Java and Android Tutorials By Surya Sir

Learn SOLID Design Principles - Dependency Inversion Principle (DIP), Object-Oriented Design. In this video, we dive deep into the Dependency Inversion Principle (DIP), one of the five core SOLID principles in software development. Learn how to write clean, maintainable, and scalable code by restructuring dependencies in your applications.

🔍 What you'll learn:
1️⃣ What is the Dependency Inversion Principle?
2️⃣ Common coding issues caused by tightly coupled dependencies.
3️⃣ Step-by-step refactoring using DIP.
4️⃣ How DIP improves maintainability and scalability.
5️⃣ Real-world Java examples to demonstrate DIP in action.

Whether you're a beginner or an experienced developer, this video breaks down complex concepts into simple, actionable steps. Don't miss out on improving your coding skills with SOLID principles!

Part of Low Level System Design - Everything is explained in Hindi (हिन्दी)
What you'll learn:

🔔 Don't forget to Like, Share, and Subscribe!
💬 Got questions? Drop them in the comments below!



Dependency Inversion Principle (DIP) -

High level modules should not depend on low level modules. Both should depends on the abstractions.
Abstraction should not depends on implementation. Implementation should depend on abstraction.

A high-level concrete class should not depend on low-level concrete class. Instead, both should depends on abstraction.

Abstraction should not depend upon details . Instead , the details should depend upon abstraction.

Advantage -

Reduce the coupling
Easy for Unit Testing
Easy to Change implementation
Easy to manage.

Stay tuned with me for more upcoming Videos,
don't forget to subscribe my YouTube Channel and share your valuable comments in Comment section down below, i'll be happy t o help you all, your Surya ☺

Are you ready to take your software develoment and testing skills to the next level? 🧪🔍 Unleash the power of automation and master the art of seamless development and testing with our comprehensive training program!

📞 Ready to Enroll? Call now at [9310683500] and embark on a journey to become a testing pro!

Don't miss out on this chance to enhance your skills and boost your career prospects. Whether you're a beginner looking to start your testing journey or an experienced tester aiming to expand your horizons, our training program has something for everyone.

👉 Hurry, limited seats available! Dial [9310683500] to secure your spot and set yourself on the path to testing & develoment excellence.

Important Videos:
➡️ https://www.youtube.com/watch?v=PsPKoPSkqxk&list=PLnfapp4Woqprr2X5gJTBA5PaFsf9d0g9K&ab_channel=AndroJavaTech4U

➡️ https://youtu.be/dDfgiADWgbE

➡️ https://youtu.be/dDfgiADWgbE

➡️ https://www.youtube.com/watch?v=2EgbC42k5xE&ab_channel=AndroJavaTech4U

Important Playlist:
➡️ https://www.youtube.com/watch?v=eoufkB4fw1E&list=PLnfapp4Woqpp6DMiUgOQc-LeLV2Rosj-L&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=EinNCREI6pU&list=PLnfapp4Woqprg0P3w8LNjWasni0_-oreZ&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=7WW4t2LRNE0&list=PLnfapp4Woqpo0QDKTi692dveQJAW-GzB9&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=TYzWSWAQhDg&list=PLnfapp4Woqprxl6N1r4Gkq87Lkn-IEZ0z&ab_channel=AndroJavaTech4U

➡️ https://www.youtube.com/watch?v=OM6szbk_6Do&list=PLnfapp4WoqppEpg0_pmq2vnuuxorkEqr0&pp=gAQBiAQB

Connect on Socials (FOLLOW ME ON)

Facebook 👉 https://www.facebook.com/AndroJavaTech4u
Twitter 👉 https://twitter.com/AndroJavaTech4U
Google Plus 👉 https://plus.google.com/u/0/+AndroJavaTech4U
LinkedIn: 👉 https://www.linkedin.com/in/androjavatech4u
Telegram 👉 https://telegram.me/AndroJavaTech4u
Whtats App 👉 https://whatsapp.com/channel/0029Va9r6ZO2kNFkGq6OTM2

Learn SOLID Design Principles - Interface Segregation Principle (ISP), Object-Oriented Design. ISP states that no client should be forced to depend on methods it does not use, promoting small, focused interfaces instead of large, unwieldy ones.

We’ll start with a problematic code example that violates ISP, showing you how large interfaces lead to confusion and maintenance issues. Then, we’ll walk through the process of refactoring the code, applying ISP to split the large interface into smaller, more cohesive ones that better align with client needs.

