Java Coding Challenges

Java coding challenges - find palindrome number, sort 1 million integers in Big O(1) time, check number is prime, anagram buckets, reverse a string, check Armstrong number, check factorial of a number, pangram sentence.

Anagrams string checker in Java

Carvia Tech | July 24, 2020 | 2 min read | 1,061 views | Java Coding Challenges

Two strings are called anagrams if they contain same set of characters but in different order. Here we will evaluate anagrams using a Java Program

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Armstrong Number in Java

Carvia Tech | July 24, 2020 | 2 min read | 597 views | Java Coding Challenges

In an Armstrong number (also known as _narcissistic number_), is a number that is the sum of its own digits each raised to the power of the number of digits

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Factorial in Java using recursion

Carvia Tech | July 24, 2020 | 2 min read | 191 views | Java Coding Challenges

We will use recursion to calculate factorial of a number in Java along with a Java 8 stream approach

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Palindrome checker in Java

Carvia Tech | July 24, 2020 | 2 min read | 1,039 views | Java Coding Challenges

A palindrome is a word, number, or other sequence of characters which reads the same backward as forward, such as madam, racecar or 454.

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pangram checker in java

Carvia Tech | December 26, 2019 | 2 min read | 2,405 views | Java Coding Challenges

A pangram is a sentence containing every letter in the English Alphabet (a-z). Pangram example: The quick brown fox jumps over the lazy dog

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Check a number is Prime: Java Coding Problem

Carvia Tech | October 30, 2019 | 3 min read | 488 views | Java Coding Challenges

In this article we will learn if a given number is prime or not. The solution presented here may not be best optimized, but it should be sufficient from interview point of view.

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Check if the given string is palindrome

Carvia Tech | September 09, 2019 | 2 min read | 365 views | Java Coding Challenges

In this article we will write java code to check if the given input string is palindrome or not.

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How to reverse a number in Java

Carvia Tech | September 07, 2019 | 1 min read | 874 views | Java Coding Challenges

This is a common SDET interview questions where interviewer asks for reversing a number using any language.

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Given a collection of 1 million integers, All ranging between 1 to 9, how would you sort them in Big O(n) time

Carvia Tech | August 03, 2019 | 2 min read | 669 views | Java Coding Challenges

This is a typical Integer Sorting problem with a constraint that the number range to sort is very limited in spite 1 million total entries. Integer Sorting with limited range is achieved efficiently with Bucket Sorting.

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Find two numbers of which the product is maximum in an array

Carvia Tech | May 27, 2019 | 1 min read | 582 views | Java Coding Challenges

We can easily find two number in an array whose product is maximum by sorting the input integer array in descending order first and then multiplying the first two numbers.

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