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Intro

Introduction to Java

Quick overview of JDoodle

Displaying Text on The Screen Intro

Hello World - Displaying Text

Understanding the Predefined Code

Common Errors you can run into

Search for errors and fix them with Gen AI

Let's Practice: Fun with Print Statements

Debugging Basics - How to Solve Errors

Additional java features

print vs println - comments and escape sequences

(Optional theory) Java Under the hood

Numbers and basic Math

(Optional) Getting Started with JDoodle

Introduction

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ADVANCED EXERCISE: Displaying Text with Java and Escape Sequences

Intro

Variables Intro and Naming Conventions

Declaring and Initializing variables

Datatypes Quick Overview

Datatypes For Whole Numbers

Datatypes For Floating Point Numbers Float and Double

Datatype Char

Datatype Boolean

Datatype String

Declaring multiple variables at once

Arithmetics with variables

TypeCasting Implicit and explicit

Let's Practice: Shape Transformation

Variables and Data types

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ADVANCED EXERCISE: Variable Manipulation and Data Types in Java

Intro

Introduction to Handling User Inputs

User Input with Text and the Scanner Class

User Input with Numbers and simple addition

Next Line Buffer behaviour

Let's Practice: Calorie counter pro

Solution Calories Counter Pro

Overview of Operators

Modulo Operator

Unary, Increment, Decrement Operators

Relational Operators

Compound Operators

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ADVANCED EXERCISE: Handling User Input and Simple Calculations

Intro

Strings Overview

Strings Creation and Concatenation

Strings length and charAt method

String Comparison with == Comparing References

String Comparison with equal and equalIgnoreCase

String Comparison with compareTo - lexicographically

Cutting strings using substring()

String replace, toUpperCase, toLowerCase

String format with strings and numbers

Operator Precedence and Associativity

Java Basics - Part 2

Let's Practice: Simple Interest Calculator

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ADVANCED EXERCISE: String Manipulation and Comparison in Java

Intro

DISCLAIMER: KEEP AN EYE ON YOUR VERSION

Overview JDK and IDE

(Optional) Advanced knowledge about JDK

Installing the JDK and Java Environment Variable

Programming Java Without any IDE just the text editor

Why IDE?

Installing IntelliJ IDEA

Some cool features of IntelliJ IDEA

Autocompletion and closing a project

Starting from an empty project and unused Variables

Renaming refactoring

Let's Practice: Budget Tracker Plus

Budget Exercise Solution

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ADVANCED EXERCISE: Budget Tracker Plus in Java

Intro

Control Statements in Java overview

If Statement

Nested If Statement

Logical Operators

Let's Practice: Chatbot

If Statements Exercise Chatbot

If Else Control Statements

Nested If Else Control Statements

If Else If Else

If Else If Else - Understanding the Flow using Breakpoints

Ternary Operators

Let's Practice: Galaxy Weather Advisor

Control Statements

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ADVANCED EXERCISE: Galaxy Weather Advisor

Intro

Presentation of the Day - Switch Control Statement

Basic Switch Statement

Default and break

Break and fall through

If Statements vs Switch Statements

Switch Statements with Char

Switch Statements with Strings

Enums and Switch

Why Enums

Switch within switch and prep for exercise

Let's Practice: Text based Adventure

Text based Adventure Game with Switch Statement

Java Switch Statements

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ADVANCED EXERCISE: The Ultimate Adventure Game Using Switch Statements

Intro

Loops Introduction Presentation For Loop

For Loops

Let's Practice: Star Pyramid Builder (Beginner)

Nested For Loops

Pyramids with for loops

Interview Question Fibonacci Sequence

Job Interview question: Fibonacci sequence

While Loop

Do While Loop

Break Keyword in Loops

Continue Keyword in Loops

Labels and break and continue

Let's Practice: Controlling loops

Loops

Interview Question Harshad Number

Job Interview Question: Harshad Number

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ADVANCED EXERCISE: Simple Calculator with Loops

Intro

Introduction to Arrays

Declaring, Initializing, Accessing and Modifying arrays

Array Length and For Loops to iterate through arrays

Enhanced For Loop - For Each Loop

Sum, min and max of an array

Let´s Practice: Rearranging Array Challenge

Rearranging Array Challenge Solution

Arrays Class and common methods

Arrays toString and sort Methods

Array binarysearch method

CopyOf and by value vs by reference

Arrays Fill and equals

Java Arrays

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ADVANCED EXERCISE: Array Shuffle and Operations

