Is polymorphism a design pattern?

Basic difference : Polymorphism is programming language concept, and Strategy pattern is one of behavioral design pattern of GoF. Polymorphism is the provision of a single interface for several different underlying data types.

What is a factory design pattern in Java?

The Factory Design Pattern or Factory Method Design Pattern is one of the most used design patterns in Java. According to GoF, this pattern “defines an interface for creating an object, but let subclasses decide which class to instantiate. The Factory method lets a class defer instantiation to subclasses”.

What is polymorphism Java example?

Polymorphism is one of the OOPs feature that allows us to perform a single action in different ways. For example, lets say we have a class Animal that has a method sound() . Since this is a generic class so we can’t give it a implementation like: Roar, Meow, Oink etc.

Where is factory pattern used in Java?

The factory design pattern is used when we have a superclass with multiple sub-classes and based on input, we need to return one of the sub-class. This pattern takes out the responsibility of the instantiation of a class from the client program to the factory class.

Which are the three types of factory method?

There are 3 types of factory design pattern.

• Simple factory.
• Factory method.
• Abstract factory.

What is an object factory in Java?

In object-oriented programming (OOP), a factory is an object for creating other objects – formally a factory is a function or method that returns objects of a varying prototype or class from some method call, which is assumed to be “new”.

What is polymorphism give an example?

A real-life example of polymorphism, a person at the same time can have different characteristics. Like a man at the same time is a father, a husband, an employee. So the same person posses different behavior in different situations. This is called polymorphism.

What is the difference between design patterns and polymorphism?

Because, while polymorphism is used to implement the patterns in OO languages, but the patterns can be implemented without it (for example, imagine implementing a factory in C). Additionally, design patterns are, like polymorphism, tools that help developers solve problems.

What is polymorphism in Java and how to use it?

To solve this, polymorphism in Java allows us to create a single method render () that will behave differently for different shapes. Note: The print () method is also an example of polymorphism. It is used to print values of different types like char, int, string, etc.

How to implement polymorphic constructors in Java?

Now Let’s look at the implementation. 1. Define a factory method inside an interface. 2. Let the subclass implements the above factory method and decide which object to create. In Java constructors are not polymorphic, but by allowing subclass to create an object, we are adding polymorphic behavior to the instantiation.

What is the use of factory method in interface in Java?

The factory method in the interface lets a class defer the instantiation to one or more concrete subclasses. Since this design patterns talk about instantiation of an object and so it comes under the category of creational design pattern.