What are the real world applications of the singleton pattern?

Question

Duplicate

On design patterns: When should I use the singleton?

class Singleton
{
    private static Singleton instance;

    private Singleton() {}

             


        

Answer 1

You could find the singleton pattern useful if you have a resource that costs a lot to get initialized, and that you use several times, such as an object context when you use an ORM or a connection of some sort.

Obviously you must pay attention that keeping that thing alive does not cost you more than recreating it every time.