Basic HTML version of Foils prepared 18 May 97

Foil 16 Introduction to Threads

From Java Tutorial - Spring 1997 Part 3:Graphics and the Abstract Windowing Toolkit Peking Tutorial, Web Certificate -- Spring-Summer 1997. by Nancy J. McCracken,Geoffrey C. Fox


A thread is a single sequential flow of control within a process.
If a process has more than one thread, then each thread executes concurrently.
Any Java applet which has extensive execution or loops to repaint the window must run as a concurrent thread with the browser window.
To make an applet with a thread, which is almost always recommended:
  • Change your applet definition to add "implements Runnable", the interface for threads.
  • Include an instance variable for the thread of your applet.
  • Have a start() method which creates a thread and starts it running and a stop() method which stops it running.
  • Have a run() method containing the body of your applet code.



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