Introduction
Threads Overview
  Demo 1   Demo 2
Stopping Threads
Multi-Processing
Thread Tasks
Animations
  Demo 3   Demo 4  
  Demo 5
Non-interacting
  Demo 6
Task Splitting
  Demo 7
Exclusivity
  Demo 8
Communicating
  Demo 9
Priority/Scheduling
More Thread
Exercises

    Supplements
Java2D Animation
  Demo 1 
Processor View
More Concurrency
Cloning
  Demo 2  Demo 3 

The determination of when threads run is left up to the JVM implementation to allow maximum flexiblity for the various applications of Java.

Threads are assigned priorties between 1 (lowest) to 10 (highest). A thread can set its own thread up or down in priority. Three standard priority values are defined:

  MIN_PRIORITY
  NORM_PRIORITY
  MAX_PRIORITY

For example,

  ...
  Thread threadX = new Thread(this);
  threadX.setPriority (Thread.NORM_PRIORITY + 1);
  threadX.start ();
  ..

For threads at the same priority, once one of them starts running, it continues until one of the following happens:

• Sleeps - sleep() or wait() called
• Waits for a lock in a synchronized method
• Blocks on I/O such as a read()
• Yields control with a yield() call
• Terminates - e.g. returns from run()

As discussed earlier, preemptive or time-slicing context switching, which is available on some JVMs, also will move threads of the same priority in and out of the virtual processor

Latest update: Nov. 8, 2004

              Tech
Timers
  Demo 1
Hist. Adapt Range
  Demo 2
Sorting in Java
  Demo 3
Histogram Median
  Demo 4
Refactoring
  Demo 5
Error Bars
  Demo 6
Exercises

           Physics
Least Squares Fit
  Demo 1
Fit to Polynomial
  Demo 2
Fit Hist Errors
  Demo 3
Discretization
  Demo 4
Timing
  Demo 5
Exercises