Program to add two integer numbers in Java

First :

package com.company;

import java.util.Scanner;
public class Main {

    public static void main(String[] args) {

        int number1, number2, sum;
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter your first number to add:");
        number1 = sc.nextInt();

        System.out.println("Enter your second number to add:");
        number2 = sc.nextInt();

        sc.close();
        sum = number1 + number2;
        System.out.println("The sum of these two numbers will be:"+sum);
    }
}

Output:

Second :

package com.company;

public class Main {

    public static void main(String[] args) {

        int number1 = 21;
        int number2 = 11;

        System.out.println("The two numbers to be added are: " + number1 + " " + number2);

        int add = number1 + number2;

        System.out.println("The addition of these two numbers is: " + add);
    }
}

Output :

Third :

package com.company;
public class Main {

    public static void main(String[] args) {

        int number1 = 23;
        int number2 = 17;
        int add = number1 + number2;

        System.out.println(add);

    }
}

Output :