Chapter 9

1. Processes, in the context of Java application programming, are executional units in the operating system. When you start a program, you start a process.

2. Two new interfaces were introduced in Java 9 that support handling operating system processes: ProcessHandle and ProcessHandle.Info.

3. The handle.is.Alive() method returns false when the process finishes.

4. We can gain access to the PID of the processes via the handle.
   The handle.getPid() method returns Long, representing the numerical value of the PID.

5. To get the PID of the current process, the call chain ProcessHandle.current().getPid() can be used.

6. command(), arguments(), commandLine(), startInstant(), totalCpuDuration(), user().

7. To get the Stream of process handles for controlling children, the static method processHandle.children() should be used.

8. processHandle.descendants().

9. allProcess().

10. CompletableFuture...