Java-Core-Concepts

This repository contains well-structured, beginner-friendly examples and explanations of Core Java concepts.

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📘 Module 1: Introduction to Java

• Writing and Running Your First Java Program (Hello World)

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📗 Module 2: Java Fundamentals

• Data Types and Variables
• Keywords and Identifiers
• Operators and Expressions
• Control Statements (if, switch, for, while, do-while)
• Type Casting
• Arrays and String Handling
• Command Line Arguments
• Taking User Input

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📙 Module 3: Object-Oriented Programming in Java

• Classes and Objects
• Constructors and Initialization
• Method Overloading
• this Keyword
• Static Variables and Methods
• Inheritance
• Method Overriding
• super Keyword
• final Keyword
• Abstract Classes and Methods
• Interfaces and Multiple Inheritance
• Access Modifiers (private, public, protected, default)

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📒 Module 4: Packages and Exception Handling

• Built-in Packages (java.lang, java.util)
• Creating and Using User-Defined Packages
• Java Exception Hierarchy
• try, catch, throw, throws, finally
• Creating Custom Exceptions

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📘 Module 5: Java Memory Management

• Stack and Heap Memory
• Garbage Collection
• finalize() Method
• System.gc() Method

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📗 Module 6: Strings and Wrapper Classes

• String, StringBuilder, and StringBuffer
• Common String Methods
• Autoboxing and Unboxing
• Wrapper Class Overview

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📙 Module 7: Collections Framework

• Introduction to Java Collections
• Interfaces: List, Set, and Map
• Classes: ArrayList, LinkedList, HashSet, TreeSet
• Maps: HashMap, TreeMap
• Iterators: Iterator, ListIterator
• Comparable vs Comparator

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📒 Module 8: File I/O and Serialization

• File Handling using java.io
• Byte Streams and Character Streams
• FileReader, FileWriter, BufferedReader, etc.
• Serialization and Deserialization
• transient Keyword

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📘 Module 9: Multithreading

• Thread Lifecycle
• Creating Threads (Thread Class / Runnable Interface)
• Thread Methods: sleep(), join(), yield()
• Synchronization
• Inter-thread Communication
• wait(), notify(), notifyAll()

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📗 Module 10: Java 8 Features (Optional but Recommended)

• Lambda Expressions
• Functional Interfaces
• Stream API
• Method References
• Default and Static Methods in Interfaces

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📙 Module 11: Logging

• Debugging Basics
• Logging with java.util.logging
• Creating and Managing Log Files

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To Compile and Run

• javac FileName.java
• java FileName

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📌 Happy Coding! 🚀

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