Part of Low Level System Design - Everything is explained in Hindi (हिन्दी)

What you'll learn:

What is the Interface Segregation Principle?
Common issues caused by violating ISP.
How to refactor your code to follow ISP.
Benefits of ISP for maintainability, scalability, and unit testing.
Real-world Java examples demonstrating ISP in action.

🔔 Don't forget to Like, Share, and Subscribe!
💬 Got questions? Drop them in the comments below!



Interface Segregation Principle (ISP)-
Class should not be forced to implement interface that it does not use.
Instead of deigning 1 or 2 FAT interface design multiple interfaces.
It is the extension of single responsibilities.

One interface should not be handling a lot of responsibilities . Instead , multiple interfaces should be handling different responsibilities.

Design an interface in such a way that the classes that implements those interface does not have many unused methods.

Rule -
Always to have small and focused interface .

Stay tuned with me for more upcoming Videos,
don't forget to subscribe my YouTube Channel and share your valuable comments in Comment section down below, i'll be happy t o help you all, your Surya ☺

Are you ready to take your software develoment and testing skills to the next level? 🧪🔍 Unleash the power of automation and master the art of seamless development and testing with our comprehensive training program!

📞 Ready to Enroll? Call now at [9310683500] and embark on a journey to become a testing pro!

Don't miss out on this chance to enhance your skills and boost your career prospects. Whether you're a beginner looking to start your testing journey or an experienced tester aiming to expand your horizons, our training program has something for everyone.

👉 Hurry, limited seats available! Dial [9310683500] to secure your spot and set yourself on the path to testing & develoment excellence.

Important Videos:
➡️ https://www.youtube.com/watch?v=PsPKoPSkqxk&list=PLnfapp4Woqprr2X5gJTBA5PaFsf9d0g9K&ab_channel=AndroJavaTech4U

➡️ https://youtu.be/dDfgiADWgbE

➡️ https://youtu.be/dDfgiADWgbE

➡️ https://www.youtube.com/watch?v=2EgbC42k5xE&ab_channel=AndroJavaTech4U

Important Playlist:
➡️ https://www.youtube.com/watch?v=eoufkB4fw1E&list=PLnfapp4Woqpp6DMiUgOQc-LeLV2Rosj-L&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=EinNCREI6pU&list=PLnfapp4Woqprg0P3w8LNjWasni0_-oreZ&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=7WW4t2LRNE0&list=PLnfapp4Woqpo0QDKTi692dveQJAW-GzB9&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=TYzWSWAQhDg&list=PLnfapp4Woqprxl6N1r4Gkq87Lkn-IEZ0z&ab_channel=AndroJavaTech4U

➡️ https://www.youtube.com/watch?v=OM6szbk_6Do&list=PLnfapp4WoqppEpg0_pmq2vnuuxorkEqr0&pp=gAQBiAQB

Connect on Socials (FOLLOW ME ON)

Facebook 👉 https://www.facebook.com/AndroJavaTech4u
Twitter 👉 https://twitter.com/AndroJavaTech4U
Google Plus 👉 https://plus.google.com/u/0/+AndroJavaTech4U
LinkedIn: 👉 https://www.linkedin.com/in/androjavatech4u
Telegram 👉 https://telegram.me/AndroJavaTech4u
Whtats App 👉 https://whatsapp.com/channel/0029Va9r6ZO2kNFkGq6OTM2

In this video, we break down the Liskov Substitution Principle (LSP) from the SOLID principles using a Java example. 📖 You'll learn:
✅ What the Liskov Substitution Principle is.
✅ A problematic code example violating LSP.
✅ How to refactor the code to follow LSP.
✅ Issues solved by applying LSP.
✅ Benefits for maintainability, scalability, and unit testing.
✅ Real-world application of LSP in Java development.

🎯 Why Watch?
Understanding LSP is crucial for writing clean, flexible, and bug-free code. By the end of this tutorial, you'll be able to apply LSP in your projects confidently!

📌 Chapters:
Introduction
What is LSP?
Problematic Code Example
Refactored Code Using LSP
Benefits of Applying LSP

🔔 Don't forget to Like, Share, and Subscribe!
💬 Got questions? Drop them in the comments below!



Stay tuned with me for more upcoming Videos,
don't forget to subscribe my YouTube Channel and share your valuable comments in Comment section down below, i'll be happy t o help you all, your Surya ☺

Are you ready to take your software develoment and testing skills to the next level? 🧪🔍 Unleash the power of automation and master the art of seamless development and testing with our comprehensive training program!

📞 Ready to Enroll? Call now at [9310683500] and embark on a journey to become a testing pro!

