Getting information about a process

To get information about a process, we need access to the Info object of the process. This is available through a ProcessHandle. We use a call to the handle.info() method to return it.

The Info interface defines query methods that deliver information about the process. These are:

• command() returns an Optional<String> containing the command that was used to start the process
• arguments() returns an Optional<String[]> that contains the arguments that were used on the command-line after the command to start the process
• commandLine() returns an Optional<String> that contains the whole command-line
• startInstant() returns an Optional<Instant>, which essentially represents the time the process was started
• totalCpuDuration() returns an Optional<Duration>, which represents the CPU time used by the process since it was started
• user() returns an Optional<String> that holds the name of the user the process belongs to

The values returned...