Singleton Design Pattern Implementation in Java смотреть онлайн

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******************** 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-design-pattern

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