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docs: single table inheritance and singleton diagrams

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Ilkka Seppälä
2025-04-10 20:48:39 +03:00
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@@ -33,6 +33,10 @@ Wikipedia says
> In software engineering, the singleton pattern is a software design pattern that restricts the instantiation of a class to one object. This is useful when exactly one object is needed to coordinate actions across the system.
Sequence diagram
![Singleton Pattern sequence diagram](./etc/singleton-sequence-diagram.png)
## Programmatic Example of Singleton Pattern in Java
Joshua Bloch, Effective Java 2nd Edition p.18