Java Challenges: 100+ Proven Tasks that Will Prepare You for Anything

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2022

M. IndenJava Challengeshttps://doi.org/10.1007/978-1-4842-7395-1_7

7. Basic Data Structures: Lists, Sets, and Maps

Michael Inden¹  

(1)

Zurich, Switzerland

 

In the Collections framework, lists, sets, and maps as key-value stores are implemented by so-called container classes . They manage objects of other classes. The interfaces List<E>, Set<E>, and Map<K,V> from the package java.util serve as the basis for the container classes. They store object references. Thus, processing primitive types is only possible if they are converted to a wrapper object (such as Byte, Integer, or Double). This is done automatically by the auto-boxing/unboxing implicit since Java ...