What is a factory design pattern in Java?
The factory design pattern says that define an interface ( A java interface or an abstract class) and let the subclasses decide which object to instantiate. The factory method in the interface lets a class defer the instantiation to one or more concrete subclasses.
What is factory pattern explain with example?
Example. The Factory Method defines an interface for creating objects, but lets subclasses decide which classes to instantiate. Injection molding presses demonstrate this pattern. Manufacturers of plastic toys process plastic molding powder, and inject the plastic into molds of the desired shapes.
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.
What is factory method in Java example?
Factory method is a creational design pattern which solves the problem of creating product objects without specifying their concrete classes. Factory Method defines a method, which should be used for creating objects instead of direct constructor call ( new operator).
What is factory design?
Factory method is a creational design pattern, i.e., related to object creation. In Factory pattern, we create objects without exposing the creation logic to the client and the client uses the same common interface to create a new type of object.
Where is factory design pattern used?
The Factory Method pattern is generally used in the following situations: A class cannot anticipate the type of objects it needs to create beforehand. A class requires its subclasses to specify the objects it creates. You want to localize the logic to instantiate a complex object.
What is a factory class 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 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 are the types of factory pattern?
the abstract factory pattern, the static factory method, the simple factory (also called factory).
Which are the three types of factory method?
There are 3 types of factory design pattern.
- Simple factory.
- Factory method.
- Abstract factory.
Factory design pattern is used to create objects or Class in Java and it provides loose coupling and high cohesion. Factory pattern encapsulate object creation logic which makes it easy to change it later when you change how object gets created or you can even introduce new object with just change in one class.
What is a factory class in Java?
Answer Wiki. Basically, In Java, A factory method is a method that abstracts away the instantiation of an object. Generally factories are useful when you know that you need a new instance of a class that implements some interface but you don’t know the implementing class.
What is factory method design pattern?
The Factory Method Design Pattern is where you create a class (the factory) which has the sole responsibility of creating other classes. For example, imagine our application can share data with many popular social applications.
The Factory Method design pattern is one of the twenty-three well-known “Gang of Four” design patterns that describe how to solve recurring design problems to design flexible and reusable object-oriented software, that is, objects that are easier to implement, change, test, and reuse. The Factory Method design pattern solves problems like: