This chapter has made the reader familiar with the Java collections and the most popular ones - the List, Set, and Map interfaces. The code examples made their functionality more clear. The comments of the code attracted the reader's attention to the possible pitfalls and other useful details.
In the next chapter, we will continue to overview the most popular classes of the Java Standard Library and Apache Commons. Most of them are utilities, such as Objects, Collections, StringUtils, and ArrayUtils. Others are just classes, such as StringBuilder, StringBuffer, and LocalDateTime. Some help to manage collections; others, objects. What is common among them is that they belong to the small set of tools that every Java programmer has to master before they can become effective coders.
