July 2017
Beginner to intermediate
715 pages
17h 3m
English
Content preview from Java: Data Science Made Easy
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Commons Collections
The Java Collections API is very powerful and it defines a good set of abstractions for data structures in Java. The Commons Collections use these abstractions and extend the standard Collections API with new implementations as well as new collections. To include the library, use this snippet:
<dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-collections4</artifactId> <version>4.1</version> </dependency>
Some useful collections from this library are:
- Bag: This is an interface for sets that can hold the same element multiple times
- BidiMap: This stands for Bi-directional map. It can map from keys to values and from values to keys
It has some overlap with collections from Google Guava, explained ...
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