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Explanatory Question

Write a difference between class and a object

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Answer with Explanation

Here’s a concise table comparing class and object in Java:

Aspect Class Object
Definition A blueprint or template for creating objects. An instance of a class.
Purpose Defines properties (fields) and behaviors (methods). Represents a specific entity with data and behavior defined by its class.
Memory Does not occupy memory until an object is created. Occupies memory when instantiated.
Structure Abstract and logical; a concept. Concrete and physical; a real entity.
Usage Used to define and encapsulate data and behavior. Used to access the data and behavior defined by the class.
Declaration Defined using the class keyword. Created using the new keyword or other methods.
Example in Code class Car { int speed; void drive() {} } Car myCar = new Car();

Example

Defining a Class


class Car {
    int speed;             // Property
    void drive() {         // Behavior
        System.out.println("The car is driving.");
    }
}

Creating an Object: 


public class Main {
    public static void main(String[] args) {
        Car myCar = new Car(); // Object creation
        myCar.speed = 100;     // Accessing property
        myCar.drive();         // Calling method
    }
}

Output: 


The car is driving.

Key Takeaway

  • A class is a blueprint for creating objects, while an object is an actual instance of a class, containing real data and behavior.