Java ProcessBuilder.start() is a method in the Java ProcessBuilder class that starts the external process as specified by the command and arguments set in the ProcessBuilder. It returns a Java Process object that can be used to manage the execution of the process. Introduced in Java 1997 with Java 1.1, start() is used to launch external programs or system commands from a Java application.

https://docs.oracle.com/javase/8/docs/api/java/lang/ProcessBuilder.html