Class Object and Instance

1. Class

• A blueprint / template for creating objects.
• It defines fields (data) and methods (behavior).
• Does not occupy memory until you create an object.

class Car {
    String color;
    void drive() {
        System.out.println("Driving...");
    }
}

2. Object

• A runtime entity created from a class.
• When you do new Car(), Java allocates memory and creates an object.
• Objects hold actual values in their fields.

Car car1 = new Car();  // object created
car1.color = "Red";

Here,car1is an **object** of classCar`.

3. Instance

• “Instance” is another word for object, but emphasizes the relationship with its class.
• You can say:
  • car1 is an object of type Car.
  • car1 is an instance of class Car.

差不多一个意思

👉 The difference is mostly in wording:

• object → physical entity in memory.
• instance → conceptual: “this object belongs to that class”.