TigerCard - Fare Calculation Problem

With the recent introduction on Java 17 by Oracle,  I thought to revise the software  principles (like SOLID, KISS, YAGNI etc) whic...

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Singleton Design Pattern

Different ways to make Thread Safe Singleton Eager Initialization JVM Lazy load  - (Best object oriented way) Enum Double Check locking Eage...

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Find the depth of a large but evenly distributed Json

OECD (The Organisation for Economic Co-operation and Development) regularly publishes country data for various financia...

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Java Primitives vs Wrapper : Which one to use?

Just for the reference, In java  primitive type variables  occupy below s...

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Difference Between Java Monitor and Lock

As  we all are aware, in Java programming language  each object  in Java is  associated  with a  monitor , which a t...

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Java Synthetic Methods — What are these?

I am one of those curious souls who scrolls through all the functions of the Javado...

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Should I use DB to store file ?

I have recently encountered a large scale system which used Oracle DB for storing images, PDF's, Word Documents e...

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Food for thought — Writing Code From Scratch

What I cannot create, I do not understand. — Richard’s last words on his blackboard at the tim...

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Basic Mistakes of Writing Getters/Setters in Java

Well, after reading the title, first thought which comes to mind is ...

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Why to use Hikari Connection Pool ?

Hikari  Connection Pooling (or Hikari CP) is the new kid on the block, though a late entrant in pooling mech...

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Design Problem: Parking Lot

Designing a Parking Lot Application has been one of the popular questions in many of the companies like Thou...

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Choosing data type for monetary Calculation (In Java)— Float ? Double ? Or Bigdecimal

W hen I first studied Basic Arithmetic rational numbers, irrational numbers etc it aroused curiosity in me f...

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How to build a Tiny URL service that scales to billions?

One of the design constraints of Twitter is that every message is ...

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Deep/Shallow Cloning in Java

Cloning an object is a popular way to create copies of the Java ...

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All Possible ways - How to Debug a Java Application End - to -End?

Troubleshooting or “Debugging” a Java based application is one of the traits of a h...

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Designing a Centralized Logging App

Why Do I need a centralized Logging application ? In which case it is must to have a centrali...

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Leaky/Token bucket algorithm for flow control

It’s a common joke that most programmers are theists and are strong believers of deities as they can never a...

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Serialization Techniques for Highly Scalable systems

When building a architecture(microservice or any other type) most common approach t...

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Cache Refreshing Techniques

L ess frequently changing & often accessed data is usually kept in cache to avoid expensive database q...

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What is Cache Stampede ?

Cache stampede  is often not considered a big problem for small scale systems but i...

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