What exactly is an Object in Java?

In Java, an object is a real-world entity that has:

  • State (also called attributes or fields)
  • Behavior (also called methods or functions)
  • Identity (each object is unique, even if they have the same state)

🔹 Example from real life:

Car

  • State: color = red, speed = 80km/h
  • Behavior: accelerate(), brake()

So, a car object in Java would hold this information and define how the car behaves.

🔸 In Java terms:

An object is an instance of a class.

class Car {
    String color;
    int speed;

    void accelerate() {
        speed += 10;
    }
}

public class Main {
    public static void main(String[] args) {
        Car myCar = new Car(); // object created
        myCar.color = "Red";
        myCar.speed = 80;
        myCar.accelerate();    // method call
    }
}

🧠 Summary:

  • Class = blueprint
  • Object = actual product built using the blueprint
  • Objects are stored in heap memory

 

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