Java Memory Models
Java Memory Models
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Cohesion
Cohesion
Defining Software Architecture
The software community has been engaged in a longstanding debate over how to define “architecture.” Some believe it refers to the underlying structure of a s...
Is Java Pass by Value or by Reference?
Let me answer that question right away, Java is ALWAYS pass by value.
CAP Theorem
The CAP theorem is a concept in distributed computing that states that in any distributed system, you can only have two out of the following three guarantees...
Facade Design Pattern
The Facade design pattern is a structural pattern that allows for hiding the complexity of a subsystem by providing a simple interface to it. The interface ...
Prefer Composition over Inheritance
You probably already thought about this, as its quite popular statement. Let’s delve deeper into the subject. I wrote article that explain what is compositio...
Inversion of Control and Dependency Injection
Inversion of Control and Dependency Injection
Core concepts behind OOP
What does mean object-oriented programming?
Concurrency, Threading and Parallelism
Those two concepts are often misunderstood or used interchangeably, where they are completely different concepts.
What is coupling?
In object-oriented paradigm, Coupling refers to the degree of direct knowledge that one element has of another. We may generally divide coupling to tight and...
Specification Design Pattern
Introduction
Depth First Search in Java
Depth First Search [DFS]
Singleton Pattern
Singleton
Static Factory Method
In an object-oriented language like Java, what could be wrong with constructors? Overall, nothing. Even so, the famous Joshua Block’s Effective Java Item 1 c...
Aggregate Pattern
The Aggregate is one of the main pattern in Domain Driven Design (DDD) introduced by Martin Fowler.
Trees
a data structure that is constructed with nodes, where each has some value and may point to child-nodes, which recursively form subtrees in the tree.
Graphs
Graph is a collection of nodes that may or may not be connected to each other.
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
BigDecimal and BigInteger in Java
BigDecimal
DeMorgan’s Laws
DeMorgan’s Laws
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...