In this chapter, we discussed and demonstrated how the data in a database can be populated, read, updated, and deleted from a Java application. A short introduction to the SQL language described how to create a database and its structure, how to modify it, and how to execute SQL statements, using Statement, PreparedStatement, and CallableStatement.
In the next chapter, we will describe and discuss the most popular network protocols, demonstrate how to use them, and how to implement client-server communication using the latest Java HTTP Client API. The protocols reviewed include the Java implementation of a communication protocol based on TCP, UDP, and URLs.