Intro

2D Arrays overview

2D Arrays - Declaration, initialization and iteration

2D Arrays - Easier initialization

2D Arrays - Enhanced for loops

2D Arrays - get the largest number

2D Arrays - get the sum of all items in a 2d array

2D Arrays - Exercise

Job Interview Question: Diagonal Sum

ArrayList Intro

ArrayList and its methods

Let's Practice: Space Travel Simulator

Quiz: Strings & Arrays

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ADVANCED EXERCISE: Space Travel Simulator with 2D Arrays

Intro

Presentation Methods intro

Void Method

Void Methods with parameters

Sandwichmaker 3000

Pass by Value vs Pass by reference

Method that returns something

Subtract Method

Generating random numbers

Intro Word Scramble Game

Building a Word Scramble Game

Interview Question: Validate an Email address

Methods

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ADVANCED EXERCISE: TODO List Application with Methods

Intro

Recursive Methods Intro

Recursive Methods in action - Factorial

Recursive Methods base case and recursive case

Recursive Methods common error - infinite recursion

Creating our secret language app - atbash method

Creating our secret language app - encoding

Creating our secret language app - decoding

Let's Practice: Atbash cipher

Understanding the Method Call stack

Understanding the Method Call stack with debugging

Method stack with recursive methods and overdoing it

For loop alternative for factorials

Visualising high memory usage

Alternative solution

Magic Mirror Exercise

Let's Practice: The Magic Mirror: Reflecting Strings with Recursion

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ADVANCED EXERCISE: String Reverser Using Recursion

Intro

Exercise 1 - Remove duplicate elements from an array

Solution and Explanation

Exercise 2 - Number of Digits

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Intro

Binary Search explanation

Binary Search Introduction and how it works

Game Introduction

Numbers Guessing Game Solution

Explanation and Example Interaction

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Intro

The Problem Statement. What do we want from the Todo App

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Intro

Introduction to OOP presentation

Creating our first class

Creating our first class method

Using Member Variables

Function vs Method

Default Constructor

Parameterized Constructor

The this keyword

Let's Practice: Working with array of Objects

Constructor Overloading

The public, default, and private access modifiers

Setters and understanding why they are important

Let's Practice: Generating Math Quizzes

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ADVANCED EXERCISE: Student Grades Tracker Using Classes

Intro

Understanding the This keyword better

getInstance vs Reference with this

Method Chaining

Using Objects as Parameters

Copy Constructor

The static keyword

Why can't a non-static method be called from a static method

Let's Practice: Dice Rolling Adventure

Dice Game Exercise Solution

Java Constructors and Object Initialization

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ADVANCED EXERCISE: Employee Info Tracker Using this and Static Methods

Intro

Inheritance overview

First steps in inheritance

Super keyword presentation

Super keyword with constructors

Super keyword with methods

Multi-Level Inheritance

Multi-Level Inheritance demo

Method overriding

Method overriding demo

Protected access specifier

Packages and all Access specifiers

Let's Practice: Word Guessing Game

Java Inheritance & OOP Concepts

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ADVANCED EXERCISE: Basic Animal Class with Inheritance

Intro

OOP3 Polymorphism Intro

Hierarchical Inheritance in action

Why Polymorphism

Static Polymorphism Method Overloading

Dynamic Polymorphism Method dispatching

(Optional) Runtime Polymorphism

Abstraction - Abstract and Interface

Abstraction in Action - Payment Processing

Interface syntax

Interface in action

Abstract classes vs Interfaces

Abstract classes vs Interfaces - real world example

Encapsulation

More on OOP Concepts & Polymorphism

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ADVANCED EXERCISE: Vehicle Operations Using Polymorphism

Intro

Presentation about the project - what you will gain

Project: Bank Account Management System

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Now I know basic Java, before we get further, what else do I need to know?

Intro

Collections Framework Intro

The Depths of Arraylists heritage

Overview of List Classes

LinkedList vs ArrayList - Speed Test

Vector vs ArrayList vs Sync Arraylist - Speed Test

Stack

Set overview

Hashset

Hash Table, LinkedHashSet, and TreeSet

Java Collections Framework

Interview Question: Duplicates with index difference

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ADVANCED EXERCISE: Unique Names Tracker Using a HashSet

Intro

Queue and Map Presentation intro

PriorityQueue

ArrayDeque

Map interface and its classes

TreeMap

Hashmap

LinkedHashmap

HashTable and Concurrenthashmap

Iterator Interface

Java Collections Framework

Java Collections Framework

Let's Practice: Word Frequency Counter

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ADVANCED EXERCISE: Basic Task Queue Using ArrayDeque

