Design pattern Singleton, in a nutshell

Design Pattern Singleton

It’s important for some classes to have exactly one instance. Although there can be many printers in a system, there should be only one printer spooler. There should be only one file system and one window manager. A digital filter will have one A/D converter. An accounting system will be dedicated to serving one company.[3]

There must be exactly one instance of a class, and it must be accessible to clients from a well-known access point.[3]

when the sole instance should be extensible by subclassing, and clients should be able to use an extended instance without modifying their code.[3]

Spring Singleton
Spring Singleton Test
Test result executed on IntelliJ
Quarkus Singleton
Quarkus Singleton Test
Test result executed on IntelliJ
Singleton
Singleton Test
Test result executed on IntelliJ
Enum singleton
Enum Singleton Test
Test execution

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