Google Guava Supplier Example

Question

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

Answer 1

The main reason we included Supplier in Guava was to support the Multimaps methods that generate arbitrary Multimaps, such as

public static  Multimap newMultimap(Map> map,
    Supplier> factory)

The Supplier creates a Collection that holds all of the values for a given key. The Multimap uses the Supplier whenever you store a key-value pair with a key that's not already in the Multimap.