So now continuing to the Blog series I will talk about the inheritance concept in this post. In previous blogs, we have seen how to create classes and objects and we can create as many classes as we want. But sometimes we observe that many classes have some properties same as another class. We should keep in mind a fact that creation of an object in memory is a very expensive task and we have to minimize it so one of the methods to do so is Inheritance. So there are two terms: Parent Class and Child Class. The parent class has some features and the child class has similar features along with some extra specific features and the child can be inherited from the parent class so that there is no redundancy. Image source Google So talking about the above image we can see that the vehicle is the parent class and then the car, motorcycle, truck are child class of vehicle and following that again station wagon, jeep are the child class of car and so on. ...
In the previous post, I have discussed Classes and Objects and continuing to that in this post I will cover Constructors. So what a constructor is? As in the previous post, we have created an object car inside the main function using the new keyword, it only creates a generic object without any properties or we can say it is just a spot in memory. And in the next few lines when we assign values to their attributes then it is completely constructed. Although, constructing directly inside the main function is a good idea but there is another way also by which we can form a constructor inside the class itself. But stop I am forgetting something. Before we go deep into constructors I want to tell you something about a very important thing this . this is used to denote the current value. Maybe it is not making sense at this time but it will be clear once we use it. Now coming back to constructors, it is a function or method like entity but without any return type. There are thr...