This knolx explains the concept of process API Updates in Java 9. It covers the following topics : 1. Process 2. Process Builder 3. Process Handler 4. Process Handler Info

1. Java 9 - Part II
Jasmine Kaur
Software Consultant (Knoldus)

2. Agenda: Process API Updates
● Process
● Process Builder
● Process Handler
● Process Handler Info

3. New features which came in Java
9● JPMS ( Java Platform Modular System)
● Jshell
● Jlink
● Http2/Client
● ...
● Process API Updates

4. Process API Updates
● Process id of current running process
● Create a new process (Example : open a notepad, compile a java
program)
● Destroy already running process (Example : Close a notepad, stop a
java program)
● Get complete information of a process
● Get child process information
● Get parent process information

5. What’s new in Java 9 Process API ?
● Process class : Several new methods were added like pid(), info() etc
● ProcessBuilder : Use to create our own operating system process
● ProcessHandle interface : Use to handle the processes like access current
running process, access the parent/child of a particular process
● ProcessHandle.Info : Inner interface inside ProcessHandle interface. It is use
to provide the complete information of a current running process.
Note: All these classes and interfaces are present inside java.lang package, so we are
not required to use any import statements.

6. How to get ProcessHandle Object
1. ProcessHandle handle = ProcessHandle.current();
2. ProcessHandle handle = process.toHandle();
// where process is the Process object
3. Optional<ProcessHandle> handle = ProcessHandle.of(PID);

7. ProcessHandle.Info
Info interface provides information snapshot about :
1. Single process
2. All processes

8. ProcessBuilder
This class is used to make the operating system processes.
ProcessBuilder processBuilder = new ProcessBuilder(String... command);
Process process = processBuilder.start();
Note : The argument should be a valid command to invoke the process.

9. Creation and destroying a process
● Create and destroy process from java using
ProcessBuilder.
● Destroy a project which is not created from java.

10. References
● https://www.youtube.com/watch?v=K8Jc_EaBVMI&list=PLd3UqWTnYXOlcXp3b
EgxelRegCgnAvcNe
● https://docs.oracle.com/javase/9/
Java Part-I video :
https://www.youtube.com/watch?v=gvmTZMPBJPo&feature=youtu.be

11. Thank You !