Java Hand Written Notes (28 Pages)

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Java Hand Written Notes (28 Pages)

Hey, devs! 👋, I hope everyone’s doing fantastic. Today, I want to share with you the Java Hand Written Notes.

Core Java Interview Questions: Key Notes for Preparation!

As many of us gear up for job interviews, mastering Core Java concepts is essential. Here’s a quick reference guide to help you ace those interviews:

Core Java Interview Notes:

1. JDK, JRE, JVM:
JDK (Java Development Kit): Tools for developing Java applications.
JRE (Java Runtime Environment): Provides libraries and JVM for running Java apps.
JVM (Java Virtual Machine): Executes Java bytecode.

2. OOP Principles:
Encapsulation: Bundling data and methods.
Inheritance: Extending classes to reuse code.
Polymorphism: Method overloading and overriding.
Abstraction: Hiding complex implementation details.

3. Access Modifiers:
Public, Private, Protected, Default: Control visibility at different levels.

4. Exception Handling:
try-catch-finally: Handling errors gracefully.
Checked vs. Unchecked: Understand the difference.

5. Collections Framework:
Key interfaces: List, Set, Map.
Implementations: ArrayList, HashSet, HashMap.

6. Comparison:
== vs. .equals(): Understand reference vs. value comparison.

7. Multithreading:
Threads: Basics of creating and managing threads.
Synchronization: Ensuring thread safety.

8. Java 8 Features:
Lambdas: Functional programming.
Streams: Process collections with ease.
Date/Time API: Improved date handling.

9. Garbage Collection:
Automatic memory management; understand how it works.

10. Design Patterns:
Singleton: Ensures a class has only one instance.