Java Programming
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Everything you need to learn Java Programming

Daily Java tutorials, coding challenges, OOP concepts, DSA in Java & more!
Perfect for beginners, CS students & job seekers.

Downloadable PDFs, cheat sheets, interview prep & projects

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Java vs Python ๐Ÿ‘†
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Best Resources to learn Coding ๐Ÿ‘†
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Java Roadmap
|
|-- Fundamentals
| |-- Basics of Programming
| | |-- Introduction to Java
| | |-- Java Development Kit (JDK) and Java Runtime Environment (JRE)
| | |-- Setting Up Development Environment (IDE: IntelliJ IDEA, Eclipse, etc.)
| |
| |-- Syntax and Structure
| | |-- Basic Syntax
| | |-- Variables and Data Types
| | |-- Operators and Expressions
|
|-- Control Structures
| |-- Conditional Statements
| | |-- If-Else Statements
| | |-- Switch Case
| |
| |-- Loops
| | |-- For Loop
| | |-- While Loop
| | |-- Do-While Loop
| |
| |-- Exception Handling
| | |-- Try-Catch Block
| | |-- Finally Block
| | |-- Throw and Throws Keywords
|
|-- Object-Oriented Programming (OOP)
| |-- Basics of OOP
| | |-- Classes and Objects
| | |-- Methods and Constructors
| |
| |-- Inheritance
| | |-- Single and Multiple Inheritance
| | |-- Method Overriding
| | |-- Super Keyword
| |
| |-- Polymorphism
| | |-- Method Overloading
| | |-- Runtime Polymorphism
| | |-- Dynamic Method Dispatch
| |
| |-- Encapsulation
| | |-- Access Modifiers (Public, Private, Protected)
| | |-- Getters and Setters
| | |-- Data Hiding
| |
| |-- Abstraction
| | |-- Abstract Classes
| | |-- Interfaces
|
|-- Advanced Java
| |-- Collections Framework
| | |-- List (ArrayList, LinkedList)
| | |-- Set (HashSet, TreeSet)
| | |-- Map (HashMap, TreeMap)
| | |-- Queue (PriorityQueue, LinkedList)
| |
| |-- Concurrency
| | |-- Multithreading (Creating Threads, Thread Lifecycle)
| | |-- Synchronization
| | |-- Concurrency Utilities (Executors Framework, Callable and Future, Locks and Semaphores)
|
|-- Java Standard Libraries
| |-- I/O Streams
| | |-- File Handling (File Class, Reading and Writing Files)
| | |-- Streams (Byte Streams, Character Streams, Buffered Streams)
| |
| |-- Networking
| | |-- Sockets (TCP and UDP, Socket and ServerSocket Classes)
| | |-- URL and HTTP (URL Class, HttpURLConnection)
| |
| |-- JDBC
| | |-- Database Connectivity (JDBC Drivers, Connection, Statement, and ResultSet)
| | |-- PreparedStatement and CallableStatement
|
|-- Java Frameworks
| |-- Spring Framework
| | |-- Spring Core (Dependency Injection, Inversion of Control)
| | |-- Spring MVC (Model-View-Controller Architecture)
| | |-- Spring Boot (Creating Spring Boot Applications, Starters and Auto-Configuration, Actuator)
| |
| |-- Hibernate
| | |-- ORM Basics (Introduction to ORM, Configuration and Mapping)
| | |-- Advanced Hibernate (Caching, Transactions and Concurrency, Criteria API)
|
|-- Web Development with Java
| |-- Java EE (Jakarta EE)
| | |-- Servlets (Lifecycle, Handling HTTP Requests and Responses, Session Management)
| | |-- JavaServer Pages (JSP) (Syntax, Directives, JSTL and Custom Tags, Expression Language)
| |
| |-- RESTful Web Services
| | |-- JAX-RS (Creating RESTful Services, Annotations and HTTP Methods, Consuming RESTful Services)
|
|-- Build Tools and Dependency Management
| |-- Maven
| | |-- Project Object Model (POM), Dependencies, Repositories, Build Lifecycle and Plugins
| |
| |-- Gradle
| | |-- Build Scripts, Dependency Management, Task Automation
|
|-- Testing in Java
| |-- Unit Testing
| | |-- JUnit (Annotations, Assertions, Test Suites and Runners)
| |
| |-- Mockito (Creating Mocks and Spies and Verification)
| |
| |-- Integration Testing
| | |-- Spring Test (Testing Spring Components and WebTestClient)
|
|-- Deployment and DevOps
| |-- Containers and Microservices
| | |-- Docker (Dockerfile, Image Creation, Container Management)
| | |-- Kubernetes (Pods, Services, Deployments, Managing Java Applications on Kubernetes)

