The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases.
Each thread is associated with an instance of the class
Thread. There are two basic strategies for using Thread objects to create a concurrent application.
Thread each time the application needs to initiate an asynchronous task.This section documents the use of Thread objects. Executors are discussed with other high-level concurrency objects.