Don't miss out on this chance to enhance your skills and boost your career prospects. Whether you're a beginner looking to start your testing journey or an experienced tester aiming to expand your horizons, our training program has something for everyone.

👉 Hurry, limited seats available! Dial [9310683500] to secure your spot and set yourself on the path to testing & develoment excellence.

Important Videos:
➡️ https://www.youtube.com/watch?v=PsPKoPSkqxk&list=PLnfapp4Woqprr2X5gJTBA5PaFsf9d0g9K&ab_channel=AndroJavaTech4U

➡️ https://youtu.be/dDfgiADWgbE

➡️ https://youtu.be/dDfgiADWgbE

➡️ https://www.youtube.com/watch?v=2EgbC42k5xE&ab_channel=AndroJavaTech4U

Important Playlist:
➡️ https://www.youtube.com/watch?v=eoufkB4fw1E&list=PLnfapp4Woqpp6DMiUgOQc-LeLV2Rosj-L&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=EinNCREI6pU&list=PLnfapp4Woqprg0P3w8LNjWasni0_-oreZ&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=7WW4t2LRNE0&list=PLnfapp4Woqpo0QDKTi692dveQJAW-GzB9&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=TYzWSWAQhDg&list=PLnfapp4Woqprxl6N1r4Gkq87Lkn-IEZ0z&ab_channel=AndroJavaTech4U

➡️ https://www.youtube.com/watch?v=OM6szbk_6Do&list=PLnfapp4WoqppEpg0_pmq2vnuuxorkEqr0&pp=gAQBiAQB

Connect on Socials (FOLLOW ME ON)

Facebook 👉 https://www.facebook.com/AndroJavaTech4u
Twitter 👉 https://twitter.com/AndroJavaTech4U
Google Plus 👉 https://plus.google.com/u/0/+AndroJavaTech4U
LinkedIn: 👉 https://www.linkedin.com/in/androjavatech4u
Telegram 👉 https://telegram.me/AndroJavaTech4u
Whtats App 👉 https://whatsapp.com/channel/0029Va9r6ZO2kNFkGq6OTM2

In the second part, we will dive into the Open/Closed Principle (OCP), which advocates that software entities should be open for extension but closed for modification. We will explore the benefits of adhering to OCP, techniques for designing extensible and flexible code.
2. Open-Closed Principle (OCP) - A software entity/module (class) should be open for extension but closed for modification.
Rule - Add new feature without breaking existing functionality.

If you found this content useful and valuable, please show your support by clicking the LIKE button. Your feedback is essential to me and motivates me to continue producing high-quality content for aspiring engineers and professionals like you.

If you have any questions or concerns, feel free to share them in the comments section below. Your input is valuable to me, and I will do my best to address your concerns.

Stay tuned with me for more upcoming Videos,
don't forget to subscribe my YouTube Channel and share your valuable comments in Comment section down below, i'll be happy t o help you all, your Surya ☺

Are you ready to take your software develoment and testing skills to the next level? 🧪🔍 Unleash the power of automation and master the art of seamless development and testing with our comprehensive training program!

📞 Ready to Enroll? Call now at [9310683500] and embark on a journey to become a testing pro!

Don't miss out on this chance to enhance your skills and boost your career prospects. Whether you're a beginner looking to start your testing journey or an experienced tester aiming to expand your horizons, our training program has something for everyone.

👉 Hurry, limited seats available! Dial [9310683500] to secure your spot and set yourself on the path to testing & develoment excellence.

Important Videos:
➡️ https://www.youtube.com/watch?v=PsPKoPSkqxk&list=PLnfapp4Woqprr2X5gJTBA5PaFsf9d0g9K&ab_channel=AndroJavaTech4U

➡️ https://youtu.be/dDfgiADWgbE

➡️ https://youtu.be/dDfgiADWgbE

➡️ https://www.youtube.com/watch?v=2EgbC42k5xE&ab_channel=AndroJavaTech4U

Important Playlist:
➡️ https://www.youtube.com/watch?v=eoufkB4fw1E&list=PLnfapp4Woqpp6DMiUgOQc-LeLV2Rosj-L&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=EinNCREI6pU&list=PLnfapp4Woqprg0P3w8LNjWasni0_-oreZ&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=7WW4t2LRNE0&list=PLnfapp4Woqpo0QDKTi692dveQJAW-GzB9&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=TYzWSWAQhDg&list=PLnfapp4Woqprxl6N1r4Gkq87Lkn-IEZ0z&ab_channel=AndroJavaTech4U

