Write a simple program to add two integers in Java?

Here’s a simple and crisp Java program to add two integers:

public class AddTwoNumbers {
    public static void main(String[] args) {
        int a = 10;
        int b = 20;

        int sum = a + b;

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

Output:

Sum = 30

Summary:

• int a, b → input numbers
• a + b → addition operation
• System.out.println() → prints result

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Reusable method version:

Here’s the reusable method version:

public class AddTwoNumbers {

    // Reusable method
    public static int add(int a, int b) {
        return a + b;
    }

    public static void main(String[] args) {
        int result = add(10, 20);  // method call
        System.out.println("Sum = " + result);
    }
}

This is better because:

• add() is reusable anywhere in your code
• Improves modularity & testability
• Clean separation of logic from main()

Output:

Sum = 30