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05: Finding the 2nd highest number in an array

Requirements gathering Does the array allow duplicates? If duplicates are allowed, then do you need to report duplicates? For example, in {2,4, 6, 3, 6, 5}, is 6 or 5 the …

08: Write code to add, subtract, multiply, and divide given numbers?

A trivial coding example (i.e. a Calculator) tackled using the following programming paradigms in Java not only to perform well in coding interviews, but also to learn these programming paradigms.


17 Java Coding Tips for job interviews and pre-interview coding tests

Java coding questions are very common in job interviews. Good coding skills are essentials for passing the peer code reviews with flying colors. Here are 17 coding tips with Java examples.…

Fibonacci number

Q1. Can you write a function to determine the nth Fibonacci number? The Fibonacci numbers under 2000 are : 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, …

Fibonacci number with caching and Java 8 FP

Complimenting Fibonacci number coding – iterative and recursive approach, we can improve performance by caching. If you run this

Find 2 numbers from an array that add up to the target

Q1. Given an array of integers, find two numbers such that they add up to a specific target number? For example, Given numbers: {2, 3, 8, 7, 5} Target number: 9 …

Find the first non repeated character in a given string input

Pseudocode 1) Precodnition check for null or empty input. 2) Loop throught the input string, and store each “character” as a key in a map with the value being the “character …

Finding the missing numbers Java example

Q. Can you write code to identify missing numbers in a given array of numbers?

Solution 1: Assuming that the given numbers are in order

Finding the perfect number

Q. Can you write code to output the perfect number between a given range? Definition: A perfect number is a positive integer that is equal to the sum of its proper …

Fizz Buzz

Q1. Write a program that prints numbers from 1 to 30, but for multiples of three print “Fizz” instead of the number and for the multiples of five print “Buzz”. For …

Generating random numbers in Java

Q1. Can you write Java code to generate random numbers between a given range? A1. E.g. 0 and 9 or 5 to 35, and so on.

Huffman coding in Java

This is a very decent coding exercise to sharpen your coding skills. Nicely explained with diagrams and complete code. Q1. What is Huffman coding? A1. Huffman coding is a compression technique …

Iteration Vs Recursion

Q1. Can you write a sample code that will count the number of “A”s in a given text “AAA rating“? Show both iterative and recursive approaches?

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800+ Java Interview Q&As

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Learn by categories such as FAQs – Core Java, Key Area – Low Latency, Core Java – Java 8, JEE – Microservices, Big Data – NoSQL, etc. Some posts belong to multiple categories.