Introduction to Threads and Concurrency | Learn Java from Scratch

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Learn Java from Scratch - A Beginner's Guide

By : In28Minutes Official

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Learn Java from Scratch - A Beginner's Guide

By: In28Minutes Official

Buy this Video

Overview of this book

This beginner-friendly course offers a structured and immersive path to mastering Java from the ground up. It begins with setting up Java across Windows, macOS, and Linux, then transitions to hands-on coding using JShell. Learners tackle real-world challenges like building multiplication tables to understand Java expressions, variables, and console output. With over 300 lessons, the course deeply explores loops, conditionals, methods, and object-oriented principles including classes, encapsulation, inheritance, abstraction, and polymorphism. As learners gain confidence, they move to Eclipse IDE to build structured Java projects. Core programming skills are reinforced through interactive exercises, puzzles, debug tips, and review checkpoints. The course covers primitive and reference types, arrays, ArrayLists, wrapper classes, exception handling, file operations, multi-threading, and concurrency tools. Advanced modules include Java Collections, Generics, Functional Programming with streams, lambda expressions, and method references. The course also explores modern Java features from versions 10 through 24, and introduces Spring Framework, Spring Boot, JPA, and REST API development. Extensive interview prep guides and real-world scenarios ensure learners are job-ready and confident in using Java professionally.

Introduction to Course – Java Programming

Introduction to the Course

Installing Java

Step 00 - Installing Java - Overview

Step 01 - Installing Java - Windows

Step 02 - Installing Java - Mac

Step 03 - Installing Java – Linux

Step 04 - Troubleshooting Java Installation

Introduction to Java Programming with JShell Using Multiplication Table

Step 00 – Step-By-Step Problem Solving with Programming

Step 01 - Introduction to Multiplication Table Challenge

Step 02 – Getting Started with JShell

Step 03 - Break Down Multiplication Table Challenge

Step 04 - Java Expression - an Introduction

Step 05 - Java Expression – Exercises

Step 06 - Java Expression – Puzzles

Step 07 - Printing Output to Console with Java

Step 08 - Printing Output to Console with Java - Exercise Statements

Step 09 - Printing Output to Console with Java - Exercise Solutions

Step 10 - Printing Output to Console with Java – Puzzles

JShell Tip - Multiple Lines of Code

Step 11 - Advanced Printing Output to Console with Java

Step 12 - Advanced Printing Output to Console with Java – Exercises

Step 13 - Introduction to Variables in Java

Step 14 - Introduction to Variables in Java - Exercises and Puzzles

Step 15 - 4 Important Things to Know about Variables in Java

Step 16 - How Are Variables Stored in Memory?

Step 17 - How to Name a Variable

Step 18 - Understanding Primitive Variable Types in Java

Step 19 - Understanding Primitive Variable Types in Java - Choosing a Type

Java Tip - String Concatenation

Step 20 - Java Assignment Operator

Step 21 - Java Assignment Operator - Puzzles on Increment, Decrement, and Compound

Step 22 - Programming Tips: JShell - Shortcuts, Multiple Lines, and Variables

Step 23 - Java Conditionals and If Statement – Introduction

Step 24 - Java Conditionals and If Statement - Exercise Statements

Step 25 - Java Conditionals and If Statement - Exercise Solutions

Step 26 - Java Conditionals and If Statement – Puzzles

Step 27 - Java For Loop to Print Multiplication Table – Introduction

Step 28 - Java For Loop to Print Multiplication Table - Exercise Statements

Step 29 - Java For Loop to Print Multiplication Table - Exercise Solutions

Step 30 - Java For Loop to Print Multiplication Table – Puzzles

Step 31 - Getting Started with Programming - Revise All Terminology

Introduction to Method with Multiplication Table

Step 00 - Section 02 - Methods - an Introduction

Step 01 - Your First Java Method - Hello World Twice and Exercise Statements

Step 02 - Introduction to Java Methods - Exercises and Puzzles

Step 03 - Programming Tip - Editing Methods with JShell

Step 04 - Introduction to Java Methods - Arguments and Parameters

Step 05 - Introduction to Java Method Arguments – Exercises

Step 06 - Introduction to Java Method Arguments - Puzzles and Tips

Step 07 - Getting Back to Multiplication Table - Creating a Method

Step 08 - Print Multiplication Table with a Parameter and Method Overloading

Step 09 - Passing Multiple Parameters to a Java Method

Step 10 - Returning from a Java Method - an Introduction

Step 11 - Returning from a Java Method – Exercises

Step 12 - Methods - Section Review

Introduction to the Java Platform

Step 00 - Section 03 - Overview of the Java Platform - Section Overview

Step 01 - Overview of the Java Platform - an Introduction - java, javac, bytecode

