What are the practical use differences between Flyweight vs Singleton patterns?

Question

The two pattern seems to achieve the same thing. What are the different use cases in real world? Thanks

Answer 1

They are unrelated:

Flyweight is reusing (obviously immutable) instances of a class wherever possible, rather than creating new instances of a class with the same "value", which saves CPU and memory.

Singleton is when there is only ever one instance of a (usually mutable) class. It is often used in multi-threaded environments to facilitate all threads using a single instance and "seeing" the same state.