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What is a singleton class in Java Singleton design pattern automateNow
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► Do you have any Query? Kindly message us on WhatsApp https://wa.me/message/VLQEBSCSNL73P1 . We won't pick calls, just WhatsApp Messages. • • ► Download Our Programming Line Mobile App To Get Complete Courses For Low Fee: https://bit.ly/3xuPnK1 • ******************** Singleton Design pattern: • → Singleton pattern belongs to the creational pattern. • → This pattern was discovered by Gang of four. (Gang of four design patterns) • → It allows one instantiation or object for JVM • Rules for singleton design pattern: • → The constructor should be private. • private Singleton() • { • } • We can not create an object outside of the class. • → Singleton singleton=new Singleton() //Not possible to create an object using new keyword because the constructor is private • When to use the Singleton Design Pattern? • → There are cases where we need to only one instance for the full lifecycle. • Example: Database connection for every object is costly. We need to reduce that by creating only one instance using Singleton Design Pattern. • Advantages of the singleton design pattern: • → It controls multiple object creations by allowing only one-time creation. • → Use cases of a singleton design pattern: • → Logging is a popular use of Singletons. It provides one single access point to an applications log file. • → Issues with singleton design pattern: • → If two threads call the getInstance() method at the same time, you can end up with two singletons. • → If we make getInstance() method synchronized then it solves the issue, but we need to sacrifice performance because synchronized getInstance() is a costly operation. • → Singleton Desing Pattern has been used in many programming platforms like Java, C++, C, and etc. • For more details and code check out: https://programmingline.com/singleton... • ******************************************************* • Java Course: • Java tutorial • in Tamil | Java course... • Software Design Patterns Course: • Software Design Patterns in Tamil • OOPs Course: • OOPs concepts in Tamil | Object Orien... • NLP Course: • Natural Language Processing 101 in Tamil • Software Interview Tips: • Software Interview tips in Tamil • • ******************************************************* • Subscribe my YouTube channels: • ►Subscribe https://www.youtube.com/programmingli... this channel for watching Software Related courses like Java, Software Design Patterns, OOPs, and etc in Tamil, Telugu, and English. • ►Subscribe / @roadtoinvestment7954 this channel for watching Income Tax saving schemes and Stock Market related videos. • ►Subscribe / @rakesh-ms7tn this channel for watching Terrace Gardening Tips, Unboxing products, and Random videos in Tamil, Telugu, and English. • ******************************************************* • Udemy courses link with huge discount: • Flat 35% off for all the courses for the first 1000 students. • Actual price is $20. Discounted price is $13 for the first 1000 students. • My Java courses on Udemy online learning platform: • Java course in English Udemy course: http://bit.ly/2SoZPOy • Java course in Tamil Udemy course: http://bit.ly/2PbcOBb • Java course in Telugu Udemy course: http://bit.ly/2zzoEzY • My Software Design Pattern courses on Udemy online learning platform: • Software Design Patterns in English Udemy course: http://bit.ly/2AEYZpC • Software Design Patterns in Tamil Udemy course: http://bit.ly/2PcuXyp • Software Design Patterns in Telugu Udemy course: http://bit.ly/2rhsZTY • ********************************************************* • ******************************************************* • Website: www.programmingline.com • FaceBook page: / programminglineofficial • Instagram: / programmingline • Twitter: / programmingline • ******************************************************* • #singleton #softwaredesignpatterns #programmingline #rakesh #rake • #programmingline #rakesh
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