Step 02 - Java Class and Object - First Look

Step 03 - Create a Method in a Java Class

Step 04 - Create and Compile Planet.java Class

Step 05 - Run Planet Class with Java - Using a Main Method

Step 06 - Play and Learn with Planet Class

Step 07 - JDK Versus JRE Versus JVM

Introduction to Eclipse - First Java Project

Step 00 - Installing Eclipse - Windows

Step 00 - Installing Eclipse - Mac

Step 01 - Creating a New Java Project with Eclipse

Step 02 - Our First Java Class with Eclipse

Step 03 - Writing Multiplication Table Java Program with Eclipse

Step 04 - Adding More Methods for Multiplication Table Program

Eclipse Tip - Save Actions

Do Not Use Modules for Now

Step 05 - Programming Tip 1: Refactoring with Eclipse

Step 06 - Programming Tip 2: Debugging with Eclipse

Step 07 - Programming Tip 3: Eclipse Versus JShell - How to Choose

Introduction to Object-Oriented Programming

Step 00 - Introduction to Object-Oriented Programming - Section Overview

Step 01 - Introduction to Object-Oriented Programming – Basics

Step 02 - Introduction to Object-Oriented Programming - Terminology - Class Object

Step 03 - Introduction to Object-Oriented Programming - Exercise – Online Shopping

Step 04 - Create Motor Bike Java Class and a Couple of Objects

Step 05 - Exercise Solutions - Book Class and Three Instances

Step 06 - Introducing State of an Object with Speed Variable

Step 07 - Understanding Basics of Encapsulation with Setter Methods

Step 08 - Exercises and Tips - Getters and Generating Getters and Setters with E

Step 09 - Puzzles on This and Initialization of Member Variables

Step 10 - First Advantage of Encapsulation

Step 11 - Introduction to Encapsulation - Level 2

Step 12 - Encapsulation Exercises - Better Validation and Book Class

Step 13 - Introduction to Abstraction

Step 14 - Introduction to Java Constructors

Step 15 - Introduction to Java Constructors - Exercises and Puzzles

Step 16 - Introduction to Object-Oriented Programming – Conclusion

Primitive Data Types and Alternatives

Step 00 - Primitive Data Types in Depth - Section Overview

Step 01 - Basics about Java Integer Data Types - Casting, Operators, and More

Step 02 - Java Integer Data Types - Puzzles - Octal, Hexadecimal, Post- and Pre-Integer

Step 03 - Java Integer Data Types - Exercises - BiNumber - Add, Multiply, and Double

Step 04 - Java Floating Point Data Types - Casting, Conversion, and Accuracy

Step 05 - Introduction to BigDecimal Java Class

Step 06 - BigDecimal Puzzles - Adding Integers

Step 07 - BigDecimal Exercises - Simple Interest Calculation

Step 08 - Java Boolean Data Type - Relational and Logical Operators

Step 09 - Java Boolean Data Type - Puzzles - Short Circuit Operators

Step 10 - Java Character Data Type char - Representation and Conversion

Step 11 - Java char Data Type - Exercise 1 – isVowel

Step 12 - Java char Data Type - Exercise 2 – isDigit

Step 13 - Java char Data Type - Exercise 3 - isConsonant, List Upper Case, and L

Step 14 - Primitive Data Types in Depth – Conclusion

Conditionals

Step 00 - Conditionals with Java - Section Overview

Step 01 - Introduction to If Else Statement

Step 02 - Introduction to Nested If Else

Step 03 - If Else Statement – Puzzles

Step 04 - If Else Problem - How to Get User Input in Java?

Step 05 - If Else Problem - How to Get Number 2 and Choice from User?

Step 06 - If Else Problem - Implementing with Nested If Else

Programming Tip - CodingBat Dot Com

Step 07 - Java Switch Statement - an introduction

Step 08 - Java Switch Statement - Puzzles - Default, Break, and Fall Through

Step 09 - Java Switch Statement - Exercises - isWeekDay, nameOfMonth, nameOfDay

Step 10 - Java Ternary Operation - an Introduction

Step 11 - Conditionals with Java – Conclusion

Loops

Step 00 - Java Loops - Section Introduction

Step 01 - Java For Loop - Syntax and Puzzles

Step 02 - Java For Loop - Exercises Overview and First Exercise Prime Numbers

Step 03 - Java For Loop - Exercise - Sum Up to N Numbers and Sum of Divisors

Step 04 - Java For Loop - Exercise - Print a Number Triangle

Eclipse Tip - Templates - sysout, main, fore, ifelse

Step 05 - While Loop in Java - an Introduction

Step 06 - While Loop - Exercises - Cubes and Squares Up to Limit

Step 07 - Do While Loop in Java - an Introduction

Step 08 - Do While Loop in Java - an Example - Cube While User Enters Positive n

Step 09 - Introduction to Break and Continue

Step 10 - Selecting Loop in Java - For Versus While Versus Do While

Reference Types

Step 00 - Java Reference Types - Section Introduction

Step 01 - Reference Types - How Are they Stored in Memory?

Step 02 - Java Reference Types – Puzzles

Step 03 - String Class - Introduction and Exercise - Print Each Word and Char On

Step 04 - String Class - Exercise Solution and Some More Important Methods

Step 05 - Understanding String Is Immutable and String Concat, Upper Case, Lower

Step 06 - String Concatenation and Join, Replace Methods

Step 07 - Java String Alternatives - StringBuffer and StringBuilder

Step 08 - Java Wrapper Classes - an Introduction - Why and What?

