Class

A class is a blueprint for creating objects. It defines the state (fields) and behavior (methods) of objects.

class Car {
    String color;
    int speed;
    
    void drive() {
        System.out.println("Driving...");
    }
}
 
Car myCar = new Car();
myCar.color = "Red";
myCar.drive(); // "Driving..."

Class Components

Component	Example
Fields	String name;
Methods	void speak() { ... }
Constructor	Car() { ... }
Blocks	Static / instance initializer blocks
Nested Classes	Inner or static nested classes

Comparison

Class vs Object

Term	Meaning
Class	Blueprint / definition
Object	Instance of a class (real-world item)

Types of Classes in Java

Type	Example Use Case
Regular	Standard usage
Abstract Class	Partial implementation
Final	Cannot be extended
Anonymous Class	One-time use, inline declaration
Inner/Nested	Grouped logic within outer class

Tip

Be able to explain the structure of a class, how to instantiate objects and the difference between class vs object.
Also expect questions on constructors, access modifiers or OOP principles via classes.

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Parent: _OOP