Summary
In this chapter, we provided an overview of the functionality of the most popular packages of JCL – that is, java.lang, java.util, java.time, java.io, java.nio, java.sql, javax.sql, java.net, java.lang.math, java.math, java.awt, javax.swing, and javafx.
The most popular external libraries were represented by the org.junit, org.mockito, org.apache.log4j, org.slf4j, and org.apache.commons packages. These help you avoid writing custom code in cases when such functionality already exists and can just be imported and used out of the box.
In the next chapter, we will talk about Java threads and demonstrate their usage. We will also explain the difference between parallel and concurrent processing. Then, we will show you how to create a thread and how to execute, monitor, and stop it. This will be useful not only for those who are going to write code for multi-threaded processing but also for those who would like to improve their understanding of how JVM works, which...