Step 09 - Java Wrapper Classes - Creation - Constructor and valueOf

Step 10 - Java Wrapper Classes - Auto Boxing and a Few Wrapper Constants – SIZE

Step 11 - Java Dates - Introduction to LocalDate, LocalTime, and LocalDateTime

Step 12 - Java Dates - Exploring LocalDate - Creation and Methods to Play with D

Step 13 - Java Dates - Exploring LocalDate - Comparing Dates and Creating Specif

Eclipse Tip - Exploring Java API

Step 14 - Java Reference Types – Conclusion

Arrays and ArrayLists

Step 00 - Introduction to Array and ArrayList - Section Introduction with a Challenge

Step 01 - Understanding the Need and Basics about an Array

Step 02 - Java Arrays - Creating and Accessing Values – Introduction

Step 03 - Java Arrays - Puzzles - Arrays of Objects, Primitive Data Types, toStr

Step 04 - Java Arrays - Compare, Sort, and Fill

Step 05 - Java Arrays - Exercise - Create Student Class - Part 1 - Total and Ave

Step 06 - Java Arrays - Exercise - Create Student Class - Part 2 - Maximum and Minimum

Step 07 - Introduction to Variable Arguments – Need

Step 08 - Introduction to Variable Arguments – Basics

Step 09 - Introduction to Variable Arguments - Enhancing Student Class

Step 10 - Java Arrays - Using Person Objects and String Elements with Exercises

Eclipse Tip - Code Generation

Step 11 - Java String Arrays - Exercise Solutions - Print Day of Week with Most

Step 12 - Adding and Removing Marks - Problem with Arrays

Step 13 - First Look at ArrayList - an Introduction

Step 14 - First Look at ArrayList - Refactoring Student Class to Use ArrayList

Step 15 - First Look at ArrayList - Enhancing Student Class with Add and Remove

Step 16 - Array and ArrayList – Conclusion

Object-Oriented Programming Again

Step 00 – Object-Oriented Programming - Level 2 - Section Introduction

Step 01 - Basics of Designing a Class - Class, Object, State, and Behavior

Step 02 - OOP Example - Fan Class - Deciding State and Constructors

Step 03 - OOP Example - Fan Class - Deciding Behavior with Methods

Step 04 - OOP Exercise - Rectangle Class

Step 05 - Understanding Object Composition with Customer Address Example

Step 06 - Understanding Object Composition - an Exercise - Books and Reviews

Step 07 - Understanding Inheritance - Why Do We Need It?

Step 08 - Object Is at Top of Inheritance Hierarchy

Step 09 - Inheritance and Overriding with toString() Method

Step 10 - Java Inheritance - Exercise - Student and Employee Classes

Step 11 - Java Inheritance - Default Constructors and super() Method Call

Step 12 - Java Inheritance - Puzzles - Multiple Inheritance, Reference Variables

Step 13 - Java Abstract Class – Introduction

Step 14 - Java Abstract Class - First Example - Creating Recipes with Template M

Step 15 - Java Abstract Class – Puzzles

Step 16 - Java Interface - Example 1 - Gaming Console - How to Think about Intef

Step 17 - Java Interface - Example 2 - Complex Algorithm - API Defined by extern

Step 18 - Java Interface - Puzzles - Unimplemented methods, Abstract Classes, Values

Step 19 - Java Interface Versus Abstract Class - a Comparison

Step 20 - Java Interface Flyable and Abstract Class Animal - an Exercise

Programming Tip - 97 Things Every Programmer Should Know

Step 21 - Polymorphism - an Introduction

Collections

Step 01 - Java Collections - Section Overview with Need for Collections

Step 02 - List Interface - Introduction - Position Is King

Step 03 - List Interface - Immutability and Introduction of Implementations – Array

Step 04 - List Interface Implementations - ArrayList Versus LinkedList

Programming Tip - Teach Yourselves Programming in 10 Years

Step 05 - List Interface Implementations - ArrayList Versus Vector

Step 06 - List Interface - Methods to Add, Remove, and Change Elements and Lists

Step 07 - List and ArrayList - Iterating Around Elements

Step 08 - List and ArrayList - Choosing Iteration Approach for Printing and Delete

Step 09 - List and ArrayList - Puzzles - Type Safety and Removing Integers

Step 10 - List and ArrayList - Sorting - Introduction to Collections Sort Static

Step 11 - List and ArrayList - Sorting - Implementing Comparable Interface

Step 12 - List and ArrayList - Sorting - Providing Flexibility by Implementing Comparator

Step 13 - List and ArrayList - a Summary

Step 14 - Set Interface - Introduction - No Duplication

Step 15 - Understanding Data Structures - Array, LinkedList, and Hashing

Step 16 - Understanding Data Structures - Tree - Sorted Order

Step 17 - Set Interface – Hands-On - HashSet, LinkedHashSet and TreeSet

Step 18 - Set Interface - Exercise - Find Unique Characters in a List

Step 19 - TreeSet - Methods from NavigableSet - floor, lower, upper, subSet, head

Step 20 - Queue Interface - Process Elements in Order

Step 21 - Introduction to PriorityQueue - Basic Methods and Customized Priority

Step 22 - Map Interface - an Introduction - Key and Value

Step 23 - Map Interface - Implementations - HashMap, HashTable, LinkedHashMap

Step 24 - Map Interface - Basic Operations

Step 25 - Map Interface - Comparison - HashMap Versus LinkedHashMap Versus TreeMap

Step 26 - Map Interface - Exercise - Count Occurrences of Characters and Words

Step 27 - TreeMap - Methods from NavigableMap - floorKey, higherKey, firstEntry

Step 28 - Java Collections - Conclusion with Three Tips

Generics

Step 01 - Introduction to Generics - Why Do We Need Generics?

