1. Threading in Java – a Tutorial QMUL IEEE SB

2. Why Threading When we need to run two tasks concurrently So multiple parts (>=2) of a program can run simultaneously Process vs Thread (OS concept)

3. Lifecycle of a Thread Ref: http://www.tutorialspoint.com/java/java_multithreading.htm http://www.tutorialspoint.com/java/java_multithreading.htm

4. Creating a Thread Two ways: – Implement Runnable interface – Extend Thread class Creating Thread using Runnable interface, – method: public void run() – All the code for the thread goes here – We can call other methods, make objects of other classes etc within run() – the class that implements Runnable creates an instance of Thread class Thread(Runnable threadOb, String threadName);

5. Example - Creating Thread by Implementing Runnable Ref: http://www.tutorialspoint.com/java/java_multithreading.htm http://www.tutorialspoint.com/java/java_multithreading.htm

8. Output - Creating Thread by Implementing Runnable

9. Create thread by Extending Thread Create a class that extends Thread override the run( ) method call start( ) to begin execution of the new thread

10. Example - Create thread by Extending Thread Ref: http://www.tutorialspoint.com/java/java_multithreading.htm http://www.tutorialspoint.com/java/java_multithreading.htm

11. Output - Create thread by Extending Thread

12. Creating multiple Threads

13. Output - Creating multiple Threads

14. Thread Synchronization Ensuring only one of two or more competing threads get access to the resource Synchronized statement in java synchronized(object) { // statements to be synchronized }

15. Example Code - Synch.java

16. Output - Thread Synchronization

17. Output - Same Example with Unsynchronized Threads

18. Example Code - UnSynch.java

19. References Java – Multithreading, http://www.tutorialspoint.com/java/java_mul tithreading.htm http://www.tutorialspoint.com/java/java_mul tithreading.htm Java - Thread Synchronization, http://www.tutorialspoint.com/java/java_thre ad_synchronization.htm http://www.tutorialspoint.com/java/java_thre ad_synchronization.htm Multithreading, http://www.ccs.neu.edu/course/com3118/Mu ltithreading.html http://www.ccs.neu.edu/course/com3118/Mu ltithreading.html