Practice Core Java Basics in Java

Core Java Basics exercises

1. Declare Variables Java exercise — Declare and print different variable types
2. Swap Two Values Java exercise — Swap the values of two variables
3. Type Casting Java exercise — Convert between different data types
4. Arithmetic Operations Java exercise — Perform basic math operations
5. String Concatenation Java exercise — Combine strings together
6. Modulus Operator Java exercise — Use modulus to get remainder
7. Sum of Digits Java exercise — Calculate the sum of all digits in a number
8. Reverse a Number Java exercise — Reverse the digits of an integer
9. Count Digits Java exercise — Count the number of digits in an integer
10. Calculate Power Java exercise — Calculate base raised to exponent without Math.pow
11. Calculate Factorial Java exercise — Calculate factorial of a number
12. Palindrome Number Check Java exercise — Check if a number is a palindrome
13. Greatest Common Divisor Java exercise — Find GCD of two numbers
14. Least Common Multiple Java exercise — Find LCM of two numbers
15. Armstrong Number Check Java exercise — Check if a number is an Armstrong number
16. Perfect Number Check Java exercise — Check if a number is perfect
17. Number to Words Java exercise — Convert a single digit to its English word
18. Triangle Type Checker Java exercise — Determine if sides form a valid triangle and its type
19. Happy Number Check Java exercise — Check if a number is a happy number
20. Strong Number Check Java exercise — Check if a number is a strong number
21. Automorphic Number Check Java exercise — Check if a number is automorphic
22. Binary to Decimal Java exercise — Convert a binary string to its decimal equivalent
23. Decimal to Binary Java exercise — Convert a decimal number to its binary representation
24. Prime Factorization Java exercise — Find all prime factors of a number
25. Harshad Number Check Java exercise — Check if a number is divisible by sum of its digits
26. Neon Number Check Java exercise — Check if sum of digits of square equals the number