Grokking Java Intermediate

Name: Grokking Java Intermediate
Price: 48 USD
Availability: InStock
Rating: 4.7 (148 reviews)

Learn object-oriented Java, generics, and the collections framework, then regex, file handling, and multithreading, with runnable code in every lesson.

Level:

Intermediate

Study Time:

12h

Lessons:

102

Playgrounds:

150

Assessments:

Updated

Yesterday

4.7

(148 ratings)

1,165 learners

Created byArslan Ahmad

Ex FAANG Manager, Expert Behind Grokking Java Intermediate

Course Overview

Grokking Java Intermediate teaches how real Java programs are organized. It starts where Grokking Java Basics ends. You will learn object-oriented programming from the ground up: classes, objects, constructors, encapsulation, inheritance, polymorphism, abstraction, and interfaces. The course then covers Java core classes, generics, and the collections framework, including lists, sets, queues, and maps. It ends with regular expressions, file handling, and multithreading. Every lesson includes code that you can edit and run in the browser, and each chapter ends with a quiz. The course is for learners who know Java syntax and want to write well-structured programs. If you are new to Java, take Grokking Java Basics first. The course does not cover the Stream API, databases, or web frameworks like Spring. By the end, you will be able to design classes, choose the right collection for a task, and read the kind of Java found in real projects.

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This course

Lifetime access to this course

One-time payment. Yours forever.

All 60 courses

Annual plan

Discussions

Certificate

Free updates

Own everything, once

What you'll learn in Grokking Java Intermediate

Model real data with classes and objects, member variables, and methods, the core of object-oriented Java.
Use the this and static keywords correctly, and know when a variable or method belongs to the class.
Reuse code with inheritance and the super keyword in single, multilevel, and hierarchical class trees.
Design with abstract classes and interfaces, and get multiple inheritance of behavior through interfaces.
Write type-safe code with generic methods, generic classes, and bounded types, and see how generics work at runtime.
Order elements with the Comparator interface and walk through any collection with an iterator.
Create, read, write, and delete files, and run tasks concurrently with threads and synchronization.

Initialize objects with default, parameterized, overloaded, and copy constructors, and chain them with this.
Protect data with packages, access modifiers, and encapsulation.
Write flexible code with method overloading, method overriding, and runtime polymorphism.
Use Java core classes: Object, the utility classes, the date and time classes, and the wrapper classes.
Choose the right collection: ArrayList, LinkedList, HashSet, TreeSet, PriorityQueue, ArrayDeque, HashMap, and TreeMap.
Match and extract text with regular expressions using the Pattern and Matcher classes.

Course Content

• 17 Chapters • 102 Lessons

Introduction

1 lesson

Course Overview

Object-Oriented Programming Basics

6 lessons

Introduction to Object-Oriented Programming

Creating Our First Class

Creating Our First Class Method

Creating the Object of the Class

Using Member Variables

Quiz

Constructors in Java

5 lessons

Understanding the Constructor and Default Constructor

Parameterized Constructor

Constructor Overloading

Copy Constructor

Quiz

The this and static Keywords in Java

7 lessons

The 'this' Keyword

Constructor Chaining By Using this Keyword

Other Use Cases of this Keyword

Static Variables

Static Methods

Can Non-Static Methods Be Called From a Static Method?

Quiz

Encapsulation in Java

4 lessons

Java Package

Access Modifiers in Action

Encapsulation in Java

Quiz

Inheritance in Java

8 lessons

Introduction to Inheritance in Java

Single Level Inheritance

Super Keyword

Access Modifiers and Inheritance

Multilevel Inheritance

Hierarchical Inheritance

Hybrid Inheritance

Quiz

Polymorphism in Java

4 lessons

Introduction to Polymorphism

Method Overloading

Method Overriding

Quiz

Abstraction and Interfaces in Java

6 lessons

Introduction to Abstraction in Java

Java Interface

Class vs. Interface

Multiple Inheritance Through Interfaces

Nested Interfaces

Quiz

Java Predefined Classes

6 lessons

Introduction to Java’s Core Classes

Exploring the Object Class

Utility Classes in Java

Date and Time Classes in Java

Wrapper Classes in java

Quiz

10.

Java Generics

6 lessons

Introduction to Generics

Generic Methods

Generic Classes

Bounded type parameters

How generics work at runtime

Quiz

11.

Lists in Java Collections

10 lessons

Introduction to the Collection Framework in Java

Overview of List Interface

Basic overview of ArrayList Class

ArrayList Operations

Understanding the Comparator Interface

Basic Overview of Vector Class

Basic Overview of Stack Class

Basic Overview of LinkedList Class

Iterators in Java

Quiz

12.

Sets in Java Collections

7 lessons

Overview of Set Interface

Basics of HashSet Class

HashSet: Operations

Iterating Over HashSet

Basics of TreeSet Class

TreeSet Class With Custom Comparator

Quiz

13.

