In this chapter, the reader has learned about the content of Java standard libraries included in the JDK and some of the most popular external libraries or third-party libraries. In particular, we have looked closely into the standard packages java.lang and java.util; compared the packages java.io and java.nio, java.sql and javax.sql, java.awt, javax.swing and javafx; and reviewed the packages java.net and java.math.
We have also made an overview of such popular external libraries as org.junit, org.mockito, org.apache.log4j, org.slf4j, and several packages of the Apache Commons project: org.apache.commons.io, org.apache.commons.lang and org.apache.commons.lang3, and org.apache.commons.codec.binary.
The next chapter will help the reader to become familiar with the most widely used Java classes in more detail. The code examples will illustrate the discussion of the functionality...
