Introduction

Java is a high-level, object-oriented programming language widely used for developing desktop, web, and mobile applications. It is platform-independent, meaning Java programs can run on any system that has a Java Virtual Machine (JVM). This lab introduces the basics of Java programming, including displaying output, taking user input, and performing simple arithmetic operations.

Objectives

The objectives of this lab are:

To learn how to display output in Java
To take input from the user using the Scanner class
To perform basic arithmetic operations (sum and average)

Program 1: Display “Welcome to Java Programming”

Source Code:

Welcome.java

public class Welcome {
    public static void main(String[] args) {
        System.out.println("Welcome to Java Programming");
    }
}

Output:

Screenshot From 2026-01-01 11-31-33.png

Program 2: Display ID and Name from User

Source Code:

UserInfo.java

import java.util.Scanner;

public class UserInfo {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter ID: ");
        int id = sc.nextInt();
        sc.nextLine(); // consume newline

        System.out.print("Enter Name: ");
        String name = sc.nextLine();

        System.out.println("ID: " + id);
        System.out.println("Name: " + name);

        sc.close();
    }
}

Output:

Screenshot From 2026-01-01 11-33-00.png

Program 3: Calculate Sum and Average of Three Numbers

Source Code:

SumAverage.java

import java.util.Scanner;

public class SumAverage {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter first number: ");
        double num1 = sc.nextDouble();

        System.out.print("Enter second number: ");
        double num2 = sc.nextDouble();

        System.out.print("Enter third number: ");
        double num3 = sc.nextDouble();

        double sum = num1 + num2 + num3;
        double average = sum / 3;

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

        sc.close();
    }
}

Output:

Screenshot From 2026-01-01 11-35-53.png

Conclusion

In this lab, we learned the fundamentals of Java programming. We explored how to write a simple Java program, take input from users, and perform arithmetic calculations. This lab provides a strong foundation for understanding more advanced Java concepts in future labs.