CS520 Module 6 Assignment

CS520 Module 6 Assignment
General Rules for Homework Assignments
 You are strongly encouraged to add comments throughout the program. Doing
so will help your facilitator to understand your programming logic and grade
you more accurately.
 You must work on your assignments individually. You are not allowed to copy
the answers from the others. However, you are encouraged to discuss the
approaches to the homework assignments with your section mates and the
facilitator in your section via the discussion board.
 Each assignment has a strict deadline. However, you are still allowed to submit
your assignment within 2 days after the deadline with a penalty. 15% of the
credit will be deducted unless you made previous arrangements with your
facilitator and professor. Assignments submitted 2 days after the deadline will
not be graded.
 When the term lastName is referenced in an assignment, please replace it with
your last name.
You are strongly encouraged to add comments into your program!
Create a new Java Project in Eclipse named HW6_lastName and complete the
following requirements based on the Threads. Several threads will share a single
object and contribute their individual result to the shared object. The shared object
accumulates the partial results.
Create a package named cs520.hw6. Using this package, create the following
classes.
1. Create a class named SharedResults as follows. The class keeps track of the
shared result.
a.The instance (or member) private variable – result (int).
b.A void addToResult method which takes the given integer argument and
adds it to the shared result. This method then prints to the console the
name of the current thread, the value it added, and the cumulative
result. Handle the synchronization issue with this method.
c. The getResult method with no arguments which returns the shared
result. Handle the synchronization issue with this method.
2. Create a class named LongTask which extends the Thread class.
a. The instance (or member) private variables – sharedData (of
type SharedResults), start (integer) and end (integer).
b. A single constructor which takes the above three arguments and
stores them in the instance values. Also, create a name for this
thread as Thread_<start>_<end>
c.In the run method, add the integer numbers from start to end (both
inclusive) using a for loop. Also, sleep for a random time (up to 10
milliseconds) in each iteration of the loop. After the loop, invoke the
addToResult method of the shared object and provide this
accumulated sum.
3. Create a Test class to test the following functionality in its main method.
a. Create the SharedResults object and assign it to a variable.
b. Create five LongTask objects by passing the above shared
object and the start and end values for each as (1, 100), (101, 200),
(201, 300), (301, 400), and (401, 500) respectively.
c.Start each thread as it is created.
d. Wait for all the threads to complete using the join method.
e. Print the result from the shared object.

 Sample Output:
Different runs of the program will produce the output in different sequences, but the
final result would be the same. Two runs of the program are shown below.
Submission:
Create an archive of your Eclipse project using the following steps. Select the
HW6_lastName project in the Eclipse IDE’s Package Explorer or the Navigator
window.
Click File->Export. Select the General->Archive File option. Click Next.
Specify the “To archive file:” entry as say, C:\Temp\HW6_lastName.zip.
The zip file will be created and stored in the C:\Temp folder.
Submit this zip file as an attachment in the Assignment Section.