In this chapter we explored several changes to the Java 9 platform with the common theme of command-line flags. Specifically, we covered unified JVM logging, compiler control, new diagnostic commands, removal of the HPROF heap profiling agent, the removal of the JHAT, command-line flag argument validation, and the ability to compile for older platform versions.
In the next chapter, we will focus on best practices with additional utilities provided with the Java 9 platform. These will include UTF-8, Unicode 7.0, Linux, and more.
