Java Programming: Java Programs for Interview Preparation

Learn to implement a simple Java program that adds, subtracts, multiplies, and divides two numbers using arithmetic operators, variables, and optional user input with Scanner.

Write a Java program that reads dividend and divisor from the user, uses division and modulus operators to compute the quotient and remainder, and demonstrates the outputs.

Count the digits of a given number using three methods—while loop, for loop, and recursion—by repeatedly dividing by ten and leveraging the modulus operator to track digits.

Compute the sum of all digits of a given number in Java by reading input with a scanner and using a while loop, modulus, and division to accumulate the total.

Compute the power of a number by reading the base and exponent, returning one when the exponent is zero, and implementing with a while loop, recursion, or Math.pow.

Explore how to compute the factorial of a number in Java using a for loop and recursion, including input handling, base conditions, and using big integer for large results.

Learn how to implement a Java program to check palindrome numbers by reversing digits and comparing with the original, using user input and an efficient reversal logic.

Learn to check even or odd numbers in java using the modulus operator, take user input with a scanner, and print even numbers within a range.

Write a Java program that reads a number and checks if it is a prime number by testing divisibility from two to the square root, breaking early on a divisor.

Learn to identify a perfect number by summing proper divisors (excluding the number) and verifying equality in a Java program using a loop up to half the number.

Learn to implement a Java program that identifies Armstrong numbers by summing each digit raised to the power of the digit count and comparing to the original number.

Learn to swap two numbers in Java using a variable and without it, with a = 10 and b = 20, via A plus B and A minus B techniques.