Intro

Exception Handling Presentation

Try and Catch

Using multiple Catch Blocks

Finally keyword

Rethrowing and Propagation Intro

Throw Keyword

ReThrowing Exceptions

Exception Propagation

Combining Exception Propagation with Exception rethrowing

Custom exceptions intro

Creating custom exceptions

Creating Custom Exceptions2

Let's Practice: Password Validator

Exception Handling

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ADVANCED EXERCISE: Simple Division with Exception Handling

Intro

Java IO Intro

ByteArrayInputStream

Output Classes Intro

Try with resources and write text to a file using FileOutputStream

Try with resources with two resources and write text to a file using BufferedOut

Storing data in all kinds of data types using DataOutputStream

Input Classes Intro

Reading data types from a file using DataInputStream

Reading data from a txt file using BufferedInputStream

File Write Intro

Buffered vs Unbuffered Stream Speeds

Handling Files with the File Class

Checking if file exists and create it if not

Renaming Files with the File Class

Deleting a file using the file class

Creating Folders Directories Paths using the File Class

Displaying all files within a folder using the File Class

Serialization and Deserialization Intro

Serialization in action

Deserialization in action

Final Thoughts about De-Serialization and the transient keyword

Managing Serialization

Let's Practice: Simple Password Manager

Java I/O

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ADVANCED EXERCISE: Writing and Reading from a File