Step 02 - Implementing Generics for the Custom List

Step 03 - Extending Custom List with a Generic Return Method

Step 04 - Generics Puzzles - Restrictions with Extends and Generic Methods

Step 05 - Generics and WildCards - Upper Bound and Lower Bound

Introduction to Functional Programming

Step 01 - Introduction to Functional Programming - Functions Are First Class

Step 02 - Functional Programming - First Example with Function as Parameter

Step 03 - Functional Programming - Exercise - Loop a List of Numbers

Step 04 - Functional Programming - Filtering - Exercises to Print Odd and Even n

Step 05 - Functional Programming - Collect - Sum of Numbers in a List

Step 06 - Functional Programming Versus Structural Programming - a Quick Comparison

Step 07 - Functional Programming Terminology - Lambda Expression, Stream, and Operations

Step 08 - Stream Intermediate Operations - Sort, Distinct, Filter, and Map

Step 09 - Stream Intermediate Operations - Exercises - Squares of First 10, Map

Step 10 - Stream Terminal Operations - 1 - Max Operation with Comparator

Step 11 - Stream Terminal Operations - 2 - Min, Collect To List

Step 12 - Optional Class in Java - an Introduction

Step 13 - Behind the Screen with Functional Interfaces - Implement Predicate Int

Step 14 - Behind the Screen with Functional Interfaces - Implement Consumer Int

Step 15 - Behind the Screen with Functional Interfaces - Implement Function Int

Step 16 - Simplify Functional Programming Code with Method References

Step 17 - Functions Are First-Class Citizens

Step 18 - Introduction to Functional Programming – Conclusion

Introduction to Threads and Concurrency

Step 01 - Introduction to Threads and Multi-Threading - Need for Threads

Step 02 - Creating a Thread for Task 1 - Extending Thread Class

Step 03 - Creating a Thread for Task 2 - Implement Runnable Interface

Step 04 - Theory - States of a Thread

Step 05 - Placing Priority Requests for Threads

Step 06 - Communication between Threads - join Method

Step 07 - Thread Utility Methods and Synchronized Keywords - Sleep, Yield

Step 08 - Need for Controlling the Execution of Threads

Step 09 - Introduction to Executor Service

Step 10 - Executor Service - Customizing Number of Threads

Step 11 - Executor Service - Returning a Future from Thread Using Callable

Step 12 - Executor Service - Waiting for Completion of Multiple Tasks Using invokeAny

Step 13 - Executor Service - Wait for Only the Fastest Task Using invokeAny

Step 14 - Threads and Multi-Threading – Conclusion

Introduction to Exception Handling

Step 01 - Introduction to Exception Handling - Your Thought Process During Exception

Step 02 - Basics of Exceptions - NullPointerException and StackTrace

Step 03 - Basics of Handling Exceptions - try and catch

Step 04 - Basics of Handling Exceptions - Exception Hierarchy, Matching, and Catch

Step 05 - Basics of Handling Exceptions - Need for finally

Step 06 - Basics of Handling Exceptions – Puzzles

Step 07 - Checked Exceptions Versus Unchecked Exceptions - an Example

Step 08 - Hierarchy of Errors and Exceptions - Checked and Runtime

Step 09 - Throwing an Exception - Currencies Do Not Match Runtime Exception

Step 10 - Throwing a Checked Exception - Throws in Method Signature and Handling

Step 11 - Throwing a Custom Exception – CurrenciesDoNotMatchException

Step 12 - Write Less Code with Try with Resources - New Feature in Java 7

Step 13 - Basics of Handling Exceptions - Puzzles 2

Step 14 - Exception Handling - Conclusion with Best Practices

Eclipse Tip – Ctrl or Cmd + 1

Files and Directories

Step 01 - List Files and Folders in Directory with Files List Method

Step 02 - Recursively List and Filter All Files and Folders in Directory

Step 03 - Read Content from a File - Files readAllLines and Lines Methods

Step 04 - Writing Content to a File - Files Write Method

Step 05 - Files – Conclusion

More Concurrency with Concurrent Collections and Atomic Operations

Step 01 - Getting Started with Synchronized

Step 02 - Problem with Synchronized - Less Concurrency

Step 03 - Enter Locks with ReEntrantLock

Step 04 - Introduction to Atomic Classes – AtomicInteger

Step 05 - Need for ConcurrentMap

Step 06 - Implementing an Example with ConcurrentHashMap

Step 07 - ConcurrentHashMap Uses Different Locks for Different Regions

Step 08 - CopyOnWrite Concurrent Collections - When Reads Are More Than Writes

Step 09 – Conclusion

Java Tips

Java Tip 01 - Imports and Static Imports

Java Tip 02 – Blocks

Java Tip 03 - Equals Method

Java Tip 04 - hashcode Method

Java Tip 05 - Class Access Modifiers - Public and Default

Java Tip 06 - Method Access Modifiers - Public, Protected, Private, and Default

Java Tip 07 - Final Classes and Final Methods

Java Tip 08 - Final Variables and Final Arguments

Java Tip 09 - Why Do We Need Static Variables?

