Polymorphism in software engineering ppt

The phrase polymorphism suggests that it has multiple forms. We may define polymorphism, in simple words, the capacity of a communication to be shown in more than one shape.

An example of polymorphism in real life: An individual may have distinct characteristics at the same time. Like a man, he is a father, a husband, and an employee at the same time.

Still, as there are many inheritances, the Dove class is known to be polymorphic. For the examples listed above, the following is true:. The following assertions are valid when we attach the subject variable information to a Dove object reference.

To solve problems in computer science and programming, there are several common methods of applying polymorphism. Five different ways of polymorphism that are widely used in different programming languages are briefly listed below. Ad-hoc polymorphism mentions the principle that, based on the kind of arguments on which it is applied, a similar function can be applied to different arguments and can work accordingly.

In many ways, this operator can be used, including integer extension, floating-point extension, array concatenation, and string concatenation. When a single operator, based on the type of argument, executes multiple functions, we conclude that the operator is overloaded. Ad-hoc polymorphism is often appropriately referred to as function overloading of operator overloading. We specified a class called curves in the above example and derived classes called circles and rectangles.

In subtyping, we describe a super type that can have many subtypes that may also act on the various subtypes where separate functions or subroutines have been written to run on the super type. Each subtype is a super type variety which shares some, but not all, of its features. Subtype polymorphism enables a feature to even act on objects that correspond to all of the subtypes of dogs that would usually run on a dog-type object.

You can write a formula that takes a dog as a parameter, but since a basset hound is a subtype of dog, you can use basset hounds as a parameter as well. Parametric polymorphism enables programmers to write generic functions that, irrespective of their type, can handle values the same way. Put differently, a parametric function is a piece of code that, regardless of its form, handles all data in the same way.

Parametric polymorphism is used, irrespective of the particular form of each element in the package, to write generic functions which operate on data sets.

In generic programming, Polytypism, also referred to as data form genericity, is used. Programmers design algorithms in generic programming where the forms can be defined at a later stage.

The appropriate types can be given as parameters when the algorithm is instantiated at a later stage. A generic category is also defined as a type that is parameterized. A special form of polymorphism that deals with records in databases or spreadsheets, generally referred to as rows, is row polymorphism. It is possible to use row polymorphism to write programs that run only on a given portion of a list.

In order to build malicious code and scripts that alter the type, cyber attackers use polymorphism, including modifying their file name, encryption and compression tools.

With anti-malware software, these systems are progressively difficult to spot. Sumo Logic lets market enterprises detect ransomware and other unintended intrusions through behavior-based threat identification techniques that are more appropriate than conventional signature-based detection techniques for detecting polymorphic malware.

Where the implementation is chosen, polymorphism can be defined by: constantly or dynamically. This is classified as static send and dynamic send, respectively, and static polymorphism and dynamic polymorphism are also considered the related modes of polymorphism. Dry: A Memoir Augusten Burroughs. Related Audiobooks Free with a 30 day trial from Scribd. Here one form represent original form or original method always resides in base class and multiple forms represents overridden method which resides in derived classes.

The word "poly" means many and morphs means forms. In static polymorphism memory will be allocated at compile-time. In dynamic polymorphism memory will be allocated at run-time. These Operators have only single operand.

These operators can have two or more operands. Special Thanks To:- Mrs. Rajrupa Metia Asst. Anithaa47 Nov. Vasanth Goud Oct. RahulChoudhary Jun. Kiran BG Nov. Rohit Mhatre Oct. Show More. Due to the different sets of parameters, each method has a different signature. That signature allows the compiler to identify which method to call and binds it to the method call.

This approach is called static binding or static polymorphism. The BasicCoffeeMachine class implements two methods with the name brewCoffee. The first one accepts one parameter of type CoffeeSelection. The other method accepts two parameters, a CoffeeSelection , and an int. When you call one of these methods, the provided set of parameters identifies the method which has to be called. At compile time, the Java compiler binds this method call to the brewCoffee CoffeeSelection selection method.

If we change this code and call the brewCoffee method with a CoffeeSelection object and an int , the compiler binds the method call to the other brewCoffee CoffeeSelection selection, int number method. The JVM needs to do that at runtime. Within an inheritance hierarchy, a subclass can override a method of its superclass, enabling the developer of the subclass to customize or completely replace the behavior of that method.

Doing so also creates a form of polymorphism. Both methods implemented by the super- and subclasses share the same name and parameters.

However, they provide different functionality. Both classes provide an implementation of the brewCoffee CoffeeSelection selection method.

If you read our post about the OOP concept inheritance, you already know the two implementations of the brewCoffee method. If the action gets called with any other CoffeeSelection , it uses the keyword super to delegate the call to the superclass. Sometimes, you want to use an inheritance hierarchy in your project.

To do this, you must answer the question, which method will the JVM call? The answer manifests during runtime because it depends on the object on which the method gets called.

The type of the reference, which you can see in your code, is irrelevant. You need to distinguish three general scenarios:.

The first scenario is pretty simple.