Class is the piece of code where we define the attributes and/or behaviors of an object. You can define variables, constants, methods and constructors to the object, inside the class. In another words, class is the blueprint of an object.

Let's see a sample class in Java, which defines a (simple) Car:

public class Car {
  private Engine engine;
  private Body body;
  private Tire [] tire;
  private Interior interior;

  // Constructor 
  public Car (Engine engine, Body body, Tire[] tires, Interior interior) {
    
  }

  // Another constructor
  public Car () {
    
  }

  public void drive(Direction d) {
    // Method to drive
  }

  public void start(Key key) {
    // Start 
  }
}

This is just for an example. You can model real world object like this, as per your requirement.