Creational Design pattern – Provides best possible approaches of creating objects.

Major adv is new developers can easily read code, as these patterns are popular.This leads to readability, highly maintainable code.Industry standard approach to solve a recurring problem.('Value from third instance is : ' + third. ('Value from third instance is : ' + third.text) ('Value from second instance is : ' + second.text) ('Value from first instance is : ' + first.text) SingletonClassDemo third = SingletonClassDemo.getInstance() instantiating SingletonClassDemo class with variable third SingletonClassDemo second = SingletonClassDemo.getInstance()

instantiating SingletonClassDemo class with variable second SingletonClassDemo first = SingletonClassDemo.getInstance() instantiating SingletonClassDemo class with variable first Public static SingletonClassDemo getInstance() static method to create instance of SingletonClassDemo class Text = 'THIS IS SINGLETON EXAMPLE FROM EDUBCA ' private constructor restricted to this class itself Private static SingletonClassDemo instance = null static variable instance of type SingletonClassDemo The below code example shows the creation and usage of a singleton class: A singleton design pattern involves creating a singleton class that returns the same instance every time it is instantiated. Now we will see java code examples of singleton design patterns. Using Design patterns makes the analysis and requirement gathering stage of SDLC easy.Design patterns are a well-tested and universally accepted way of code development.Design patterns provide code transparency while designing an application.Using Design patterns makes our code easy to understand, even for beginner level developers. Easy to Understand and Debug: Design patterns are defined and accepted patterns that make our code easy to understand and debug in case of errors.Code Reusability: Using Design patterns increases code reusability, which results in the development of robust, maintainable and testable code.This leads to the development of consistent code by different developers. Standard Approach: Using design patterns is considered a standard approach in java understood by all developers.The following are the main reasons why should we go for design patterns in java:

Design patterns in java