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Introduction to Java

Add Two Integers - Java Program

Method 1 - Using Scanner

Java 
import java.util.Scanner;


 


public class AddTwoIntegers {


    public static void main(String[] args) {


 


        // Create Scanner object for taking user input


        Scanner sc = new Scanner(System.in);


 


        // Asking user to enter two numbers


        System.out.print("Enter first number: ");


        int num1 = sc.nextInt();


 


        System.out.print("Enter second number: ");


        int num2 = sc.nextInt();


 


        // Adding the two numbers


        int sum = num1 + num2;


 


        // Displaying the result


        System.out.println("The sum is: " + sum);


 


        sc.close(); // Closing scanner


    }


}

Output

 
OUTPUT :
Enter first number: 10
Enter second number: 25
The sum is: 35

Step-by-Step Explanation

  1. import java.util.Scanner;
    • Imports the Scanner class to allow input from the keyboard.
  2. Scanner sc = new Scanner(System.in);
    • Creates a Scanner object to read user input.
  3. int num1 = sc.nextInt();
    • Reads an integer entered by the user and stores it in num1.
  4. int num2 = sc.nextInt();
    • Reads another integer and stores it in num2.
  5. int sum = num1 + num2;
    • Performs the addition of num1 and num2.
  6. System.out.println("The sum is: " + sum);
    • Displays the result of the addition.
  7. sc.close();
    • Closes the Scanner object.

 

Method 2 - Without Using Scanner

Java 
public class AddTwoIntegers {


    public static void main(String[] args) {


        int num1 = 10;


        int num2 = 20;


 


        int sum = num1 + num2;


        System.out.println("Sum = " + sum);


    }


}

Output

 
OUTPUT :
Enter first number: 10
Enter second number: 25
The sum is: 35

Method 3 - Using Methods

Java 
public class AddUsingMethod {


 


    static int add(int x, int y) {


        return x + y;


    }


 


    public static void main(String[] args) {


        int a = 15;


        int b = 25;


        int result = add(a, b);


 


        System.out.println("Sum = " + result);


    }


}

Output

 
OUTPUT :
Enter first number: 10
Enter second number: 25
The sum is: 35

Method 4 - Add Two Integers (Using Command-Line Arguments)

Java 
public class AddUsingCLA {


    public static void main(String[] args) {


        int a = Integer.parseInt(args[0]);


        int b = Integer.parseInt(args[1]);


 


        System.out.println("Sum = " + (a + b));


    }


}

Output

 
OUTPUT :
Enter first number: 10
Enter second number: 25
The sum is: 35

Output

 
RUN :
java AddUsingCLA 10 20

Method 5 - Add Two Integers (Using Swing GUI)

Java 
import javax.swing.*;


 


public class AddSwing {


    public static void main(String[] args) {


 


        String n1 = JOptionPane.showInputDialog("Enter first number:");


        String n2 = JOptionPane.showInputDialog("Enter second number:");


 


        int a = Integer.parseInt(n1);


        int b = Integer.parseInt(n2);


 


        int sum = a + b;


 


        JOptionPane.showMessageDialog(null, "Sum = " + sum);


    }


}

Method 6 - Add Two Integers (OOP Based)

Java 
class Addition {


    int a, b;


 


    Addition(int x, int y) {


        a = x;


        b = y;


    }


 


    int add() {


        return a + b;


    }


}


 


public class AddOOP {


    public static void main(String[] args) {


        Addition obj = new Addition(30, 40);


        System.out.println("Sum = " + obj.add());


    }


}

Output

 
OUTPUT :
Enter first number: 10
Enter second number: 25
The sum is: 35

Method 7 - Add Two Integers (Using Constructor)

Java 
public class AddUsingConstructor {


 


    int sum;


 


    AddUsingConstructor(int x, int y) {


        sum = x + y;


    }


 


    void display() {


        System.out.println("Sum = " + sum);


    }


 


    public static void main(String[] args) {


        AddUsingConstructor obj = new AddUsingConstructor(50, 70);


        obj.display();


    }


}

Output

 
OUTPUT :
Enter first number: 10
Enter second number: 25
The sum is: 35

Method 8 - Add Two Integers (Using Wrapper Classes)

Java 
public class AddUsingWrapper {


    public static void main(String[] args) {


 


        Integer a = 20;


        Integer b = 30;


 


        Integer sum = a + b;


 


        System.out.println("Sum = " + sum);


    }


}

Output

 
OUTPUT :
Enter first number: 10
Enter second number: 25
The sum is: 35

Method 9 - Add Two Integers (Using BufferedReader)

Java 
import java.io.*;


 


public class AddUsingBufferedReader {


    public static void main(String[] args) throws Exception {


 


        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));


 


        System.out.print("Enter first number: ");


        int a = Integer.parseInt(br.readLine());


 


        System.out.print("Enter second number: ");


        int b = Integer.parseInt(br.readLine());


 


        System.out.println("Sum = " + (a + b));


    }


}

Output

 
OUTPUT :
Enter first number: 10
Enter second number: 25
The sum is: 35

Method 10 - Add Two Integers (Using JOptionPane)

Java 
import javax.swing.*;


 


public class AddJOptionPane {


    public static void main(String[] args) {


 


        int a = Integer.parseInt(JOptionPane.showInputDialog("Enter first number"));


        int b = Integer.parseInt(JOptionPane.showInputDialog("Enter second number"));


 


        int sum = a + b;


 


        JOptionPane.showMessageDialog(null, "Sum = " + sum);


    }


}

Output

 
OUTPUT :
Enter first number: 10
Enter second number: 25
The sum is: 35

Method 11 - Add Two Integers (Using Function With Return Value)

Java 
public class AddWithReturn {


 


    static int add(int a, int b) {


        return a + b;


    }


 


    public static void main(String[] args) {


        System.out.println("Sum = " + add(12, 18));


    }


}

Output

 
OUTPUT :
Enter first number: 10
Enter second number: 25
The sum is: 35

Method 12 - Add Two Integers (Using Static Block)

Java 
public class AddUsingStaticBlock {


 


    static int a, b, sum;


 


    static {


        a = 10;


        b = 20;


        sum = a + b;


    }


 


    public static void main(String[] args) {


        System.out.println("Sum = " + sum);


    }


}

Output

 
OUTPUT :
Enter first number: 10
Enter second number: 25
The sum is: 35
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