Google Guava Supplier Example

Question

Please explain the use of the interface Supplier(in Guava) with a suitable example .

Answer 1

It's a way to provide an indirect object. You may want to provide another object each time Supplier.get() is called.

For example, i have a class called SmtpMailSender, which takes a hostname for the smtp server. However, the hostname can change at runtime, so instead of taking a String hostname, it takes a Supplier<String> hostname.

Answer 2

An example use of Supplier:

http://stackoverflow.com/questions/3636244/thread-safe-cache-of-one-object-in-java/3636791#3636791

Answer 3

See the Suppliers class and I guess the methods there will somehow answer your question.