Java Tip 09 - Why Do We Need Static Methods?

Java Tip 10 - Static Methods Cannot Use Instance Methods or Variables

Java Tip 11 - Public Static Final – Constants

Java Tip 12 - Nested Classes - Inner Class Versus Static Nested Class

Java Tip 13 - Anonymous Classes

Java Tip 14 - Why Enum and Enum Basics - Ordinal and Values

Java Tip 15 - Enum - Constructor, Variables, and Methods

Java Tip 16 - Quick Look at Inbuilt Enums - Month, DayOfWeek

New Course Additions – an Overview

Step 00 - New Course Additions - an Overview

Java New Features - Java 10 to Java 24

Step 01 - Understanding Java Versions - 10000 Feet Overview

Step 02 - Understanding Java New Features - An Overview

Step 03 - Getting Started with Java Modularization

Step 04 - Java Modularization - 01 - Building Service and Consumer

Step 05 - Java Modularization - 02 - Splitting Service and Consumer into JARs

Step 06 - Java Modularization - 03 - Splitting Service and Consumer into Modules

Step 07 - Java Modularization - 04 - A Quick Review

Step 08 - Exploring New Java API - List Set and Map - copyOf methods

Step 09 - Exploring New Java API - Files - readString and writeString methods

Step 10 - Exploring New Java API - Predicate - not method

Step 11 - Exploring New Java API - String Utility Methods

Step 12 - Exploring Java New Features - Local Variable Type Inference

Step 13 - Exploring Java New Features - Switch Expression

Step 14 - Exploring Java New Features - Text Blocks

Step 15 - Exploring Java New Features - Records

Step 16 - Understanding Sealed Class and Interface - Java 17

Step 17 - Exploring Java Platform Threads

Step 18 - What are Virtual Threads - Java 21

Step 19 - Exploring Sequenced Collections - Java 21

Step 20 - Exploring SequencedSet and SequencedMap - Java 21

Step 21 - Pattern Matching with Variable Declaration - Java 14

Step 22 - Pattern Matching with Records - Java 21

Step 23 - Pattern Matching with Nested Records - Java 21

Step 24 - Switch with Enums - Java 17

Step 25 - Switch with Record Patterns - Java 21

Step 26 - Getting Started with Stream Gatherers - Java 24

Java Review (Interview) Guide - Getting Started

Java Interview and Review Guide - Introduction

Java Platform - Java Review (Interview) Guide

Section Introduction - Java Platform

What is Platform Independence

Platform Independence vs Portability

Code vs Machine Code vs Bytecode

Major events in programming history that led to Java

JDK vs JVM vs JRE

Static vs Dynamic Programming Languages

How JVM is Reused by Other Programming Languages & Advantages

What is CLASSPATH

What is the role for a classloader in Java

Types of Java Class Loaders

ClassLoader Delegation Model - Parent Child Hierarchy

ClassLoader Delegation Model - Prevent system classes from getting overridden

Compilation vs Interpretation

Is Java Compiled or Interpreted

Advanced Concepts Alert - JIT Compilation and more

Java Performance Optimization - in spite of Interpretation

What is Just In Time (JIT) Compilation

Give a few examples of optimizations performed by Java

Why does Java NOT do all optimizations at compile time

Java Landscape - Java Review (Interview) Guide

Section Introduction - Java Landscape

Who owns Java

Java SE vs Java EE vs Java ME

How has Java evolved over the last few decades

What is a JAR file

Oracle JDK vs Amazon Corretto vs OpenJDK vs GraalVM

What is JCP

JSR vs JEP

Java Release Numbering

When are new Java versions released

Long Term Support (LTS) vs Non LTS Releases

Why Java is Still Popular

Java Memory Management - Java Review (Interview) Guide

Section Introduction - Java Memory Management

How is Java different from C, C++ - memory management

What is a Memory Leak

How does Garbage Collection work

Memory Spaces in Java

Comparison Stack vs Heap Memory

Advanced Concepts Alert - Garbage Collection and more

Why is GC Complex?

Reference Counting vs Mark & Sweep

What Are Generations in Java Garbage Collection

What is Stop the World (STW) GC

Types of Garbage Collectors in Java

Customization Options for Garbage Collection

Why is finalize Method Deprecated in Java 9

Java Uses Call by Value

Java Object Oriented Concepts - Java Review (Interview) Guide

Section Introduction - Java Object Oriented Programming Concepts

Structured vs Object Oriented Programming

Class vs Object vs State vs Behavior

Object Lifecycle

Why is Java NOT 100 Percent Object Oriented

Running Examples - We made it easy - Inheritance and more..

