What is the advantage of using Supplier in Java?

Question

Reading about the new Supplier interface I can\'t see any advantage of its usage. We can see bellow an example of it.

class Vehicle{
  public void drive(){ 
             


        

Answer 1

In your example above I'd not use a supplier. You are taking a Vehicle to drive, not requesting vehicles.

However to answer your general question:

• Because building a car is expensive and we don't want to do it until we really really need to.
• Because we want X cars not just one.
• Because the time of construction for a car is important.
• Because construction is complicated so we want to wrap it up.
• Because we don't know which Vehicle to return until we return it (maybe it will be a new one, maybe a recycled one, maybe a wrapper, who knows)