Graphs
Graph is a collection of nodes that may or may not be connected to each other.
Posts by Category
Blog
Strings
String
Stacks and Queues
Stacks
Hash Tables
A data structure that store data in key-value pairs and provides fast insertion, deletion and searching.
Linked Lists
Is very similar to array, at least conceptually, to an array.
Arrays
There are two types of arrays. Static and dynamic ones.
Logarithm
It’s mathematical concept which is very often used in Computer Science in context of algorithms complexity, it’s even sounds similar 😀
Big O Notation
The Big O Notation is a mathematical, asymptotic notation that describes time complexity and space complexity of algorithms/ function when the argument tends...
Memory
Key Terms
Data structures knowledge compendium
What are data structures?
Complexity Analysis
It’s a process in which we determine how efficient an algorithm is. There are multiple ways to solve the same issue but the complexity analysis will likely d...
How to approach refactoring
Introduce
Difference between @Mock and @MockBean
Introduce
Database SQL vs NoSQL
Introduce
Composition, Aggregation and Association
Introduce
Sets in java
Set
Maps in java
Map
Lists in Java
List
BigDecimal and BigInteger in Java
BigDecimal
DeMorgan’s Laws
DeMorgan’s Laws
Transactions with Spring and JPA
What is Transactions?
JPA/Hibernate Cascade types
What is Cascading?
Hibernate Fetch Mode vs Fetch Type
Fetch Mode vs Fetch Type
Builder Design Patter
Builder is a creational design pattern that lets you construct complex objects step by step. The pattern allows you to produce different types and representa...
Java equals and hashCode contract
Equals() method
Comparable and Comparator Interfaces
Comparable.
Spring Cache
What is Spring Cache? How to configure it in your project and how to use it? How does Spring Cache work? How to add an external provider that allows flexible...
MongoDB Indexes
Why use indexes?
Observer Design Patter
The observer pattern is a software design pattern in which an object, named the subject, maintains a list of its dependents, called observers, and notifies t...
Spring Bean Scopes
The scope defines the runtime context within which the bean instance is available.
Custom Assertions with AssertJ
You may have contact with test that are not too readable, as the communicates when they fail. In that case you should take in consideration creating your own...
Strategy Design Patter
Strategy is a behavioral design pattern that lets you define a family of algorithms, put each of them into a separate class, and make their objects interchan...
SOLID: The First 5 Principles of Object Oriented Design
SOLID is an acronym for the first five object-oriented design (OOD) principles by Robert C. Martin (also known as Uncle Bob).
What are benefits of testing?
Do i really need tests? Isn’t it a waste of time? And other questions like this that you might asked once or still asking yourself. Its not true and let me e...