What are common mistakes when implementing the Singleton pattern?

What are common mistakes when implementing the Singleton pattern?

Some common mistakes include not handling multithreading properly, failing to make the constructor private, and not ensuring lazy initialization.

Can you explain why multithreading is a problem?

Sure! If multiple threads access the Singleton instance simultaneously, it can lead to multiple instances being created, violating the Singleton principle.

What is lazy initialization?

Lazy initialization is a design pattern where the instance of the Singleton is created only when it is needed, rather than at startup.

How can I ensure thread safety in a Singleton?

You can use synchronized methods, double-checked locking, or the Bill Pugh Singleton design to ensure thread safety.