➡️ https://www.youtube.com/watch?v=OM6szbk_6Do&list=PLnfapp4WoqppEpg0_pmq2vnuuxorkEqr0&pp=gAQBiAQB

Connect on Socials (FOLLOW ME ON)

Facebook 👉 https://www.facebook.com/AndroJavaTech4u
Twitter 👉 https://twitter.com/AndroJavaTech4U
Google Plus 👉 https://plus.google.com/u/0/+AndroJavaTech4U
LinkedIn: 👉 https://www.linkedin.com/in/androjavatech4u
Telegram 👉 https://telegram.me/AndroJavaTech4u
Whtats App 👉 https://whatsapp.com/channel/0029Va9r6ZO2kNFkGq6OTM2

The SOLID Principles are five principles of Object-Oriented class design. They are a set of rules and best practices to follow while designing a class structure.

Topics covered:
What are SOLID Principles?
Why we need SOLID Principles? (Advantages of SOLID principles)
SOLID Principles explanations with code examples
The Single Responsibility Principle
The Open-Closed Principle
The Liskov Substitution Principle
The Interface Segregation Principle
The Dependency Inversion Principle

SOLID Principles -

It is the set of five deign principles for object oriented programming developed by Robert C. Martin, also known as "Uncle Bob" in his 2000 paper “Design Principles and Design Patterns.”

SOLID Acronym

SOLID is an acronym that stands for five key design principles:

1. Single Responsibility Principle (SRP)
2. Open-Closed Principle (OCP)
3. Liskov Substitution Principle (LSP)
4. Interface Segregation Principle (ISP)
5. Dependency Inversion Principle (DIP)

Advantages of SOLID Principles :-

Achieve the reduction in complexity of the code
Increase readability, extensibility, and maintenance
Increase scalability, code flexibility, and readability
Achieve Better testability
Reduce tight coupling
Reduce error and implement Reusability
Increase Parallel development

1. Single Responsibility Principle (SRP) A class should have one, and only one, reason to change.
A class should only have one responsibility .

Stay tuned with me for more upcoming Videos,
don't forget to subscribe my YouTube Channel and share your valuable comments in Comment section down below, i'll be happy t o help you all, your Surya ☺

Are you ready to take your software develoment and testing skills to the next level? 🧪🔍 Unleash the power of automation and master the art of seamless development and testing with our comprehensive training program!

📞 Ready to Enroll? Call now at [9310683500] and embark on a journey to become a testing pro!

Don't miss out on this chance to enhance your skills and boost your career prospects. Whether you're a beginner looking to start your testing journey or an experienced tester aiming to expand your horizons, our training program has something for everyone.

👉 Hurry, limited seats available! Dial [9310683500] to secure your spot and set yourself on the path to testing & develoment excellence.

Important Videos:
➡️ https://www.youtube.com/watch?v=PsPKoPSkqxk&list=PLnfapp4Woqprr2X5gJTBA5PaFsf9d0g9K&ab_channel=AndroJavaTech4U

➡️ https://youtu.be/dDfgiADWgbE

➡️ https://youtu.be/dDfgiADWgbE

➡️ https://www.youtube.com/watch?v=2EgbC42k5xE&ab_channel=AndroJavaTech4U

Important Playlist:
➡️ https://www.youtube.com/watch?v=eoufkB4fw1E&list=PLnfapp4Woqpp6DMiUgOQc-LeLV2Rosj-L&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=EinNCREI6pU&list=PLnfapp4Woqprg0P3w8LNjWasni0_-oreZ&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=7WW4t2LRNE0&list=PLnfapp4Woqpo0QDKTi692dveQJAW-GzB9&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=TYzWSWAQhDg&list=PLnfapp4Woqprxl6N1r4Gkq87Lkn-IEZ0z&ab_channel=AndroJavaTech4U

➡️ https://www.youtube.com/watch?v=OM6szbk_6Do&list=PLnfapp4WoqppEpg0_pmq2vnuuxorkEqr0&pp=gAQBiAQB

Connect on Socials (FOLLOW ME ON)

Facebook 👉 https://www.facebook.com/AndroJavaTech4u
Twitter 👉 https://twitter.com/AndroJavaTech4U
Google Plus 👉 https://plus.google.com/u/0/+AndroJavaTech4U
LinkedIn: 👉 https://www.linkedin.com/in/androjavatech4u
Telegram 👉 https://telegram.me/AndroJavaTech4u
Whtats App 👉 https://whatsapp.com/channel/0029Va9r6ZO2kNFkGq6OTM2

Hello Friends in this live session i discussed about Difference Between ClassNotFoundException & NoClassDefFoundError
ClassNotFoundException:
This Occurs when JVM tries to load a class which is not present in class path .
Can be caught and handled programmatically.

