Simple Java Programs for Beginners

Java, a versatile and widely adopted programming language, finds applications in diverse domains. For beginners exploring Java, below are five uncomplicated simple programs that introduce key concepts and facilitate a smooth start with the language.

1. Print Multiplication Table:

This program prints the multiplication table of a given number.

import java.util.Scanner;
public class MultiplicationTable {
 public static void main(String[] args) {
 Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
 int num = scanner.nextInt();
for (int i = 1; i <= 10; i++) {
 System.out.println(num + " x " + i + " = " + (num * i));
 }
scanner.close();
 }
}

Output:

Enter a number: 5
5 x 1 = 5
5 x 2 = 10
5 x 3 = 15
5 x 4 = 20
5 x 5 = 25
5 x 6 = 30
5 x 7 = 35
5 x 8 = 40
5 x 9 = 45
5 x 10 = 50

2. Calculate Average of Numbers:
This program calculates the average of a series of numbers entered by the user.

import java.util.Scanner;
public class AverageCalculator {
 public static void main(String[] args) {
 Scanner scanner = new Scanner(System.in);
System.out.print("Enter the number of elements: ");
 int n = scanner.nextInt();
int sum = 0;
 for (int i = 0; i < n; i++) {
 System.out.print("Enter element " + (i + 1) + ": ");
 int num = scanner.nextInt();
 sum += num;
 }
double average = (double) sum / n;
 System.out.println("Average: " + average);
scanner.close();
 }
}

Output:

Enter the number of elements: 5
Enter element 1: 10
Enter element 2: 20
Enter element 3: 30
Enter element 4: 40
Enter element 5: 50
Average: 30.0

3. Reverse a Number:
This program reverses a given number and displays the result.

import java.util.Scanner;
public class ReverseNumber {
 public static void main(String[] args) {
 Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
 int num = scanner.nextInt();
int reversed = 0;
 while (num != 0) {
 int digit = num % 10;
 reversed = reversed * 10 + digit;
 num /= 10;
 }
System.out.println("Reversed Number: " + reversed);
scanner.close();
 }
}

Output:

Enter a number: 12345
Reversed Number: 54321

4. Check Armstrong Number:
This program checks if a given number is an Armstrong number.

import java.util.Scanner;
public class ArmstrongNumber {
 public static void main(String[] args) {
 Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number: ");
 int num = scanner.nextInt();
int originalNum = num;
 int sum = 0;
while (num != 0) {
 int digit = num % 10;
 sum += Math.pow(digit, 3);
 num /= 10;
 }
if (sum == originalNum) {
 System.out.println(originalNum + " is an Armstrong number.");
 } else {
 System.out.println(originalNum + " is not an Armstrong number.");
 }
scanner.close();
 }
}

Output:

Enter a number: 153
153 is an Armstrong number.

5. Find Maximum and Minimum:
This program finds the maximum and minimum numbers from a given set of numbers.

import java.util.Scanner;
public class MaxMinFinder {
 public static void main(String[] args) {
 Scanner scanner = new Scanner(System.in);
System.out.print("Enter the number of elements: ");
 int n = scanner.nextInt();
int[] numbers = new int[n];
 for (int i = 0; i < n; i++) {
 System.out.print("Enter element " + (i + 1) + ": ");
 numbers[i] = scanner.nextInt();
 }
int max = numbers[0];
 int min = numbers[0];
for (int i = 1; i < n; i++) {
 if (numbers[i] > max) {
 max = numbers[i];
 }
 if (numbers[i] < min) {
 min = numbers[i];
 }
 }
System.out.println("Maximum: " + max);
 System.out.println("Minimum: " + min);
scanner.close();
 }
}

Output:

Enter the number of elements: 5
Enter element 1: 10
Enter element 2: 20
Enter element 3: 5
Enter element 4: 30
Enter element 5: 15
Maximum: 30
Minimum: 5

Read More: 15 Basic Java Programs

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