Java projects with tutorial 🚀

Supermarket Management: https://youtube.com/playlist?list=PL-cxzMmn1xXEvQLajE2zYEfeF11lISJ0c&si=RwNa9HRFsrfFYvIy

Bank Management: https://youtube.com/playlist?list=PL_6klLfS1WqE1-_MJgZiJqAaccjLGHh0H&si=mw6PqEsAhrYskQjg

Cafe Management: https://youtube.com/playlist?list=PLdRq0mbeEBmwdwZF3lWwCcWmD76GfEFVT&si=opkQC14_5p3t0xBp

Chatbot: https://youtu.be/QP4HsdEPd-M?si=flwWw07VrWxr8qVY

Voting application: https://youtube.com/playlist?list=PLhHaibdHQVE1i3qWow-Mp0W_OrBrq1ykg&si=mtKqYDMxvgrMc97x

Food delivery: https://youtube.com/playlist?list=PL4fpXNDGXCyWXY7Sb_bp9VEENEW_UsG75&si=jHcdxrgbhbwvDqwa

University management: https://youtube.com/playlist?list=PL_6klLfS1WqH8iVglMyh7FVniAvD9Ar-E&si=i5jv8e6oj76BKQ7K

✅ Top 50 Java Interview Questions ☕

1. What are the main features of Java?
2. Difference between JDK, JRE, and JVM
3. What is the Java Virtual Machine (JVM)?
4. Explain the concept of Object-Oriented Programming in Java
5. What is the difference between == and .equals()?
6. What are access modifiers in Java?
7. Difference between abstract class and interface
8. What is a constructor? Types of constructors?
9. What is method overloading and overriding?
10. What is the difference between static and non-static methods?
11. What is the final keyword?
12. What is a package in Java?
13. What is the use of this and super keywords?
14. Difference between String, StringBuilder, and StringBuffer
15. What are exceptions? Checked vs unchecked exceptions
16. What is try-catch-finally in Java?
17. What is the difference between throw and throws?
18. Explain multithreading in Java
19. What is synchronization?
20. What is a thread lifecycle?
21. Explain collections in Java
22. Difference between List, Set, and Map
23. What is the difference between ArrayList and LinkedList?
24. What is HashMap?
25. Difference between HashMap and Hashtable
26. What is the hashCode() and equals() contract?
27. Explain generics in Java
28. What is an enum in Java?
29. What is a lambda expression?
30. What is functional interface?
31. What is the Stream API in Java 8?
32. What is Optional in Java 8?
33. What are default and static methods in interfaces?
34. What is garbage collection in Java?
35. What is the finalize() method?
36. What are annotations?
37. What is reflection in Java?
38. What is serialization and deserialization?
39. What is the transient keyword?
40. How does Java handle memory management?
41. What is JDBC in Java?
42. How do you connect to a database in Java?
43. What is the difference between Statement and PreparedStatement?
44. What is a singleton design pattern?
45. What is the factory pattern?
46. What is dependency injection?
47. What is the difference between stack and heap memory?
48. What are inner classes in Java?
49. What are best practices in exception handling?
50. How do you debug a Java application?

💬 Tap ❤️ for the detailed answers!

✅ Top Java Interview Questions with Answers: Part-1 ☕

1️⃣ What are the main features of Java?
– Object-Oriented: Everything is an object
– Platform-Independent: Write Once, Run Anywhere (via JVM)
– Simple Secure: Easy syntax + built-in security features
– Multithreaded: Supports concurrent execution
– Robust: Handles errors using exception handling
– High Performance: Through Just-In-Time (JIT) compiler
– Distributed: Can build networked applications using RMI, EJB

2️⃣ Difference between JDK, JRE, and JVM
– JDK (Java Development Kit): Includes tools to develop Java programs (compiler, debugger, etc.)
– JRE (Java Runtime Environment): Runtime for executing Java apps, includes JVM + libraries
– JVM (Java Virtual Machine): Executes Java bytecode; platform-dependent

3️⃣ What is the Java Virtual Machine (JVM)?
JVM is a virtual engine that runs Java bytecode on your machine. It converts .class files to machine code during runtime and handles memory, security, and garbage collection.

4️⃣ Explain the concept of Object-Oriented Programming in Java
Java uses OOP principles:
• Encapsulation: Data hiding using classes
• Inheritance: One class inherits from another
• Polymorphism: One interface, many implementations
• Abstraction: Hiding complexity via abstract classes or interfaces

5️⃣ What is the difference between == and .equals()?
– ==: Compares object references (memory address)
– .equals(): Compares actual content/data of the objects (overridden in String, etc.)

6️⃣ What are access modifiers in Java?
They control visibility of classes, methods, and variables:
• public: Accessible everywhere
• private: Only within the same class
• protected: Within same package + subclasses
• (default): Only within the same package

7️⃣ Difference between abstract class and interface
Abstract Class:
• Can have method bodies
• Can declare constructors
• Supports single inheritance
• Suitable for shared base logic

Interface:
• Only method signatures (till Java 7)
• Cannot have constructors
• Supports multiple interfaces
• Suitable for contract-based design

8️⃣ What is a constructor? Types of constructors?
Constructor is a special method used to initialize objects.
• Default Constructor: No parameters
• Parameterized Constructor: Accepts arguments
It’s called automatically when an object is created.

9️⃣ What is method overloading and overriding?
– Overloading: Same method name, different parameters (within same class)
– Overriding: Redefining superclass method in subclass with same signature

🔟 What is the difference between static and non-static methods?
– Static Method: Belongs to the class, can be called without creating an object
– Non-static Method: Belongs to an instance; requires object creation to access
Static methods can’t directly access instance variables.

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