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Java 8 String streams and finding the first non repeated character with functional programming

Q1.Find the first non repeated character in a given string input using Java 8 or later?
A1.Extends Find the first non repeated character in a given string input …

Java coding practice problems – prime and powerful

There is no other way to pass the Java coding tests other than practicing. I have failed Java coding tests due to lack of practice. How often do you get …

Java coding question on recursion and generics

Q. Can you write Java code to compute a collection of numbers supplied to it? The computation could be addition, subtraction, etc. Use recursion to compute the numbers. Here are …

Linear & Binary Search in Java

Q. Can you write a code to search for number 5 in 7 3 6 8 2 9 5 4? A. The code below uses the linear search algorithm. The …

LinkedList creating from scratch in Java

Q. How to create a LinkedList from scratch A. Adding Removing Step 1: The node that stores the data and the reference to the next Node.

package linked.list;

public class

…

Palindrome

Q1. Can you write a function to determine if a given string input is a palindrome? A palindrome is a word or sentence that reads the same forward as it …

Part 1: Badly designed Java classes & interfaces

4 Part practical design concept series Part 1: Abstraction | Part 2: Single Responsibility Principle | Part 3: Open Close Principle | Part 4: Dependency Inversion Principle. Q. Can you …

Part 2: Badly designed classes & interfaces – Single Responsibility Principle (SRP)

4 Part practical design concept series Part 1: Abstraction | Part 2: Single Responsibility Principle | Part 3: Open Close Principle | Part 4: Dependency Inversion Principle. Java design principle …

Part 3: Badly designed classes & interface – Open Closed Principle (i.e OCP)

4 Part practical design concept series Part 1: Abstraction | Part 2: Single Responsibility Principle | Part 3: Open Closed Principle | Part 4: Dependency Inversion Principle. Java Open closed …

Part 4: Badly designed classes & interfaces – Dependency Inversion Principle (i.e. DIP)

4 Part practical design concept series Part 1: Abstraction | Part 2: Single Responsibility Principle | Part 3: Open Close Principle | Part 4: Dependency Inversion Principle. Q. What is …

Prerequisite: if want to work with Maven & eclipse

Here are the basic steps as to how I set up “passing” project using maven & eclipse for the coding exercises. If you are using other IDEs or command line …

Processing data from a file & sorting them

Q. Complete the following “DataProcessingImpl.java” class ….. so that the unit tests shown below pass?

package com.passing.unittests;

public class DataProcessingImpl implements DataProcessing {
    
    public String getContents(String path) {
        return null;

…

Q01-Q07 written test questions and answers on core Java

Written tests can help short-list candidates and often used by recruitment agencies and prospective employers. Here are some popular written test questions and answers. Note: Multiple choice questions may have …

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Arulkumaran Kumaraswamipillai

In 1999, I transformed my career from a Mechanical engineer to a self-taught Java engineer within 1 year, and a Java freelancer within 2 years, and in 2016 to a self-taught Big Data freelancer.

Over the past 22+ years, I have built a high-demand career as a Java & Big Data freelancer, delivering mission-critical solutions for 13+ top-tier organisations with a proven track record that has generated over 130+ job offers to choose from 150+ job interviews.

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How would you go about.. building an ETL pipeline to handle 3k TPS (i.e transactions per second) - April 17, 2026
00b: Python variable scopes, assigning types optionally and execution order interview Q&As - April 11, 2026
How to prepare for the Java job interviews? - January 3, 2026

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Blog Archives

Java 8 String streams and finding the first non repeated character with functional programming

Java coding practice problems – prime and powerful

Java coding question on recursion and generics

Linear & Binary Search in Java

LinkedList creating from scratch in Java

Palindrome

Part 1: Badly designed Java classes & interfaces

Part 2: Badly designed classes & interfaces – Single Responsibility Principle (SRP)

Part 3: Badly designed classes & interface – Open Closed Principle (i.e OCP)

Part 4: Badly designed classes & interfaces – Dependency Inversion Principle (i.e. DIP)

Prerequisite: if want to work with Maven & eclipse

Processing data from a file & sorting them

Q01-Q07 written test questions and answers on core Java

300+ Big Data Interview Questions - FAQs

300+ Java Interview Questions - FAQs

Take the road less travelled

10+ Companion Techs Interview Q&As

16+ Java Tech Key Areas Interview Q&As

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300+ Java Interview Questions Answered

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