10 simple ways to add two numbers in Java

10 simple ways to add two numbers in Java

In this article, we will discuss the concept of the 10 simple ways to add two numbers in Java

In this post, we are going to learn how to find sum of two number using 10 ways(methods) in Java programming language

Methods to add two numbers

Using simple arithmetic operator

Here, we use a simple “+” operator to find the addition of two numbers

Program 1

// Addition of two numbers in Java 
// Simple Addition using method 
class Additio{ 
    public static void main(String[] args) { 
        int num1=60; 
        int num2=40; 
        System.out.println("sum: "+(num1+num2)); 
        
    } }

When the above code is executed, it produces the following result

sum: 100

 

Using Java method

Here, we use a Java user defined method to find the addition of two numbers

Program 2

// Addition of two numbers in Java
// Simple Addition using method

class AdditionUsingMethod {
    public static void main(String[] args) {
        int num1=12;
        int num2=13;
        System.out.println("sum: "+add(num1,num2));
    }
    public static int add(int a, int b){
        return a+b;
    }
}

When the above code is executed, it produces the following result

sum: 25

 

Using Java method with array

Here, we use a Java user defined method with array to find the addition of two numbers

Program 3

// Addition of two numbers in Java
// Simple Addition using method with array

class AdditionUsingMethod {
    public static void main(String[] args) {
     int num1=15;
        int num2=35;
    int[] result=new int[1];
    add(num1,num2,result);
       
        System.out.println("sum: "+result[0]);
    }
    public static void add(int a, int b, int[] result){
        result[0]=a+b;
    }
}

When the above code is executed, it produces the following result

sum: 50

 

Using Scanner for user input

Here, we use a Java scanner class with user input to find the addition of two numbers

program 4

// Addition of two numbers in Java
// Simple Addition Using Scanner for user input
import java.util.Scanner;
class AdditionUsingMethod {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in); 
        System.out.print("Enter first number: "); 
        int num1=sc.nextInt(); 
        System.out.print("Enter first number: "); 
        int num2=sc.nextInt();
        System.out.println("sum: "+(num1+num2));
    }
  
}

When the above code is executed, it produces the following result

Enter first number: 23
Enter first number: 34
sum: 57

 

Using static method

Here, we use a static method to find the addition of two numbers

program 5

// Addition of two numbers in Java
// Simple Addition using Static method
import java.util.Scanner;
class Static_Addition {
    public static void main(String[] args) {
        int num1=45;
        int num2=55;
        int sum=num1+num2;
        System.out.println("sum: "+add(num1,num2));
        }
        
        public static int add(int a, int b){
        return a+b;
        }}

When the above code is executed, it produces the following result

sum: 100

Using constructor

Here, we use a Java constructor to find the addition of two numbers

program 6

// Addition of two numbers in Java
// Simple Addition using Constructor
import java.util.Scanner;
class Addition_Constructor {
int sum;
    
    Addition_Constructor (int num1, int num2){
    this.sum=num1+num2;
    }
    public static void main(String[] args) {
     int num1=45;
        int num2=55;
    Addition_Constructor add=new Addition_Constructor(num1,num2);
    System.out.println("sum: "+add.sum);
    }
        
        }

When the above code is executed, it produces the following result

sum: 1000

 

Using recursion

Here, we use a recursive method to find the addition of two numbers

program 7

// Addition of two numbers in Java
// Simple Addition using recursion
class Addition_Recursion {
    
    public static void main(String[] args) {
     int num1=35;
        int num2=25;
        int sum=add(num1,num2);
        System.out.println("sum: "+sum);
        }
        //the b is zero , the sum is a
        public static int add(int a, int b){
        if(b==0){
        return a;
        }
        //add one to aand subtract one from b
        return add(a+1,b-1);
        }
        }

When the above code is executed, it produces the following result

sum: 60

 

Using List

program 8

// Addition of two numbers in Java
// Simple Addition using list
import java.util.Arrays;
import java.util.List;
class Addition_List {
    
    public static void main(String[] args) {
     int num1=350;
        int num2=250;
        List<Integer> numbers=Arrays.asList(num1,num2);
        int sum=numbers.get(0)+numbers.get(1);
        System.out.println("sum: "+sum);
        }
        
        }

When the above code is executed, it produces the following result

sum: 600

 

Using Stream

program 9

// Addition of two numbers in Java
// Simple Addition using Stream
import java.util.stream.IntStream;
class Addition_Stream {
    
    public static void main(String[] args) {
     int num1=50;
        int num2=20;
        int sum=IntStream.of(num1,num2).sum();
        System.out.println("sum: "+sum);
        }
        
        }

When the above code is executed, it produces the following result

sum: 70

 

Using Integer.sum method

Here, we use a a pre- defined method (integer.sum) to find the addition of two numbers

program 10

// Addition of two numbers in Java
// Simple Addition using integer.sum method
import java.util.stream.IntStream;
class Addition_IntSum_method {
    
    public static void main(String[] args) {
     int num1=55;
        int num2=25;
        int sum=Integer.sum(num1,num2);
        System.out.println("sum: "+sum);
        }
        
        }

When the above code is executed, it produces the following result

sum: 80

 

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