Method sum in java

How to find sum of array elements in java

Sum of array elements means the sum of all the elements(or digits) in the array. Array elements can be integers( int ) or decimal numbers( float or double ).
There are different methods to calculate sum of elements in an array in java and this post discusses them all.

Method 1 : Using for loop
This is a traditional and most commonly used approach where the array is iterated using a for loop.
In each iteration, the current array element is added to a variable which holds the sum of array elements.
This variable is initialized to 0 before the start of loop. Example,

public class ArraySumCalculator { public static void main(String[] args) { int[] array = { 1, 34, 67, 23, -2, 18 }; // variable to hold sum of array elements int sum = 0; // iterate using a for loop for (int loopCounter = 0; loopCounter < array.length; loopCounter++) { // get current array element int element = array[loopCounter]; // add element to sum sum += element; } System.out.println("Sum of array elements is: " + sum); } }

public class ArraySumCalculator < public static void main(String[] args) < int[] array = < 1, 34, 67, 23, -2, 18 >; // variable to hold sum of array elements int sum = 0; // iterate using a for loop for (int loopCounter = 0; loopCounter < array.length; loopCounter++) < // get current array element int element = array[loopCounter]; // add element to sum sum += element; >System.out.println(«Sum of array elements is: » + sum); > >

Sum of array elements is: 141

for loop in this program can also be replaced with a for-each loop as shown below.

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Method sum in java

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Get the Sum of an Array in Java

1. Find the Sum of an Array by Using a for Loop in Java
2. Find the Sum of an Array by Using the Stream Method in Java
3. Find the Sum of an Array by Using the reduce Method in Java
4. Find the Sum of an Array by Using the sum Method in Java
5. Find the Sum of an Array by Using the IntStream Interface in Java
6. Find the Sum of an Array by Using a Compact for Loop in Java

This tutorial introduces how to find the sum of an array in Java also lists some example codes to understand the topic.

An array is defined as a collection of similar types of elements in Java. In this article, we’ll find the sum of array elements by using some built-in methods and custom codes.

Performing this operation is very common during programming. Unfortunately, Java does not provide any specific method to get the sum of an array. So, we will use some tricks to solve this issue!

Find the Sum of an Array by Using a for Loop in Java

In this example, we used a loop to traverse each array element and get thir sum parallel. This method has a simple code that requires a single loop to get the sum. Here’s the example program:

public class SimpleTesting  public static void main(String[] args)   int arr[] = new int[] 12,34,45,21,33,4>;  int sum = 0;  for (int i = 0; i  arr.length; i++)   sum+=arr[i];  >  System.out.println("Array Sum = "+sum);   > > 

Find the Sum of an Array by Using the Stream Method in Java

In this example, we used the stream() method of the Arrays class and the parallel() method to get the sum of the array elements. We passed the lambda expression to the reduce() method that actually does the sum operation. See the example below:

import java.util.Arrays; public class SimpleTesting  public static void main(String[] args)   int arr[] = new int[] 12,34,45,21,33,4>;  int sum = Arrays.stream(arr).parallel().reduce(0,(a,b)-> a + b);  System.out.println("Array Sum = "+sum);   > > 

Find the Sum of an Array by Using the reduce Method in Java

In this example, we used the reduced() method directly with the stream of arrays and get the sum of the elements. Here’s how to do it:

import java.util.Arrays; public class SimpleTesting  public static void main(String[] args)   int arr[] = new int[] 12,34,45,21,33,4>;  int sum = Arrays.stream(arr).reduce(0,(a,b)-> a + b);  System.out.println("Array Sum = "+sum);   > > 

Find the Sum of an Array by Using the sum Method in Java

Java provides the sum() method in the Stream API to get a sum of stream sequences. Here, we passed an array to the stream and got its sum by using the sum() method. See the example below:

import java.util.Arrays; public class SimpleTesting  public static void main(String[] args)   int arr[] = new int[] 12,34,45,21,33,4>;  int sum = Arrays.stream(arr).sum();  System.out.println("Array Sum = "+sum);  > > 

Find the Sum of an Array by Using the IntStream Interface in Java

This method is another solution where you can use the Intsream interface to create a stream of array elements and utilize the sum() method to get the sum in a straightforward, single-line solution. Follow the sample code here:

import java.util.stream.IntStream; public class SimpleTesting  public static void main(String[] args)   int arr[] = new int[] 12,34,45,21,33,4>;  int sum = IntStream.of(arr).sum();  System.out.println("Array Sum = "+sum);  > > 

Find the Sum of an Array by Using a Compact for Loop in Java

In this example, we used a for loop to get the sum of array elements with an additional unique process. Here, rather than creating a loop body, we just bind up into the loop signature part. We can call it a compact loop solution. You can try it if you’re not afraid of a messy code block.

public class SimpleTesting  public static void main(String[] args)   int arr[] = new int[] 12,34,45,21,33,4>;  int sum,i;  for(sum= 0, i= arr.length - 1; 0  i; sum+= arr[i--]);  System.out.println("Array Sum = "+sum);  > > 

Related Article — Java Array

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Java method to sum any number of ints

If your using Java8 you can use the IntStream:

int[] listOfNumbers = ; System.out.println(IntStream.of(listOfNumbers).sum()); 

Just 1 line of code which will sum the array.

public int sumAll(int. numbers) < int result = 0; for(int i = 0 ; i < numbers.length; i++) < result += numbers[i]; >return result; > 

Then call the method and give it as many int values as you need:

int result = sumAll(1,4,6,3,5,393,4,5);//. System.out.println(result); 

public int sumAll(int. nums) < //var-args to let the caller pass an arbitrary number of int int sum = 0; //start with 0 for(int n : nums) < //this won't execute if no argument is passed sum += n; // this will repeat for all the arguments >return sum; //return the sum > 

public long sum(int. numbers) < if(numbers == null)< return 0L;>long result = 0L; for(int number: numbers) < result += number; >return result; > 

Thank you. Return type had to be int. Does (int. numbers) notation work for other types such as long double and even String?

import java.util.Scanner; public class SumAll < public static void sumAll(int arr[]) System.out.println("Sum is : " + sum); > public static void main(String[] args) < int num; Scanner input = new Scanner(System.in);//create scanner object System.out.print("How many # you want to add : "); num = input.nextInt();//return num from keyboard int[] arr2 = new int[num]; for (int i = 0; i < arr2.length; i++) < System.out.print("Enter Num" + (i + 1) + ": "); arr2[i] = input.nextInt(); >sumAll(arr2); > > 

 public static void main(String args[]) < System.out.println(SumofAll(12,13,14,15));//Insert your number here. < public static int SumofAll(int. sum)//Call this method in main method. int total=0;//Declare a variable which will hold the total value. for(int x:sum) < total+=sum; >return total;//And return the total variable. > > 

You could do, assuming you have an array with value and array length: arrayVal[i] , arrayLength :

int sum = 0; for (int i = 0; i < arrayLength; i++) < sum += arrayVal[i]; >System.out.println("the sum is" + sum); 

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