Sum program in java

Sum of Array in Java

Sum of Array in Java | Array Programs in Java – 5 | In the previous Java program, we have seen the different ways to print an array in Java. In this post, we will write a program to find the sum of an array in Java | Sum of Array Elements in Java | Array Addition in Java |

Program Description:- Write a Java program to find the sum of array elements in Java.

Examples of the sum of array elements. Assume we have a given array,

array [] =
Sum of array elements = 10+20+30 = 60

Similarly,
array [] =
Sum of array elements = 50+60-20+55-90 = 55

Procedure to find the sum of array elements,
1) Take one array.
2) Declare one sum variable and initialize it with 0.
3) Using a loop, Iterate through the elements of the given array.
4) Add element to the sum variable and assign result value back to the sum variable. (i.e. sum = sum + arr [i] )
5) When all elements of the array are added to the sum variable then display the result.

Now, let us see the array addition in Java and display the result. First, we will develop a program by hardcoding the values, and again we develop another Java program to take array input from the end-user and then find the sum of array elements. To iterate through the array elements, you can use the length property of the array.

Java program to calculate the sum of array elements

public class ArraySum < public static void main(String[] args) < // declare array and // initialize it with values int array[] = ; // initialize sum variable with 0 int sum = 0; // add array elements for (int i=0; i // display the result System.out.println("Sum of array elements= " + sum); > >

Sum of array elements= 150

In the previous program we have hardcoded the values, now let us develop another Java program to solve the same problem but take input values from the end-user.

Java Program To Calculate The Sum Of Array Elements By Taking Input Values

import java.util.Scanner; public class ArraySum < public static void main(String[] args) < // create Scanner class object Scanner scan = new Scanner(System.in); // take size of array System.out.print("Enter number of elements: "); int number = scan.nextInt(); // declare array with given size int array[] = new int[number]; // take input for array elements System.out.println("Enter array elements: "); for (int i=0; i// initialize sum variable with 0 int sum = 0; // add array elements to sum for (int i=0; i // display the result System.out.println("Sum of array elements= " + sum); > >

Output for the different test-cases:-

Enter number of elements: 5
Enter array elements:
10 20 30 40 50
Sum of array elements= 150

Enter number of elements: 3
Enter array elements:
150 -100 120
Sum of array elements= 170

In the above program, instead of the array.length you can also use numbers variable because both hold the same value. For simplicity, we are using the Scanner class to take input you can also use BufferReader class. To iterate through the loop we can also use a for-each loop rather than a simple for loop.

// for-each loop for (int i : list) < // add array elements to sum sum += i; >

Limitation of the above program:- the number of array elements must be known at the program development time. If the number of array elements is dynamic and can’t be predicted before then we must take the help of collection classes because they can grow dynamically.

import java.util.List; import java.util.ArrayList; public class ArraySum < public static void main(String[] args) < // declare list Listlist = new ArrayList(); // add elements to the list // you can take input from the end-user list.add(10); list.add(20); list.add(30); list.add(40); list.add(50); // initialize sum variable with 0 int sum = 0; // add array elements to sum for (int i : list) < sum += i; >// display the result System.out.println("Sum = " + sum); > >

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Sum program in java

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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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How to Find the Sum of Two Numbers in Java

wikiHow is a “wiki,” similar to Wikipedia, which means that many of our articles are co-written by multiple authors. To create this article, volunteer authors worked to edit and improve it over time.

This article has been viewed 205,440 times.

Finding the sum of two numbers is simple, but it can get tedious if the numbers are big. Here is how you can create a Java program to find the sum of two numbers.

Plan your program. Finding the sum of two numbers isn’t difficult, but it is always a good practice to plan your program before beginning to code. Understand that you’d need two inputs/ parameters from the user for this program: the two numbers.

• Create a separate variable to store the value of the sum. This can be of the type int.
• The formula to find the sum is:

Display the output. Once the program has calculated the sum, display it to the user. Use the System.out.print or System.out.println (to print on a new line) function, in Java, for this. [2] X Research source

Community Q&A

Can the volume of a cuboid, cylinder, and cone be calculated by a switch statement taking suitable variables and data types?

Yes. You may want to have the user specify what kind of shape before taking in any other input (such as dimensions).

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Assume there are three integers (a, b, c): int a = 46; int b = 56; int c = a + b; System.out.println(c); Don’t forget the semicolons.

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mScanner.nextInt(); sum = firstNumber + secondNumber; System.out.println("The sum of the two numbers you entered o">+ sum); > > 

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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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