Java Access Modifiers Explained | Public, Private, Protected & Default (Encapsulation Guide)

Control who can access your code and protect your data using Java access modifiers. In this tutorial, you’ll learn how to use public, private, protected, and default (package-private) access levels to build secure, maintainable, and well-structured applications. Access modifiers are a core part of encapsulation in object-oriented programming, helping you define clear boundaries and prevent unintended access to your data. -------------------------------------------------- What You’ll Learn - What access modifiers are and why they matter - The four levels: public, protected, default, private - How access control improves security and maintainability - The relationship between access modifiers and encapsulation - Choosing the right access level for your code - Common beginner mistakes and best practices -------------------------------------------------- Practice Code (GitHub Repository) Follow along with the examples: https://github.com/TheStudyRoomJournal/JAVA_PROGRAMMING/blob/main/BEGINNERS/Module_5_OOP/Access%20Modifiers -------------------------------------------------- Helpful Resources & Related Links Official & Concept References Java Access Control (Official Docs) https://docs.oracle.com/javase/tutorial/java/javaOO/accesscontrol.html Encapsulation in Java https://www.baeldung.com/java-encapsulation Access Modifiers Explained https://www.geeksforgeeks.org/access-modifiers-java/ Java Packages (Default Access Context) https://docs.oracle.com/javase/tutorial/java/package/packages.html -------------------------------------------------- Deepen Your Understanding (Highly Relevant) Java Classes & Objects https://docs.oracle.com/javase/tutorial/java/javaOO/classes.html Java Constructors https://docs.oracle.com/javase/tutorial/java/javaOO/constructors.html Java this Keyword https://docs.oracle.com/javase/tutorial/java/javaOO/thiskey.html Getter & Setter Methods (Encapsulation Practice) https://www.baeldung.com/java-getters-setters -------------------------------------------------- Key Insights - public - accessible from anywhere - private - accessible only within the same class - protected - accessible within package and subclasses - default - accessible only within the same package Best practice: Always use the most restrictive access level possible -------------------------------------------------- Practice Challenge - Create a Car class - Make fields private - Add public getters and setters - Try accessing fields directly from another class (observe restriction) -------------------------------------------------- Timestamps 00:00 Introduction 00:11 What are access modifiers 01:10 Why access control matters 01:23 Encapsulation explained 01:58 Four access modifiers overview 03:22 Access hierarchy 03:36 Who can access what 03:57 Code example 04:57 Real-world importance 05:22 Common mistakes 06:00 Golden rule 06:04 Practice challenge 06:24 Key takeaway 06:40 Next topic preview -------------------------------------------------- Support Like the video Comment your class design Subscribe for structured Java tutorials