Now the module path (the src directory) has two modules. We can now run the javac command to compile all classes in both modules, since we are supplying src as the module source path.
Here, packt.sortutil is the simpler of the two modules. Since it doesn't have any external dependencies, this should just work like the packt.addressbook module did in the previous chapter. Let's look at the packt.addressbook module. Things are more interesting here. Since we've moved the sort related classes to the packt.sortutil module, the packt.addressbook module doesn't have the classes in the packt.util package anymore. But there is code in the module that still uses it. Notice what happens when we try to compile both the modules with the same command as the previous chapter. This time, since we are compiling two modules, we specify both the module names to the --module argument separated by a comma.
$ javac -d out --module-source-path src --module packt.addressbook,packt.sortutil...