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ENJOY LEARNING๐Ÿ‘๐Ÿ‘
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"Java Project Workshop โ˜•๏ธ"

Master Java programming through hands-on projects! From basic calculators to advanced applications like ATM systems and face detection, build real-world solutions while strengthening your Java skills. Perfect for beginners and intermediate developers looking to expand their portfolio.
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โŒจ๏ธ Useful CSS grid cheat sheet

Youโ€™ve seen this many times. But practice makes perfect, right?
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Real word Java coding standards and best practices.pdf
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Real word Java coding standards and best practices ๐Ÿš€

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Day 30/100
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Java, Spring Boot, Microservices, and Angular.pdf
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Java, Spring Boot, Microservices, and Angular Interview Preparation Guide ๐Ÿ”ฅ

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List of topics you need to cover if you're preparing for Java Interviews based on current Job market:

1. Core Java Fundamentals (Refer to already posted topics)
2. Advanced Java
- Design Patterns
- Multithreading
- Java Memory Model
- Performance Optimization
- Reflection & Dynamic Proxies
3. Spring Framework
- Spring core concepts
- Spring boot
- Spring Data JPA
- Spring Security
- Spring cloud
- Spring webflux
4. Hibernate
5. Testing (JUnit, Mockito, Integration, Functional, Performance Testing)
6. Build Tools (Maven / Gradle)
7. Logging
8. RDBMS, NoSQL DBs
9. WebSecurity Concepts
10. REST API concepts
11. CI/CD (Jenkins, GitHub Actions)
12. Containerization (Docker, Kubernetes)
13. Version Control (GitHub)
14. Monitoring (Grafana, ELK Stack etc)
15. Cloud (AWS, Azure, GCP (Very rare) )
16. Spring boot microservices
16. Messaging systems
17. Caching Strategies
18. System Design
19. Data Structures
20. Algorithms
21. Agile Methodologies
22. Behavioral questions
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Java vs Javascript โœ…
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โœ… Don't Confuse Yourself While Learning Java!

*๐—•๐—ฎ๐˜€๐—ถ๐—ฐ๐˜€ ๐—ผ๐—ณ ๐—๐—ฎ๐˜ƒ๐—ฎ:*
โ€ข Java Syntax & Structure
โ€ข Data Types & Variables
โ€ข Operators
โ€ข Control Flow:
- if-else, switch
- for, while, do-while loops
- break & continue
- try-catch-finally
โ€ข Methods
โ€ข Packages & Imports

*๐—ข๐—ฏ๐—ท๐—ฒ๐—ฐ๐˜-๐—ข๐—ฟ๐—ถ๐—ฒ๐—ป๐˜๐—ฒ๐—ฑ ๐—ฃ๐—ฟ๐—ผ๐—ด๐—ฟ๐—ฎ๐—บ๐—บ๐—ถ๐—ป๐—ด ๐—ถ๐—ป ๐—๐—ฎ๐˜ƒ๐—ฎ:*
โ€ข Classes & Objects
โ€ข Inheritance
โ€ข Polymorphism
โ€ข Encapsulation
โ€ข Abstraction
โ€ข Constructors & Overloading

*๐—๐—ฎ๐˜ƒ๐—ฎ ๐—–๐—ผ๐—น๐—น๐—ฒ๐—ฐ๐˜๐—ถ๐—ผ๐—ป๐˜€ ๐—™๐—ฟ๐—ฎ๐—บ๐—ฒ๐˜„๐—ผ๐—ฟ๐—ธ:*
โ€ข List, Set, Map, Queue
โ€ข ArrayList, HashSet, HashMap, LinkedList
โ€ข Iterators & Loops
โ€ข Sorting & Filtering

*๐—˜๐˜…๐—ฐ๐—ฒ๐—ฝ๐˜๐—ถ๐—ผ๐—ป ๐—›๐—ฎ๐—ป๐—ฑ๐—น๐—ถ๐—ป๐—ด:*
โ€ข try-catch
โ€ข throw, throws
โ€ข Custom Exceptions
โ€ข Exception Hierarchy

*๐—™๐—ถ๐—น๐—ฒ ๐—›๐—ฎ๐—ป๐—ฑ๐—น๐—ถ๐—ป๐—ด ๐—ถ๐—ป ๐—๐—ฎ๐˜ƒ๐—ฎ:*
โ€ข Reading/Writing Files
โ€ข FileReader & BufferedReader
โ€ข FileWriter & BufferedWriter
โ€ข Working with JSON & CSV

