Spring features: Core, Boot, Data, Test, Web, Validation, Security, AOP. Code examples, detailed comments, related documentation, interesting articles.

Quick reference guide to JavaScript with examples and explanations.

The most common commands, queries, functions in SQL-type databases. Cheat sheet for memory!

Multithreading. Synchronized methods, blocks, сollection. Section cheat sheet. For memory!

About me, fast and furious ))

Evolution of application development - step by step from pure java to spring (with Tests).

Spring security, remember-me, authentication, CORS, CSRF, FilterChain, JWT, Method Level Security, OAuth2 (with Tests)

Vacation Pay Calculator - simple spring boot application (v. ReadMe.md)

Examples of work with Socket. Studying HTTP, TCP, UDP protocols. Workout with HTTP Servlets, Web Filter, Locale. MVС as an architectural concept to web application development: DAO, DTO, Entity, Au…

Examples of work with JDBC. DAO, CRUD concept. Simple SQL and Prepared Statement queries. Description in doc folder. Section cheat sheet. For memory!

Examples of work with Junit5, Mockito, AssertJ, Jacoco. Description in doc folders. Section cheat sheet. For memory!

Spring task project: Boot, Data, Test, Web, Validation, Security. Test with Docker (Testcontainers), DB migration Liquibase, MVC pattern, REST

A primitive console calculator - converter. Test task Kata Academy.

Hibernate lessons: Primary keys, Embedded components, Mapping entity associations, HQL, Criteria API, QueryDSL, N+1, Transactions & Locks, Listeners & Interceptors, Hibernate Envers, Second Level C…

Groovy programming language basics, step by step. Description in doc folders. Section cheat sheet.

The first training project on Kotlin. Allows you to find out information about a bank card by BIN from www.binlist.net

Simple FTP client and testing its methods using the TestNG framework. Test task solution. Description in doc folder.

IO / NIO short description step by step. Сontinuation of sections JavaExtended-26-32. For memory!

Stream API. Section cheat sheet. For memory!

JUnit framework simple tests in Generics (Simple Objects, Collections). Section cheat sheet. For memory!

JUnit framework simple tests in various situations. Section cheat sheet. For memory!

Enum, Reflection API, Annotation, Class Scanner. Section cheat sheet. For memory!

My first steps in Java. Section cheat sheet. For memory

IO API – (Input & Output). Reader. Writer. Serialization. InputOutputStream. Section cheat sheet. For memory!

Collections. My second steps in Java. Section cheat sheet. For memory!

OOP. Generics. Comparable. Comparator. My second steps in Java. Section cheat sheet. For memory!

RegEx: Example, OneSymbol, MultiSymbol, GroupNumber. StringSplit, StringReplaceAll, printf, Formatter. Section cheat sheet. For memory!

IO / NIO – Chanel, Buffer, Path, Files (copy, move, read, write, delete), Files.walkFileTree, FileVisitor. Section cheat sheet. For memory!