Question

Which class that can have only one instance?

(a) Adaptor Class

(b) Proxy Class

(c) Singleton Class

(d) Factory class

This question was posed to me in a dream while sleeping

This interesting question is from The Generator Category, Factory Patterns and Singleton Patterns in division Visibility, Accessibility and Information Hiding of Software Architecture

Answer 1

The correct choice is (c) Singleton Class

Best explanation: Singleton Class is the class that can have only one instance.