*๐—๐—ฎ๐˜ƒ๐—ฎ ๐—Ÿ๐—ถ๐—ฏ๐—ฟ๐—ฎ๐—ฟ๐—ถ๐—ฒ๐˜€ & ๐—ง๐—ผ๐—ผ๐—น๐˜€:*
โ€ข Apache Commons
โ€ข Jackson / Gson for JSON
โ€ข JUnit for Testing
โ€ข Maven / Gradle

*๐——๐—ฎ๐˜๐—ฎ ๐—ฆ๐˜๐—ฟ๐˜‚๐—ฐ๐˜๐˜‚๐—ฟ๐—ฒ๐˜€ ๐—ถ๐—ป ๐—๐—ฎ๐˜ƒ๐—ฎ:*
โ€ข Arrays
โ€ข Strings
โ€ข Lists
โ€ข Stacks & Queues
โ€ข HashMaps
โ€ข Trees & Graphs (Basic)

*๐— ๐˜‚๐—น๐˜๐—ถ๐˜๐—ต๐—ฟ๐—ฒ๐—ฎ๐—ฑ๐—ถ๐—ป๐—ด ๐—ฎ๐—ป๐—ฑ ๐—–๐—ผ๐—ป๐—ฐ๐˜‚๐—ฟ๐—ฟ๐—ฒ๐—ป๐—ฐ๐˜†:*
โ€ข Threads & Runnable
โ€ข Synchronization
โ€ข ExecutorService
โ€ข Concurrency Utilities

*๐—”๐—ฑ๐˜ƒ๐—ฎ๐—ป๐—ฐ๐—ฒ๐—ฑ ๐—ง๐—ผ๐—ฝ๐—ถ๐—ฐ๐˜€:*
โ€ข Lambda Expressions
โ€ข Streams API
โ€ข Functional Interfaces
โ€ข Java 8+ Features
โ€ข Generics
โ€ข Reflection API

๐Ÿ’ฌ Tap โค๏ธ for more!
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Java_OOP-Cheat_Sheet.pdf
255 KB
Java OOP Concepts Cheat Sheet โ˜•๐Ÿ“˜

Master Javaโ€™s Object-Oriented pillars:

๐Ÿ”น Class & Object
๐Ÿ”น Inheritance
๐Ÿ”น Polymorphism
๐Ÿ”น Abstraction
๐Ÿ”น Encapsulation

React โค๏ธ if you love clean Java code!
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Var Vs let Vs const
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Java Developer Interview โค
It'll gonna be super helpful for YOU

๐—ง๐—ผ๐—ฝ๐—ถ๐—ฐ ๐Ÿญ: ๐—ฃ๐—ฟ๐—ผ๐—ท๐—ฒ๐—ฐ๐˜ ๐—ณ๐—น๐—ผ๐˜„ ๐—ฎ๐—ป๐—ฑ ๐—ฎ๐—ฟ๐—ฐ๐—ต๐—ถ๐˜๐—ฒ๐—ฐ๐˜๐˜‚๐—ฟ๐—ฒ
- Please tell me about your project and its architecture, Challenges faced?
- What was your role in the project? Tech Stack of project? why this stack?
- Problem you solved during the project? How collaboration within the team?
- What lessons did you learn from working on this project?
- If you could go back, what would you do differently in this project?

๐—ง๐—ผ๐—ฝ๐—ถ๐—ฐ ๐Ÿฎ: ๐—–๐—ผ๐—ฟ๐—ฒ ๐—๐—ฎ๐˜ƒ๐—ฎ
- String Concepts/Hashcode- Equal Methods
- Immutability
- OOPS concepts
- Serialization
- Collection Framework
- Exception Handling
- Multithreading
- Java Memory Model
- Garbage collection

๐—ง๐—ผ๐—ฝ๐—ถ๐—ฐ ๐Ÿฏ: ๐—๐—ฎ๐˜ƒ๐—ฎ-๐Ÿด/๐—๐—ฎ๐˜ƒ๐—ฎ-๐Ÿญ๐Ÿญ/๐—๐—ฎ๐˜ƒ๐—ฎ๐Ÿญ๐Ÿณ
- Java 8 features
- Default/Static methods
- Lambda expression
- Functional interfaces
- Optional API
- Stream API
- Pattern matching
- Text block
- Modules

