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Docs/singleton comparison #3529

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Add notification service example to Factory Method README
shabinfrancis Jun 8, 2026
690b4b8
docs: add comparison table for singleton implementations
shabinfrancis Jun 20, 2026
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3 changes: 3 additions & 0 deletions factory-method/README.md
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Expand Up @@ -31,6 +31,9 @@ Real-world example
In plain words

> It provides a way to delegate the instantiation logic to child classes.
>
> Imagine a messaging app that can send notifications by Email, SMS, or Push Notifications.
> The user only asks to send a message. The Factory Method chooses and creates the correct notification service
Wikipedia says

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11 changes: 11 additions & 0 deletions singleton/README.md
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Expand Up @@ -37,6 +37,17 @@ Sequence diagram

![Singleton Pattern sequence diagram](./etc/singleton-sequence-diagram.png)

## Singleton Implementation Comparison (for eager and lazy initialization)

| Feature | Eager Initialization | Thread-Safe Lazy Initialization |
|----------|----------|----------|
| Object Creation | During class loading | First call to `getInstance()` |
| Thread Safe | Yes | Yes |
| Synchronization Required | No | Yes |
| Memory Usage | Higher | Lower |
| Performance | Faster access | Slight synchronization overhead |
| Complexity | Simple | Moderate |

## Programmatic Example of Singleton Pattern in Java

Joshua Bloch, Effective Java 2nd Edition p.18
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