Queue in Java Collections

4 lessons

Basics of Queue

PriorityQueue Class

ArrayDeque Class

Quiz

14.

Maps in Java

8 lessons

Overview of Map Interface

Basics of HashMap Class

HashMap: Operations

Iterating HashMap

How HashMap Works Internally

How a HashMap turns a key into a bucket index, handles collisions, resizes its table, and depends on equals() and hashCode().

Basics of LinkedHashMap Class

Basics of TreeMap Class

Quiz

15.

Java Regex

4 lessons

Introduction to Regular Expressions in Java

Pattern Class in Java

Matcher Class in Java

Quiz

16.

Java File Handling

7 lessons

Introduction to File Handling in Java

Java Program to Create a New File

Reading a File in Java

Writing to a File in Java

Delete a File in Java

Java FilePermission Class

Quiz

17.

Java Multithreading

9 lessons

Introduction to Threads in Java

Java Thread Class

Java Runnable Interface

Lifecycle and States of a Thread in Java

Basics of Thread Synchronization

Java Thread Priority

Design Patterns Related to Thread Synchronization

ConcurrentHashMap Internals

How ConcurrentHashMap reads without locks, writes with CAS and per-bucket locks, resizes during use, and supports atomic compound updates.

Quiz

What people say about our courses

Eric

Software Engineer

I've completed my first pass of "grokking the System Design Interview" and I can say this was an excellent use of money and time. I've grown as a developer and now know the secrets of how to build these really giant internet systems.

Arijeet

Software Engineer

Just completed the “Grokking the system design interview”. It's amazing and super informative. Have come across very few courses that are as good as this!

Simon Barker

Software Engineer

This is what I love about http://designgurus.io’s Grokking the coding interview course. They teach patterns rather than solutions.

Roger Cruz

Software Engineer

The world gets better inch by inch when you help someone else. If you haven't tried Grokking The Coding Interview, check it out, it's a great resource!

Steven Zhang

Software Engineer

Just wanted to say thanks for your Grokking the system design interview resource (https://lnkd.in/g4Wii9r7) - it helped me immensely when I was interviewing from Tableau (very little system design exp) and helped me land 18 FAANG+ jobs!

Ashley Pean

Software Engineer

Check out Grokking the Coding Interview. Instead of trying out random Algos, they break down the patterns you need to solve them. Helps immensely with retention!

About the Author

Arslan Ahmad

Design Gurus Founder

Ex-FAANG Manager

Industry Expertise & Leadership

Arslan Ahmad is the lead author of Grokking Java Intermediate. As the founder of Design Gurus and a former FAANG hiring manager, he has worked at industry giants like Facebook (now Meta) and Microsoft.

He has conducted hundreds of system design interviews, giving him unique insight into what top tech companies look for in candidates.

The course also incorporates expertise from senior engineers at Google, Meta, Amazon, Microsoft, and Uber, ensuring you learn system design best practices from professionals who have built and scaled real-world systems.

500+

Interviews Conducted

10k+

Students Taught

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FAQs

What is Grokking Java Intermediate?

It is the second Java course on Design Gurus, and it starts where Grokking Java Basics ends. It covers object-oriented programming, Java core classes, generics, the collections framework, regular expressions, file handling, and multithreading.

Who is this course for?

It is for learners who have finished Grokking Java Basics or already know Java syntax, for developers coming to Java from another language who need its object-oriented model and collections, and for students who want a structured path past the basics.

What do I need to know before I start?

You should be comfortable with variables, data types, operators, conditionals, loops, methods, arrays, strings, and exception handling. Grokking Java Basics teaches all of these, and we recommend taking it first if any of them are unfamiliar.

How is it different from Grokking Java Basics?

Java Basics teaches the core language: syntax, types, control flow, methods, arrays, and strings. This course teaches how real Java programs are organized and what they are built from, like classes, interfaces, generics, and the collections framework.

Does the course cover the collections framework?

Yes. It covers lists (ArrayList, LinkedList, Vector, and Stack), sets (HashSet and TreeSet), queues (PriorityQueue and ArrayDeque), and maps (HashMap, LinkedHashMap, and TreeMap), along with iterators and the Comparator interface.

What does the course not cover?

It does not teach the Stream API, lambda expressions, enums, records, database access, or frameworks like Spring. It focuses on the object-oriented core and the standard library that those topics build on.

Is this an interview preparation course?

No. It teaches the language. Object-oriented design and the collections framework appear in almost every Java interview solution, though, so the course is a strong foundation before you practice coding problems in Java.

Is there any practice, or is it only reading?

Every lesson includes code examples that you can edit and run in the browser, and every chapter after the introduction ends with a quiz on its topics.

Is the course text-based or video-based?

It is text-based, with runnable code in the lessons. You read an explanation, change the example, run it, and see the result without pausing or rewinding anything.

Do I get a certificate of completion?

Yes. Design Gurus issues a certificate once you have completed the course, and you can share the link directly or add it to your LinkedIn profile.

One-Stop Portal For Tech Interviews.