*0*. This is to hold the sum of all even numbers in the array.- Using another
*for loop*, we are iterating through the integer array*intArr*and checking if the current number is*even or not*. If it is, we are adding it to*sum*. - Finally, it prints the calculated
*sum*i.e. sum of all*even numbers*in the array.

It will give output as like below:

```
Enter the size of the array :
5
Enter the elements of the array separated by space :
1 2 3 4 5
Sum of all even numbers in the array is : 6
```

## Example 2: Finding the sum of all even numbers using a while loop:

We can also implement the same program using a *while loop* as like below:

```
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter the size of the array : ");
int size = sc.nextInt();
int[] intArr = new int[size];
System.out.println("Enter the elements of the array separated by space : ");
for (int i = 0; i < size; i++) {
intArr[i] = sc.nextInt();
}
int sum = 0;
int i = 0;
while (i < size) {
if (intArr[i] % 2 == 0) {
sum += intArr[i];
}
i++;
}
System.out.println("Sum of all even numbers in the array is : " + sum);
}
}
```

It will print output similar to the above program.

## Method 3: Finding the sum of even numbers using a different method:

We can put the code that is used to find the *sum* of all *even* numbers in the array in a separate method and call that method from *main*:

```
import java.util.Scanner;
public class Main {
public static int findEvenSum(int[] arr, int size) {
int sum = 0;
int i = 0;
while (i < size) {
if (arr[i] % 2 == 0) {
sum += arr[i];
}
i++;
}
return sum;
}
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter the size of the array : ");
int size = sc.nextInt();
int[] intArr = new int[size];
System.out.println("Enter the elements of the array separated by space : ");
for (int i = 0; i < size; i++) {
intArr[i] = sc.nextInt();
}
System.out.println("Sum of all even numbers in the array is : " + findEvenSum(intArr, size));
}
}
```

Here,

*findEvenSum*method is used to find the sum of all*even*numbers in the array.- It does the same thing. We are using a while loop but you can also use a
*for loop*.

It will print a similar output.

### You might also like:

- Java program to check if the first character of a string is number/digit
- How to get a random line from a file in Java
- How to get the last element of a stream in Java
- Java program to check if a user input number is strong or not
- Java program to find the factors of a number
- Java Program to find the first digit of a positive or negative number