• Understanding classes and objects
• Learning about constructors
• Understanding access modifiers
• Working with instance variables and methods
• Understanding encapsulation principles

• Class: Blueprint or template for creating objects
• Object: Instance of a class with state and behavior
• State: Data stored in instance variables
• Behavior: Actions performed by methods

• Special methods called when creating objects
• Same name as class, no return type
• Initialize object state
• Can be overloaded

• public: Accessible from anywhere
• private: Accessible only within the class
• protected: Accessible within package and subclasses
• default: Accessible only within package

• Bundling data and methods that operate on that data
• Data hiding through private access
• Controlled access through public methods

1. ClassAndObject.java - Basic class and object creation
2. Constructors.java - Constructor examples
3. AccessModifiers.java - Access modifier demonstration
4. Encapsulation.java - Encapsulation principles

1. Compile: javac ClassAndObject.java
2. Run: java ClassAndObject

1. Create a Student class with properties and methods
2. Build a BankAccount class with deposit/withdraw methods
3. Create a Rectangle class with area and perimeter methods
4. Implement a Car class with various properties

• Naming: Class names start with capital letter
• Single Responsibility: Each class should have one purpose
• Encapsulation: Use private fields with public getters/setters
• Constructors: Always provide constructors for your classes

• Classes and Objects
• Constructors

Next Day: Day 08 - Inheritance and Polymorphism