Inheritance vs Abstract Class vs Interface

Design Choices in Java Collections - Interface, Inheritance, and Abstract Class

What are Design Patterns

What is Dependency Injection

Explain a few different scenarios of using Interfaces in Java

Give different usecases for inheritance in Java

What is Encapsulation

Advantages of Encapsulation

Encapsulation vs Security

Explain Encapsulation in Java Using ArrayList as an example

What is Abstraction

What is Cohesion

What is Coupling

How to Reduce Coupling in Java

Abstraction vs Coupling vs Cohesion vs Encapsulation

Favor Composition Over Inheritance

What is Polymorphism

What is Dynamic Method Dispatch

Static vs Dynamic Binding

What is the need for Sealed Interfaces and Classes

Java Object Oriented Programming Details - Java Review (Interview) Guide

Section Introduction - Java Object Oriented Programming Details

Object - superclass of every class in Java

Best practices in implementing the toString method

Best practices in implementing the equals method

Best practices in implementing the hashCode method

Discuss Some of the Important Ways to Initialize Objects in Java

How does the default constructor work in Java

Why is a copy constructor needed

What is the need for a private constructor

super() vs this() vs super vs this

How Do Default Methods Help in Achieving Backward Compatibility

When do you use a Marker Interface in Java

Different Types of Inner Classes in Java

Reference variable vs Primitive variable

Core Java in Depth - Java Review (Interview) Guide

Section Introduction - Core Java in Depth

Why are Wrapper Classes Needed

Best Practices in Using Wrapper Classes

How does Java optimize memory usage with Integer - valueOf

Why Are Wrapper Classes in Java Immutable

String vs StringBuffer vs StringBuilder

Why Are String Classes in Java Immutable

How do Text Blocks Help

What is a String Pool

How Does intern method Work

Take Care when comparing Strings

Best Practices with Conditionals

Best Practices with Loops

Best Practices with Using Arrays

Local Variable Type Inference - Java 10

Records improve the conciseness of Java code

Best practices with Records

Key things to be careful about when using Records

Functional Programming - Java Review (Interview) Guide

Section Introduction - Functional Programming in Java

Functional Programming vs Imperative Style

Core concepts of Functional Programming

Different ways to create Streams in Java

Java Stream Operations

Things to Remember About Java Streams

Examples of Lambda Functions

Method References vs Lambda Functions

Functional Interfaces with examples

Advanced Concepts Alert - Functional Programming

Key Functional Interfaces and how do they work

Why were Primitive Functional Interfaces Introduced

When Do You Use Collectors groupingBy method

Optional class - Handle missing values

Parallel Streams - Enhance performance in Java

Functional Programming - Simplify Java code

Higher Order Functions vs Behavior Parameterization vs First Class Functions

Benefits of using Functional Programming

Threads and Concurrency - Java Review (Interview) Guide

Section Introduction - Threads and Concurrency in Java

Sequential vs Concurrent vs Parallel Execution

Extending Thread vs implementing Runnable

Using Callable instead of Runnable

Thread Methods - join vs sleep vs yield

What are the different states of a Thread

How to change Thread priority

Operating System Processes vs Operating System Threads

Why did Java introduce Virtual Threads

What is the need for pooling Threads

Different options of creating an ExecutorService

Advanced Concepts Alert - Race Conditions and Thread Safety

Thread Safety vs Race Conditions

Solving Race Conditions in Java - synchronized

Solving Race Conditions in Java - Locks

Solving Race Conditions in Java - Atomic Variables

Solving Race Conditions in Java - Concurrent Collections

Locks vs Synchronized Approach

When do you use ThreadLocal

When do you use a Semaphore

When do you use a CountDownLatch

Object Methods - Inter Thread Communication

Why do Deadlocks occur

Discuss an option to solve above deadlock

ExecutorService vs ForkJoinPool

Enhancing parallelization of code using Streams

Collections - Java Review (Interview) Guide

Section Introduction - Collections in Java

How did the Collections Framework Evolve in Java

Why are Collections needed in Java

10000 feet overview of interfaces in collection framework

Key methods in the Collection interface

Key methods in the SequencedCollection interface

Key methods in the List interface

How do you decide which List implementation to use

How do you choose the right approach to sort a List

Key interfaces associated with Set operations

How do you decide which Set implementation to use

What are the main interfaces related to Queue

What are the important implementations of Queue

What are the key interfaces related to Map

What are the key implementations of Map Interface

What is the purpose of the Collections class

Synchronized vs Concurrent Collections

CopyOnWrite approach in Concurrent Collections

Compare And Swap (CAS) approach

When does Java Collection throw UnsupportedOperationException

Fail Fast vs Fail Safe Iterators

Best practices with using Collections in Java

Why are Sequenced Collections introduced

Generics - Java Review (Interview) Guide

