Sunday, 23 September 2018

Introduction To Design Pattern

Design pattern represents the best practices evolved over a period of time by experienced software developers. They promote reusability which leads to a more robust and maintainable code.
The Design patterns can be classified into three main categories:

  1. Creational Patterns
  2. Behavioral Patterns
  3. Functional Patterns

1.What is Singleton Pattern
Singleton pattern is a creational pattern which allows only one instance of a class to be created which will be available to the whole application. The major advantage of Singleton design pattern is its saves memory because the single instance is reused again and again; there is no need to create a new object at each request. For example, in our application, we can use a single database connection shared by multiple objects, instead of creating a database connection for every request.

2.What are the drawbacks of using singleton design pattern?
The major drawbacks of using singleton design pattern are:
a)Singleton causes code to be tightly coupled. The singleton object is exposed globally and is available to a whole application. Thus, classes using this object become tightly coupled; any change in the global object will impact all other classes using it.
b)Singleton Pattern does not support inheritance.

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