Intro

FXML Intro

Java Based UI vs FXML in larger projects

Understanding XML and more about FXML

Understanding the FXML in the generated file

Using Layouts within Layouts VBox and HBox in FXML

Using Comments in XML

MVC overview

Events in FXML and Alert onMouseEntered

Gridpane

styling and alignment

Style property

Alignment property

Why CSS makes sense

Borderpane in FXML

style.css styling our ui

More styling and hover effect

Let's Practice: Display a Confirmation & Alert Dialog

FXML and JavaFX Introduction

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Intro

JavaFX Overview

Gradle and GroupID

Running our first GUI App

JavaFX File Structure overview

JavaFX Basics - Stage, Scene, Pane

Understanding the HelloApplication.java file

Loading a Resource of fxml type

Creating our own UI with java code

Lambda Expressions theory

Lambda Expressions Calculator

Lambda Expressions vs MultiOperations Implementations

Lambda Expressions why use lambdas

Lambda Expressions as Parameters

Single Argument Lambda expressions

Let's Practice: Adding Buttons on the screen

JavaFX and Basic UI Components

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Intro

JavaFX Shapes Presentation

JavaFX Adding a Rectangle to a pane

JavaFX Adding a Circle and Line to a pane

JavaFX Layout Types

JavaFX Layout HBox

JavaFX Layout VBox

JavaFX Layout Stackpane

JavaFX Layout FlowPane

JavaFX Layout GridPane

BorderPane

Installing Scene Builder

Drag and Drop UI and connect it to our app

Modifying which event will be triggered and how FXML, Controller and Scene Build

Creating a Form with Scene builder

Let's Practice: Creating TextFields

Let's Practice: Creating a Basic Form

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Intro

Handling Keyboard events intro

Building a JavaFX Project from scratch and understanding how the files interact

Using Key Events and EventHandlers as well as EventListeners

Mouse Events intro

Get the Mouse Position via Events

Databinding Intro

Databinding in action - UI Setup

Databinding in action

Move from one Scene to another

Retrieving the stage during runtime

Let's Practice: Moving Shapes using keystrokes

Changing Ball colour based on position

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Intro

Intro Animations

Translate Transition intro

Translate Transition project prep

Translate Transition move an item via animation

Chain Animations

Start and stop animations with a button click

Fade Transition

Rotate Transition

ScaleTransition

Sequential- and ParallelTransition

Using ImageViews

Loading the image

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Intro

Why building the To-Do App is a good idea

What we will build today

Role of the launcher class

Setting up the project from scratch

Understanding Gradle

Intro to MaterialFX and implementing it

Adding MaterialFX to Scene Builder

Fixing an error in the module-info.java file

Setting up the Main Class with the Theme and Stylesheet

Setting up our main interface

Setting up the task card and task controller

Setting up the main Controller and Testing the App with Dummy Data

Styling the ToDo App with CSS

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Intro

What we will build today

Intro to DTOs

Creating a DTO TaskDTO

Changing the architecture of our app

Color Tasks based on status demo

Add Task Intro

Setting up the task dialog UI

Displaying the new task dialog

Adding Tasks via the dialog

Styling the dialog

View Task Dialog Intro

View Task Dialog Prep

Adding an ID to our Tasks

Displaying Task in Dialog

Adding Comments and viewing them

Updating Tasks

Updates to the TaskCardController class

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Intro

Intro for the sorting mechanism

Adding Sorting by Status

Adding Filter by Status Logic

Saving and Loading our Tasks permanently

Adding a Delete Feature

Understanding Observable, Listener and Callable

Outro

Intro

Version Control and Git Overview

Installing Git on Windows

Configure git user details

Git Commands

GitHub Intro

Git Commands Basics in action

Git Branches and Merging

SSH and connecting git to github

SSH and connecting git to github demo

Connecting our Project to github

Let the IDE share your project to github

Commit and Push in IDE

Git

What´s next?

Intro

Spring Intro

Where is spring used

Types of Dependency Injection (DI)

Constructor Dependency Injection

Setter Dependency Injection

More on Setter DI

When to use Constructor DI and when Setter DI

Java Spring

Let´s practice: Smart Home Automation

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Intro

Introduction to Beans and IoC

Lifecycle of beans

Understanding Beans IoC and ApplicationContext better

Advantages of using ApplicationContext

Spring Initializr and ApplicationContext Beans

Making a class a bean, and retrieving it from context

Clean Spring project and more beans

AutoWired - Field Dependency Injection

Clean IoC Architecture with CommandLineRunner and Spring Boot

Spring Beans

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Intro

Autowiring Intro

Autowiring Modes

Autowiring by Type

Autowiring by Name

Autowiring by Constructor

No Autowiring - Manual Wiring

@Component and @Service

@Configuration and @ComponentScan

@Configuration and @ComponentScan in Action

Let's Practice: Personalised Welcome Message

Autowiring

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Intro

Generics and Type Parameter

Why not just use an ObjectPrinter

Bounded Generics

Generic Methods

Generic Methods - swap items in an array

Generic Methods with multiple generic parameters

Bounded Type Parameters in Generic Methods

Let´s Practice: Generic Stack

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Intro

What we will cover today

Field Injection with @Autowired

Understanding DI Hierarchy

Constructor DI vs Field DI

@Qualifier vs @Primary intro

Understanding @Service and @Qualifier demo

@Primary demo

What even is a service?

Interview Question: Peeking Iterator with Field Injection

Dependency Injection

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Intro

Spring vs Spring Boot presentation

Spring Boot Auto Configuration, Setup and @PostConstruct

The Power of @PostConstruct

Spring MVC Explained

CommandLineRunner

MVC ChatApp - Models and Service

MVC ChatApp - Controller and Testing

Let's Practice: Text Based Chat

Spring MVC web under the hood

Spring Boot

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Intro

Introduction to Web Development HTTP GET, POST, PUT, DELETE and API

Understanding HTTP Response codes

REST, Restful, Restless, CRUD

HTTP vs HTTP Methods, REST vs API

Our First REST API Server localhost 8080

HTTP Status Codes and ResponseEntity

@Controller vs @RestController and a bit of JSON

Using @PathVariable

Using @RequestParam for Query Parameters

Using @RequestParam and @PathVariable and when to use what

What are Tomcat Servers

Let's Practice: Listing User Profiles

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Intro

Intro

Intro for the day and Postman

Installing Postman and quick test

JSON Basics, Jackson and ObjectMapper

JSON Serialization with ObjectMapper and Jackson

JSON Deserialization with ObjectMapper and Jackson

Modify JSON dynamically using ObjectNode and JSONNode

Lombok Annotations

@JsonProperty and @JsonPropertyOrder

@JsonIgnore and @JsonInclude

Lombok @Setter and @Getter

Lombok @ToString, @NoArgsConstructor, @AllArgsConstructor, @EqualsAndHashCode

Let's Practice: Personal Expense Tracker

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Outro

SpringBoot RESTful services POST and PUT

Post request and @RequestBody

POST with Postman

Storing Products in a JSON and Updating our Request

Get Products and Get Product by ID

PUT operation - Updating the database

Delete operation CRUD

Let's Practice: Product Management API

RESTful API

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Intro

Expense @Data Class

Loading the Expenses

Filtering by Category like a pro using stream map

Refactoring, Filtering and Making Services

Testing our other endpoints

FindById

AtomicLong and Adding Items with PUT

Updating with PUT

Deleting Expenses

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Intro

Spring Data Access Intro

Spring Data Access Advantages

JDBC and JPA

Hibernate

Understanding different Database Types and H2 Database

Intro to H2 Databases

Setting up our H2 Project and application.yml

Setting up an Entity

Repository, Service, Controller and Testing

Testing the h2 console

Spring Data Access

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Intro

H2 for our Expense Tracker Intro

Adding dependencies and the application.yml to our expense tracker app

Adding the Entity and the Repository

Neon PostgreSQL Database overview

Connecting to a PostgreSQL Cloud Database

Outro

Intro

Spring Security Intro. Authentication, Authorization etc

Security Config Class

Setting up Security Config Class and testing authentication

Requestmatchers permitAll for public pages

Customizing UserDetailsService for Authentication

Creating an inmermory User and checking out bcrypt

Managing User Roles

Password encryption and hashing with bcrypt

Adding Password encryption and hashing with bcrypt

Logout, Sessions, Cookies and more

Implementing Logout to our demo

Security Vulnerabilities

Let's Practice: Employee Management System

Introduction to Spring Security

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Intro

Session Management Intro

Session Demo

Session Timeout Demo

State vs Stateless Authenticatin JWT, etc.

Stateless Authenticatin using JWT

JWT in Action with Postman and rundown of JwtUtil einschub

JWT in Action with Postman and rundown of JwtUtil

JwtAuthFilter rundown

Let's Practice: Casting Votes

JWT Authentication with Spring Security

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Intro

User Sign UP and Log in Intro

Setting up the H2 In Memory DB

Sign up controller and Service Intro

Sign up new user

Adding JWT to our Signup and login - Intro

Adding JWT to our Signup and login - demo

Login via database user data - demo

Day summary

Concepts Learned in Implementing User Sign-Up and Authentication

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Intro

Intro Security for our Expense tracker

Adding the SecurityConfig to our Expense Tracker

AuthController Overview

AuthController Implementation

JWTUtil class overview

JWTUtil class implementation

JWTAuthFilter intro

Setting up the AppUser, Repository and signup endpoint

Setting up the UserDetailServiceImpl

JwtFilter

Adding the Filter before Spring security authenticates

Creating the User Login Flow intro

Creating the AuthServiceImpl class

Separating the concerns

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Intro

Expense Tracker Final Touches RBAC intro

RBAC and middleware

Mapping Users to expenses Part 1

Mapping Users to expenses part - Part 2

Adjusting the Controller

Testing user-based database access

Implementing RBAC - Intro

Prepping UserRoles and hardcoding Admin

AdminService and AdminController

Future Scope

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Intro

Expense Tracker Authentication with JavaFX Intro

Setting up JavaFX Project and HTTPClient

Setting up MaterialFX

Setting up Login, Signup and Loading Views and Controllers

Setting up Preferences that hold the JWT Token

Moving between Login and Signup Scenes

Creating the HTTPResonse sendPostRequest method

Finalizing actual signup via our UI and creating the AuthService class

Adding the login feature

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About the Day

Creating the Main UI

Adding Fields to the Expense Table

Explaining the Edit and Delete buttons

Fetching Expenses from API

Handling Authentication Failure

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About the Day

Designing the Add Expense View

Handling Form Validations

Calling API to add expense

Updating the main screen

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Assignment! Practice your skills!

Connecting the Edit Expense view

Calling API to Edit expense

Showing Alert on Delete button press

Article: JavaFX Alerts

Calling delete API and updating the Main Screen

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Assignment! Practice your skills!

Creating the Statistics view

Fetching data from backend and updating stats

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Assignment! Practice your skills!

Uploading backend to github

Deploying the backend using Railway

Updating baseUrl in the User Interface

Final Touches

Building the jar file and sharing

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About the day

Introduction to threads

Creating and managing threads

Thread Synchronization

Thread Communication

Concurrency Utilities

Using Concurrent Collections

Avoiding common thread issues and Best pratices

Let´s Practice: Dining Philosophers

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About the Day

Swap 2 variables without using a 3rd variable

String Compression

Find the largest sum subarray

Rotate Array

Array Permutations

Top K frequent elements

Parking Lot Design

About the Day

Recap

LinkedList Cycle

Anagram Checker

Article: Binary Tree, Heap and PriorityQueue

Call Center Simulation

Understanding Graphs, BFS & DFS

URL Crawler

About the Day

Recap

Circular dependency with DI

Handling multiple Beans

Custom Error Handling

Answering advanced questions