How to protect registration webpage from spam Using CAPTCHA & mathematical question
Using CAPTCHA to Block Spam and Bots On Your Website add a simple mathematical question (ex: 5+2) to stop the spam
https://youtu.be/HsOTbn2xpRM

Asp.net MVC Tutorial:
https://www.youtube.com/playlist?list=PLMoluEXvWXK5OxieFW5ogrkdeMp9GgaYv

Asp.net C# webform Tutorial:
https://www.youtube.com/playlist?list=PLMoluEXvWXK6Q1h-5vVX4tzX7-O2FdgZA

Complete Library Project:
https://www.youtube.com/playlist?list=PLMoluEXvWXK7iAOcTw4AndY-ZwIOKlKZP

Shopping Website:
https://www.youtube.com/playlist?list=PLMoluEXvWXK4cAOkQmnNguk4O5vx84oQ4

SQL Server:
https://www.youtube.com/playlist?list=PLMoluEXvWXK4B35oqCvC8iLq-E-7EV9Mg

Python:
https://www.youtube.com/playlist?list=PLMoluEXvWXK4Ji15P81Dcixl14QytPSWq

Hello Connections,

This post is tailored for Java Developers with 2 to 4 years of experience who are preparing for interviews. Below are key questions that are frequently asked:


1. How does HashMap work internally?
2. Can you explain the internal workings of HashSet?
3. What are the key differences between List and Set?
4. Differentiate between Fail-Fast and Fail-Safe iterators.
5. Explain the distinctions between HashMap and ConcurrentHashMap.
6. How do you handle ConcurrentModificationException?
7. Enumerate the different levels of JVM memory.
8. What role does a Class Loader play in Java?
9. Define and differentiate Abstraction and Interface.
10. Do abstract classes have constructors?
11. Explain the SOLID principles in object-oriented design.
12. What are the fundamental concepts of Object-Oriented Programming (OOP)?
13. List some features introduced in Java 8.
14. Define Stream API in Java and discuss its types.
15. Explain the Singleton Design Pattern.
16. What are Builder, Prototype, and Factory design patterns?
17. Describe the contract between HashCode and Equals methods.
18. What is Synchronization in multithreading?
19. Explain Serialization in Java.
20. What is object cloning, and what are its types?
21. Differentiate between shallow cloning and deep cloning.
22. How can you make a class immutable in Java?
23. Explain how the string constant pool works in Java.

Mastery of these topics will significantly enhance your readiness for Java developer interviews.

Getting Started with Git

🎯𝗴𝗶𝘁 𝗶𝗻𝗶𝘁: This is the very first command you'll need to use when starting a new project. It initializes a new Git repository in your current directory.

🎯𝗴𝗶𝘁 𝗰𝗹𝗼𝗻𝗲 <𝗿𝗲𝗽𝗼> : To work on an existing project you'll want to clone (copy) it to your local machine. This command does that.

𝗠𝗮𝗸𝗲 𝗖𝗵𝗮𝗻𝗴𝗲𝘀

🎯𝗴𝗶𝘁 𝘀𝘁𝗮𝘁𝘂𝘀: Before making or after making changes it's good practice to check the status of your files. This command will show you any changes that are currently unstaged.

🎯𝗴𝗶𝘁 𝗮𝗱𝗱 <𝗳𝗶𝗹𝗲𝗻𝗮𝗺𝗲> : After you've made some changes to your files you'll want to stage them for a commit. This command adds a specific file to the stage.

🎯𝗴𝗶𝘁 𝗮𝗱𝗱 . 𝗼𝗿 𝗴𝗶𝘁 𝗮𝗱𝗱 -𝗔: Instead of adding files one by one, you can add all your changed files to the stage with one command.

🎯𝗴𝗶𝘁 𝗰𝗼𝗺𝗺𝗶𝘁 -𝗺 "𝗖𝗼𝗺𝗺𝗶𝘁 𝗺𝗲𝘀𝘀𝗮𝗴𝗲": Now that your changes are staged, you can commit them with a descriptive message.

𝗕𝗿𝗮𝗻𝗰𝗵𝗶𝗻𝗴

git branch branch_name: This command is used to create new branch.

🎯𝗴𝗶𝘁 𝗯𝗿𝗮𝗻𝗰𝗵: This command will list all the local branches in your current repository.

🎯𝗴𝗶𝘁 𝗯𝗿𝗮𝗻𝗰𝗵 <𝗯𝗿𝗮𝗻𝗰𝗵𝗻𝗮𝗺𝗲> : This command creates a new branch.

🎯𝗴𝗶𝘁 𝗰𝗵𝗲𝗰𝗸𝗼𝘂𝘁 <𝗯𝗿𝗮𝗻𝗰𝗵𝗻𝗮𝗺𝗲> : If you want to switch to a different branch use this command.

🎯𝗴𝗶𝘁 𝗺𝗲𝗿𝗴𝗲 <𝗯𝗿𝗮𝗻𝗰𝗵𝗻𝗮𝗺𝗲> : Once you've finished making changes in a branch, you'll want to bring those changes into your main branch (usually master). This command does that.

𝗥𝗲𝗺𝗼𝘁𝗲 𝗥𝗲𝗽𝗼𝘀𝗶𝘁𝗼𝗿𝗶𝗲𝘀

🎯𝗴𝗶𝘁 𝗽𝘂𝘀𝗵 𝗼𝗿𝗶𝗴𝗶𝗻 <𝗯𝗿𝗮𝗻𝗰𝗵𝗻𝗮𝗺𝗲> : This command sends your commits to the remote repository.

🎯𝗴𝗶𝘁 𝗽𝘂𝗹𝗹: If other people are also working on your project you'll want to keep your local repo up-to-date with their changes. This command fetches and merges any changes from the remote repository.

🎯𝗴𝗶𝘁 𝗿𝗲𝗺𝗼𝘁𝗲 -𝘃 : To check which remote servers are connected with your local repository.

𝗞𝗲𝘆 𝗗𝗶𝗳𝗳𝗲𝗿𝗲𝗻𝗰𝗲𝘀

🎯𝗴𝗶𝘁 𝗳𝗲𝘁𝗰𝗵 𝘃𝘀 𝗴𝗶𝘁 𝗽𝘂𝗹𝗹: Both download data from a remote repository. However, git fetch just downloads it without integrating it while git pull also merges it into your local files.

🎯𝗴𝗶𝘁 𝗺𝗲𝗿𝗴𝗲 𝘃𝘀 𝗴𝗶𝘁 𝗿𝗲𝗯𝗮𝘀𝗲: Both incorporate changes from one branch to another. git merge combines the source and target branches via a new commit, whereas git rebase moves or combines commits to a new base, making a cleaner history.

🎯𝗴𝗶𝘁 𝗿𝗲𝘀𝗲𝘁 𝘃𝘀 𝗴𝗶𝘁 𝗿𝗲𝘃𝗲𝗿𝘁: Both are used to undo changes. git reset discards local changes completely, while git revert undoes public changes by creating a new reversing commit thereby preserving history.

Git is an extremely powerful tool with plenty more commands and options.
However, this guide gives you a good start & reference point as you continue to explore and leverage Git for your version control needs.

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