Java Program to Find Sum of Two Arrays Elements

How to add two arrays in java – Java Program to Find Sum of Two Arrays Elements

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How to add two arrays in java: In the previous article, we have seen Java Program to Concatenate Two Arrays

In this article we will see how to find sum of two arrays.

Java Program to Find Sum of Two Arrays Elements

Add two arrays java: Array is a data structure which stores a fixed size sequential collection of values of single type. Where with every array elements/values memory location is associated. Each array elements have it’s own index where array index starts from 0.

In Array set of variables referenced by a single variable name and it’s array index position. It is also called as a container object which contains elements of similar type.

Declaration of an array:

dataType[] arrayName; (or)                              //Declaring an array
dataType []arrayName; (or)
dataType arr[];

Instantiation of an Array:

arrayName = new datatype[size];                    //Allocating memory to array

Combining both Statements in One:

dataType[] arrayName = new dataType[size] //Declaring and Instantiating array

Initialization of an Array:

arrayName[index-0]= arrayElement1             //Initializing the array

...

arrayName[index-s]= arrayElementS

Combining all Statements in One:

dataType arrayName[ ]={e1,e2,e3};               //declaration, instantiation and initialization

Let’s see different ways to add elements of two arrays accordingly.

Method-1: Java Program to Find Sum of Two Arrays Elements By Static Initialization of Array Elements

Approach:

  • Take two arrays of similar size with elements.
  • Display both arrays.
  • Create another empty array of the same size.
  • Use a for loop to add the elements and store it in the empty array.
  • Display the array.

Program:

import java.util.*;

public class Main
{
    public static void main(String args[])
    {
        //Original array
        int arr1[] = {12, 22, 34, 22, 54};
        int arr2[] = {29, 54, 98, 87, 2};
        // Printing both arras
        printArray(arr1);
        printArray(arr2);
        int resultantArr[] = new int[arr1.length];
        // Using for loop to add the elements from arr1 and arr2
        for(int i=0;i<arr1.length;i++)
            resultantArr[i] = arr1[i] + arr2[i];
        // Printing the resultant array
        printArray(resultantArr);
        
    }

    // Function to print the array
    static void printArray(int arr[])
    {
        System.out.println("The array elements are");
        for(int i = 0; i < arr.length ; i++)
            System.out.print(arr[i]+" ");
        System.out.println();
    }
}



Output:

The array elements are
12 22 34 22 54 
The array elements are
29 54 98 87 2 
The array elements are
41 76 132 109 56

Method-2: Java Program to Find Sum of Two Arrays Elements By Dynamic Initialization of Array Elements

Approach:

  • Create scanner class object.
  • Ask user for length of the array.
  • Declare two arrays with same size.
  • Ask the user for input array elements for both the arrays.
  • Display both arrays.
  • Create another empty array of the same size.
  • Use a for loop to add the elements and store it in the empty array.
  • Display the array.

Program:

import java.util.*;

public class Main
{
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in); 
        System.out.print("Enter the number of elements in the array: "); 
        int num = sc.nextInt(); 
        //Declaring both the arrays with size 'num'
        int arr1[] = new int[num]; 
        int arr2[] = new int[num]; 
        
        //Taking input of array elements for arr1
        System.out.print("Enter the elements for arr1: "); 
        for (int i = 0; i < num; i++) 
        { 
            arr1[i] = sc.nextInt(); 
        }
        
        //Taking input of array elements for arr1
        System.out.print("Enter the elements for arr2: "); 
        for (int i = 0; i < num; i++) 
        { 
            arr2[i] = sc.nextInt(); 
        }

      
        // Printing both arras
        printArray(arr1);
        printArray(arr2);
        int resultantArr[] = new int[arr1.length];
        // Using for loop to add the elements from arr1 and arr2
        for(int i=0;i<arr1.length;i++)
            resultantArr[i] = arr1[i] + arr2[i];
        // Printing the resultant array
        printArray(resultantArr);
        
    }

    // Function to print the array
    static void printArray(int arr[])
    {
        System.out.println("After adding two arrays the array elements are");
        for(int i = 0; i < arr.length ; i++)
            System.out.print(arr[i]+" ");
        System.out.println();
    }
}



Output:

Enter the number of elements in the array: 6
Enter the elements for arr1: 11 56 23 89 65 81
Enter the elements for arr2: 44 66 95 25 67 19
After adding two arrays the array elements are
11 56 23 89 65 81 
After adding two arrays the array elements are
44 66 95 25 67 19 
After adding two arrays the array elements are
55 122 118 114 132 100

If you are new to Java and want to learn the java coding skills too fast. Try practicing the core java programs with the help of the Java basic programs list available.

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