Hi,

Google Guava is open source library in Java which most developed by the engineers at Google.

Google Guava library includes:

• new collection types (such as multimap and multiset)

• immutable collections

• a graph library

• functional types

• it also have an in-memory cache libraries

• It also contains APIs/utilities for concurrency, I/O, hashing, primitives, reflection, string processing, and much more!

Following is the dependency code that you need to add in pom.xml file:

<dependency>
  <groupId>com.google.guava</groupId>
  <artifactId>guava</artifactId>
  <version>21.0</version>
</dependency>

Thanks