๐—ง๐—ผ๐—ฝ๐—ถ๐—ฐ ๐Ÿฐ: ๐—ฆ๐—ฝ๐—ฟ๐—ถ๐—ป๐—ด ๐—™๐—ฟ๐—ฎ๐—บ๐—ฒ๐˜„๐—ผ๐—ฟ๐—ธ, ๐—ฆ๐—ฝ๐—ฟ๐—ถ๐—ป๐—ด-๐—•๐—ผ๐—ผ๐˜, ๐— ๐—ถ๐—ฐ๐—ฟ๐—ผ๐˜€๐—ฒ๐—ฟ๐˜ƒ๐—ถ๐—ฐ๐—ฒ, ๐—ฎ๐—ป๐—ฑ ๐—ฅ๐—ฒ๐˜€๐˜ ๐—”๐—ฃ๐—œ
- Dependency Injection/IOC, Spring MVC
- Configuration, Annotations, CRUD
- Bean, Scopes, Profiles, Bean lifecycle
- App context/Bean context
- AOP, Exception Handler, Control Advice
- Security (JWT, Oauth)
- Actuators
- WebFlux and Mono Framework
- HTTP methods
- JPA
- Microservice concepts
- Spring Cloud

๐—ง๐—ผ๐—ฝ๐—ถ๐—ฐ ๐Ÿฑ: ๐—›๐—ถ๐—ฏ๐—ฒ๐—ฟ๐—ป๐—ฎ๐˜๐—ฒ/๐—ฆ๐—ฝ๐—ฟ๐—ถ๐—ป๐—ด-๐—ฑ๐—ฎ๐˜๐—ฎ ๐—๐—ฝ๐—ฎ/๐——๐—ฎ๐˜๐—ฎ๐—ฏ๐—ฎ๐˜€๐—ฒ (๐—ฆ๐—ค๐—Ÿ ๐—ผ๐—ฟ ๐—ก๐—ผ๐—ฆ๐—ค๐—Ÿ)
- JPA Repositories
- Relationship with Entities
- SQL queries on Employee department
- Queries, Highest Nth salary queries
- Relational and No-Relational DB concepts
- CRUD operations in DB
- Joins, indexing, procs, function

๐—ง๐—ผ๐—ฝ๐—ถ๐—ฐ ๐Ÿฒ: ๐—–๐—ผ๐—ฑ๐—ถ๐—ป๐—ด
- DSA Related Questions
- Sorting and searching using Java API.
- Stream API coding Questions

๐—ง๐—ผ๐—ฝ๐—ถ๐—ฐ ๐Ÿณ: ๐——๐—ฒ๐˜ƒ๐—ผ๐—ฝ๐˜€ ๐—พ๐˜‚๐—ฒ๐˜€๐˜๐—ถ๐—ผ๐—ป๐˜€ ๐—ผ๐—ป ๐—ฑ๐—ฒ๐—ฝ๐—น๐—ผ๐˜†๐—บ๐—ฒ๐—ป๐˜ ๐—ง๐—ผ๐—ผ๐—น๐˜€
- These types of topics are mostly asked by managers or leads who are heavily working on it, That's why they may grill you on DevOps/deployment-related tools, You should have an understanding of common tools like Jenkins, Kubernetes, Kafka, Cloud, and all.

๐—ง๐—ผ๐—ฝ๐—ถ๐—ฐ๐˜€ ๐Ÿด: ๐—•๐—ฒ๐˜€๐˜ ๐—ฝ๐—ฟ๐—ฎ๐—ฐ๐˜๐—ถ๐—ฐ๐—ฒ
- The interviewer always wanted to ask about some design patterns, it may be Normal design patterns like singleton, factory, or observer patterns to know that you can use these in coding.

Make sure to scroll through the above messages ๐Ÿ’ definitely you will get the more interesting things ๐Ÿค 

All the best ๐Ÿ‘๐Ÿ‘
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Core Java.pdf
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Core Java Notes
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๐Ÿด ๐—ฆ๐—ธ๐—ถ๐—น๐—น๐˜€ ๐—ง๐—ผ ๐— ๐—ฎ๐˜€๐˜๐—ฒ๐—ฟ ๐—•๐—ฒ๐—ณ๐—ผ๐—ฟ๐—ฒ ๐—˜๐—ป๐˜๐—ฒ๐—ฟ๐—ถ๐—ป๐—ด ๐—œ๐—ป๐˜๐—ผ ๐Ÿฎ๐Ÿฌ๐Ÿฎ๐Ÿฒ๐Ÿ˜

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โค5
Polymorphism in Java

๐Ÿ“ Polymorphism allows a single interface to be used for different types of actions.
๐Ÿ“ It is of two types:

Method Overloading (Compile-time Polymorphism)

Method Overriding (Runtime Polymorphism)


Method Overloading (Same method name, different parameters)

class MathOperations {
int add(int a, int b) {
return a + b;
}

double add(double a, double b) {
return a + b;
}
}

Method Overriding (Same method in parent and child class)

class Animal {
void makeSound() {
System.out.println("Animal makes a sound");
}
}

class Dog extends Animal {
void makeSound() {
System.out.println("Dog barks");
}
}

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