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.