Java problem Solving Questions

Java Problems? Challenge Accepted!

Welcome to my Java dojo! 🥋 Where syntax errors meet their match, and logic bugs are defeated with ruthless efficiency. If you've ever stared at your screen wondering why your "simple" code refuses to run, congratulations—you’re a true developer! Let's embrace the struggle together and solve these Java challenges like coding ninjas. Lets start the journey from base to advance.

Basic questions to mastery the skill:

Loops:

• Sum of Natural Numbers – Write a program to calculate the sum of the first N natural numbers using a loop.

• Factorial of a Number – Compute the factorial of a given number using a loop.

• Reverse a Number – Take an integer input and print its reverse.

• Check for Prime Number – Determine whether a given number is prime or not.

• Fibonacci Series – Print the first N terms of the Fibonacci sequence using a loop.

• Armstrong Number – Check if a given number is an Armstrong number.

• Palindrome Number – Determine whether a number is a palindrome.

• Pattern Printing – Print different patterns like pyramids, stars, and numbers.

• LCM and GCD – Find the LCM and GCD of two numbers using loops.

• Sum of Digits – Find the sum of digits of a given number using a loop.

Arrays:

• Find Maximum and Minimum – Find the largest and smallest element in an array.

• Reverse an Array – Reverse the elements of an array.

• Find Second Largest Element – Find the second largest element in an array without sorting.

• Remove Duplicates – Remove duplicate elements from a sorted/unsorted array.

• Rotate an Array – Rotate the elements of an array to the left/right by K positions.

• Merge Two Sorted Arrays – Merge two sorted arrays into one sorted array.

• Check if Array is Sorted – Check if a given array is sorted in ascending or descending order.

• Find Missing Number – Find the missing number in an array of N-1 elements (1 to N).

• Find Pair with Given Sum – Given an array and a sum, find a pair of elements that add up to the sum.

• Rearrange Array (Negative & Positive) – Move all negative numbers to one side of the array.

Strings:

• Reverse a String – Reverse a given string without using built-in functions.

• Check Palindrome String – Check if a given string is a palindrome.

• Count Vowels and Consonants – Count the number of vowels and consonants in a string.

• Check Anagram – Check if two given strings are anagrams of each other.

• Find Duplicate Characters – Find and print duplicate characters in a string.

• Remove Vowels – Remove all vowels from a given string.

• Longest Word in a Sentence – Find the longest word in a given sentence.

• Count Words in a String – Count the number of words in a given string.

• Check if String Contains Only Digits – Verify if a string contains only numbers.

• Sort Characters in a String – Sort characters in a string alphabetically.

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"If you think this problem was challenging, wait till you see what I’ve got next! 😉 Stay tuned—because in Java, the best loops always come back!"

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