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Class-based Object Oriented Programming

By Exforsys | on October 9, 2006 |
OOPS

Class-based Object Oriented Programming

Class-based object oriented programming is a style that gains inheritance by processing classes as objects. The most prominent style of OOP is class-based instead of object-based. With the class-based OOP system, objects are units that merge states, identities, and behaviors.

The foundation and behavior of the object will be characterized by the class, which will act as a diagram of all objects which fall under the same type. The object will need to be constructed on the foundation of a class, and because of this, the object is considered to be the instance of the class that it is based on. The object can be likened to a foundation, and it will have access controls and method pointers.

With class-based OOP, encapsulation will stop users from disrupting the invariants within the class, and this is important because it will permit the classes of objects to be implemented. At the same time, it will not have any adverse effects on the user code. Encapsulation is a concept that deals with the collection and protection of information that is related, and the name for this is cohesion. The vast majority of object oriented programming languages don’t offer security measures which are formal for the state of an object. The method of access is more closely connected to the design of the interface.

In class-based OOP, inheritance will be performed by collecting objects and placing them into classes. Once the objects have been collected as classes, they will be defined as extensions of classes that already exist. The classes will also be presented as a lattice which will show their common behaviors. Using classes with the method of inheritance is extremely popular. In addition to this, programming which is prototype based is popular as well. There are a number of criticisms that have been made against class-based OOP. One of the common issues that have been cited is the combining of interfaces with implementations. This is one of the foundations of object oriented programming.

For example, a group of classes might be constructed, and they could be extended to create a new class which is named a set class. In the set class, the ability to clone objects can be destroyed. If a function is designed that can take the group of classes, it may think that adding more objects can increase the size of the group, but if an object is placed in a set class, the bag may increase in size, but it may also not increase in size as well. This is a problem that is created because subclassing is connected to subtyping, and this is true in cases where the concept of subtyping is not relevant. Because of this, it is important for programmers to separate subclasses from subtyping.

The vast majority of modern programming languages already do this. However, there are some designs which do not separate subclasses from subtyping, and this can cause a number of problems. Another criticism that has been made against class-based OOP is that an object created from a child class is not allowed to become the object of a parent class. The reason for this is because while the child class and parent class can connect to a person class, the vast majority of class-based OOP languages will not permit a change to a specific object class during runtime. They do this so that unified view of the class is maintained.

It is not important for the users to care about any changes that may disrupt the invariants of a class. Another way to make these changes is to delete the object and create a new one to replace it. In addition to this, polymorphism can be utilized to maintain the necessary interfaces whenever a change occurs. The reason for this is because all objects will be seen as being abstractions, and a connection can be made to them through their identities. In most cases, it is the value of the object that may change, and this will cause changes to occur in the code of the client as well. The first programming language to introduce the class-based abstraction is Simula. Some other languages which use this system are Java or C++. It is likely that this system will be used in future programming languages.

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Editorial Team at Exforsys is a team of IT Consulting and Training team led by Chandra Vennapoosa.

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