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Beginner Java Programs

These are the classic small programs every Java learner should be comfortable writing from scratch. They build confidence with loops, conditionals, and basic logic before moving to bigger topics.

Why practice these?

These are the classic small programs every Java learner should be comfortable writing from scratch. They build confidence with loops, conditionals, and basic logic before moving to bigger topics.

Program 1: Check if a Number is Even or Odd

java
public class EvenOdd {
    public static void main(String[] args) {
        int number = 15;
        if (number % 2 == 0) {
            System.out.println(number + " is even");
        } else {
            System.out.println(number + " is odd");
        }
    }
}

Output:

15 is odd

Program 2: Find the Factorial of a Number

java
public class Factorial {
    public static void main(String[] args) {
        int number = 5;
        int factorial = 1;
        for (int i = 1; i <= number; i++) {
            factorial *= i;
        }
        System.out.println("Factorial of " + number + " is " + factorial);
    }
}

Output:

Factorial of 5 is 120

Program 3: Check if a Number is Prime

java
public class PrimeCheck {
    public static void main(String[] args) {
        int number = 29;
        boolean isPrime = true;

        if (number <= 1) {
            isPrime = false;
        } else {
            for (int i = 2; i <= Math.sqrt(number); i++) {
                if (number % i == 0) {
                    isPrime = false;
                    break;
                }
            }
        }
        System.out.println(number + " is prime: " + isPrime);
    }
}

Output:

29 is prime: true

Key Points to Remember

  • Start with small, self-contained programs before attempting larger multi-class projects.
  • Practicing the same type of problem in a few different ways builds stronger logic-building skills.
  • These beginner programs are frequently asked in college assignments and entry-level interviews.