Section Introduction - Generics in Java

Why Do We Need Generics in Java

Generic Class vs Generic Method

How Are Generics Actually Used in the JDK

What Is Type Erasure

Restrict Types Using Generics in Java

Modifiers - Java Review (Interview) Guide

Section Introduction - Modifiers in Java

Different Access Modifiers in Java

Best Practices with static Modifier in Java

Best Practices with final Modifier in Java

Best Practices with abstract Modifier in Java

Other Useful Modifiers in Java With Examples

Exception Handling - Java Review (Interview) Guide

Section Introduction - Exception Handling in Java

Why is Exception Handling Important

Which Design Pattern Powers Java Exception Flow

Practical Example of Java Exception Handling

What Happens When You Swallow Exceptions

When is Code in finally Not Executed

Combinations of try, catch, and finally

Class Hierarchy Behind Java Exceptions

Checked vs Unchecked Exceptions in Java

What Are Chained Exceptions

Best Practices for Handling Exceptions in Java

Newer Java Features That Help with Exception Handling

Serialization - Java Review (Interview) Guide

Section Introduction - Serialization in Java

What is Serialization

Running Examples - We made it easy - Serialization

How to Serialize an Object

How to Deserialize an Object

Exclude Specific Parts from Serialization

Are Constructors Invoked During Deserialization

What is serialVersionUID

What is Externalizable

Built-in Classes - Java Review (Interview) Guide

Section Introduction - Built in Classes in Java

Object Class in Java

Void Class in Java

Runtime Class in Java

System Class in Java

ThreadLocal Class in Java

UUID Class in Java

Files Class in Java

Timer Class in Java

Locale Class in Java

Miscellaneous Topics - Java Review (Interview) Guide

Section Introduction - Miscellaneous Topics in Java

Best practices for using enums in Java

When should you use an EnumSet

Purpose of using assertions in Java

Variable arguments (varargs) in a method

Best practices with date and time APIs in Java

What is the Use of Reflection

Why are annotations used in Java

Custom annotation in Java

Unnamed variables and patterns

Pattern matching Evolution across Java versions

Switch expressions Evolution across Java versions

New Features - Java Review (Interview) Guide

Section Introduction - New Features in Java

How is Java Marching Forward

Primary goals behind recent Java releases

Important Java versions and most important features

Java Interview and Review Guide - Thank You

Getting Started with Java Spring Framework

Step 01 - Understanding the Need for Java Spring Framework

Step 02 - Getting Started with Java Spring Framework

Step 03 - Creating a New Spring Framework Project with Maven and Java

Step 03z - Quick Intro to Spring Initializr and Maven

Step 04 - 01 - Getting Started with Java Gaming Application

Step 04 - 02 - Adding Buttons to Our Spring Gaming App

Step 04 - 03 - Introduction to var - Java 10 New Feature

Step 05 - Understanding Loose Coupling and Tight Coupling

Step 06 - 01 - Introducing Java Interface to Make App Loosely Coupled

Step 06 - 02 - Code Review - Introducing Java Interface to Spring App

Step 06 - 03 - Exercise - Adding Pacman Game

Step 07 - Bringing in Spring Framework to Make Java App Loosely Coupled

Step 08 - 01 - Launching Java Spring Configuration

Step 08 - 02 - Your First Java Spring Bean

Step 08 - 03 - Code Review - Java Spring Configuration and Spring Bean

Step 09 - Creating More Java Spring Beans in Spring Java Configuration File

Step 10 - 01 - Implementing Auto Wiring in Spring Framework Java Configuration

Step 10 - 02 - Reusing Existing Spring Beans for Auto Wiring

Step 10 - 03 - Code Review - Auto Wiring in Spring using Method Calls and Method

Step 11 - Questions about Spring Framework - What will we learn?

Step 12 - Understanding Spring IOC Container: Application Context & Bean Factory

Step 13 - Exploring Java Bean vs POJO vs Spring Bean

Step 14 - 01 - Exploring Spring Framework Bean Auto Wiring

Step 14 - 02 - Exploring Spring Framework Primary and Qualifier Annotations

Step 15 - 01 - Using Spring Framework to Manage Beans for Java Gaming App

Step 15 - 02 - Using Spring Framework to Manage Beans for Java Gaming App

Step 15 - 03 - Code Review - Spring Managed Beans for Java Gaming App

Step 16 - More Questions about Java Spring Framework - What will we learn?

Step 17 - Exploring Spring Framework With Java - Section 1 - Review

Using Spring Framework to Create and Manage Your Java Objects

Step 01 - 01 - Getting Spring Framework to Create and Manage Your Java Objects

Step 01 - 02 - Getting Spring Framework to Create Beans using @Component

Step 01 - 03 - Exercise - Playing with Spring Framework

Step 01 - 04 - Code Review - Spring Creating and Managing Spring Beans

Step 02 - Exploring Primary and Qualifier Annotations for Spring Components

Step 03 - Primary and Qualifier - Which Spring Annotation Should You Use?

Step 04 - 01 - Exploring Spring Framework - Different Types of Dependency

Step 04 - 02 - Getting Started with Field Injection

Step 04 - 03 - Exploring Setter and Constructor Injection

Step 05 - Java Spring Framework - Understanding Important Terminology

Step 06 - Java Spring Framework - Comparing @Component vs @Bean

Step 07 - Why do we have dependencies in Java Spring Applications?