Scenarios :
* Incorrect package name specified.
* Misspelled class name in code.
* Missing dependency JAR files.
* Dynamically loading class using reflection . (Class.forName)

NoClassDefFoundError :
This occurs when class was present in compile time but not present at Runtime.
Difficult to handle programmatically.

Scenarios :
* Class path misconfiguration
* JAR file not included in the classpath
* External dependencies missing at runtime
* Class file deleted or moved after compilation.

| Feature | ClassNotFoundException | NoClassDefFoundError |
| --------------- | ------------------------------------------- | ------------------------------------------------------------- |
| Type | Checked Exception | Unchecked Error |
| When it occurs | When loading class dynamically | When class was present at compile time but missing at runtime |
| Common cause | Wrong class name or class not in classpath | Class removed or not present in runtime classpath |
| How to fix | Check `Class.forName()` input and classpath | Ensure class is in runtime classpath |
| Example trigger | `Class.forName("com.example.X")` | `new SomeClass()` (if missing at runtime) |

👨‍💻 Java Interview Questions for Freshers (Basic Level Java Interview Questions And Answers):

💡 FAQs:
1. What are the common Java Interview Questions for Freshers?
Expect basic questions on Java fundamentals, Core Java, Java Collections, object-oriented programming, data types, and exception handling.

2. How do I prepare for Java Coding Interview Questions?
Practice Java coding questions, focusing on algorithms, data structures, and problem-solving, while reviewing Core Java questions as they form the foundation.

3. What should I focus on for Java Interview Questions for Experienced candidates?
For experienced roles, focus on advanced topics like Java 8, multithreading, design patterns, and performance optimization.

Stay tuned with me for more upcoming Videos,
don't forget to subscribe my YouTube Channel and share your valuable comments in Comment section down below, i'll be happy t o help you all, your Surya ☺

Are you ready to take your software develoment and testing skills to the next level? 🧪🔍 Unleash the power of automation and master the art of seamless development and testing with our comprehensive training program!

📞 Ready to Enroll? Call now at [9310683500] and embark on a journey to become a testing pro!

Don't miss out on this chance to enhance your skills and boost your career prospects. Whether you're a beginner looking to start your testing journey or an experienced tester aiming to expand your horizons, our training program has something for everyone.

👉 Hurry, limited seats available! Dial [9310683500] to secure your spot and set yourself on the path to testing & develoment excellence.

Important Videos:
➡️ https://www.youtube.com/watch?v=PsPKoPSkqxk&list=PLnfapp4Woqprr2X5gJTBA5PaFsf9d0g9K&ab_channel=AndroJavaTech4U

➡️ https://youtu.be/dDfgiADWgbE

➡️ https://youtu.be/dDfgiADWgbE

➡️ https://www.youtube.com/watch?v=2EgbC42k5xE&ab_channel=AndroJavaTech4U

Important Playlist:
➡️ https://www.youtube.com/watch?v=eoufkB4fw1E&list=PLnfapp4Woqpp6DMiUgOQc-LeLV2Rosj-L&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=EinNCREI6pU&list=PLnfapp4Woqprg0P3w8LNjWasni0_-oreZ&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=7WW4t2LRNE0&list=PLnfapp4Woqpo0QDKTi692dveQJAW-GzB9&pp=gAQBiAQB

➡️ https://www.youtube.com/watch?v=TYzWSWAQhDg&list=PLnfapp4Woqprxl6N1r4Gkq87Lkn-IEZ0z&ab_channel=AndroJavaTech4U

➡️ https://www.youtube.com/watch?v=OM6szbk_6Do&list=PLnfapp4WoqppEpg0_pmq2vnuuxorkEqr0&pp=gAQBiAQB

Connect on Socials (FOLLOW ME ON)

Facebook 👉 https://www.facebook.com/AndroJavaTech4u
Twitter 👉 https://twitter.com/AndroJavaTech4U
Google Plus 👉 https://plus.google.com/u/0/+AndroJavaTech4U
LinkedIn: 👉 https://www.linkedin.com/in/androjavatech4u
Telegram 👉 https://telegram.me/AndroJavaTech4u
Whtats App 👉 https://whatsapp.com/channel/0029Va9r6ZO2kNFkGq6OTM2