Step 08 - Exercise: Solution for Real World Java Spring Framework Example

Step 09 - Exploring Spring Framework With Java - Section 2 - Review

Exploring Spring Framework Advanced Features

Step 01 - Exploring Lazy and Eager Initialization of Spring Framework Beans

Step 02 - Comparing Lazy Initialization Versus Eager Initialization

Step 03 - Exploring Java Spring Framework Bean Scopes - Prototype and Singleton

Step 04 - Comparing Prototype Versus Singleton - Spring Framework Bean Scopes

Step 05 - Exploring Spring Beans - PostConstruct and PreDestroy

Step 06 - Evolution of Jakarta EE - Comparing with J2EE and Java EE

Step 07 - Exploring Jakarta CDI with Spring Framework and Java

Step 08 - Exploring Java Spring XML Configuration

Step 09 - Java Annotations Versus XML Configuration for Java Spring Framework

Step 10 - Exploring Spring Framework Stereotype Annotations - Component and more

Step 11 - Quick Review - Important Spring Framework Annotations

Step 12 - Quick Review - Important Spring Framework Concepts

Step 13 - Exploring Spring Big Picture - Framework, Modules, and Projects

Getting Started with Spring Boot

Step 01 - Getting Started with Spring Boot – Goals

Step 02 - Setting Up New Spring Boot Project with Spring Initializer

Step 03 - Build a Hello World API with Spring Boot

Step 04 - Understanding the World before Spring Boot – 10,000 Feet Overview

Step 05 - Understanding Spring Boot Magic - Spring Boot Starter Projects

Step 06 - Understanding Spring Boot Magic - Autoconfiguration

Step 07 - Playing with Spring Boot

Step 08 - Understanding Spring Boot Magic - Embedded Servers

Step 09 - Exploring Spring Boot Actuator

Step 10 - Exploring Spring Boot DevTools

Step 11 - Understanding Spring Boot Versus Spring Versus Spring MVC

Step 12 - Getting Started with Spring Boot - Review

Getting Started with JUnit

Step 01 - What is JUnit and Unit Testing

Step 02 - Your First JUnit Project and Green Bar

Step 03 - Your First Code and First Unit Test

Step 04 - Exploring Other Assert Methods

Step 05 - Exploring Few Important JUnit Annotations

Getting Started with Maven

Step 01 - Introduction to Maven

Step 02 - Creating a Spring Boot Project with Maven

Step 03 - Exploring Maven pom.xml for Spring Boot Project

Step 04 - Exploring Maven Parent Pom for Spring Boot Project

Step 05 - Exploring Maven Further

Step 06 - Exploring Maven Build Lifecycle with a Spring Boot Project

Step 07 - How Does Maven Work?

Step 08 - Playing with Maven Commands

Step 09 - How Are Spring Projects Versioned?

Getting Started with JPA and Hibernate

Step 01 - Getting Started with JPA and Hibernate - Goals

Step 02 - Setting up New Spring Boot Project for JPA and Hibernate

Step 03 - Launching H2 Console and Creating Course Table in H2

Step 04 - Getting Started with Spring JDBC

Step 05 - Inserting Hardcoded Data Using Spring JDBC

Step 06 - Inserting and Deleting Data Using Spring JDBC

Step 07 - Querying Data Using Spring JDBC

Step 08 - Getting Started with JPA and EntityManager

Step 09 - Exploring the Magic of JPA

Step 10 - Getting Started with Spring Data JPA

Step 11 - Exploring Features of Spring Data JPA

Step 12 - Understanding Difference Between Hibernate and JPA

Simple REST API with Spring Boot and Spring Data JPA

Step 01 - Getting Started - Simple REST API with Spring Boot and Spring Data JPA

Step 02 - Integrating Spring Boot with Data JPA and In-Memory Database H2

Step 03 - JDBC to Spring JDBC to JPA to Spring Data JPA – 10,000 Feet Overview

Step 04 - Mapping Course Entity and Populating Data with Data Using SQL

Step 05 - Creating Repository to Manage Entity and Integrating with GET REST API

Step 06 - Understanding REST API – 10,000 Feet Overview

Step 07 - Building REST API to Retrieve Details of a Course – GET

Step 08 - Building REST API to Create a New Course – POST

Step 09 - Building REST API to Update a Course – PUT

Step 10 - Building REST API to Delete a Course – DELETE

Step 11 - Optional Hands-On - Using Docker to Launch MySQL - an Overview

Step 12 - Optional Hands-On - Installing Docker

Step 13 - Optional Hands-On - Using Docker to Launch MySQL

Congratulations

Congratulations!

Appendix - Troubleshooting Eclipse and Java

Troubleshooting Eclipse - Configuring Java JDK

Using Latest Java Version with Latest Eclipse

Getting Eclipse 2021 03 Working with JDK 16

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Learn Java from Scratch - A Beginner's Guide

By : In28Minutes Official

Learn Java from Scratch - A Beginner's Guide

By: In28Minutes Official

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