Use the following classes, SimpleArray $($synchronized version$),$ ArrayWrite, and

SharedArrayTest for this program.

Rename the SharedArrayTest class as

Program$9.$ Change the array size to $15,000,000.$ Modified the run method to add

random numbers $($between $1-20)$ to the array. Add a totalArray attribute to the

SimpleArray class to return the sum of the elements in the array.

Use a Fix Thread Pool the size of the number of CPU cores in the system and make

sure you do not populate the array past the end of it$.$ Display the CPU cores of the

system. Remove all the Thread.sleep statements in the methods of the classes

mentioned above. Also, remove all the print statements in the SimpleArray class.

Write a non$-$static method in the Program$9$ class named singleThreadedArray that

creates a simple integer array of size $15,000,000,$ populate it with random numbers

$($between $1-20),$ and return the sum of the members.

Write a non$-$static method in the Program$9$ class named compareTimes. Use the

Date$/$Time API timing techniques described in Section $23\mathrm{.}12$ to compare the time

required for both modules $($the Multi$-$Threaded and the Single$-$Threaded$)$ to run.

All classes in this program must be public, non$-$static and not nested in other

classes.

No input, processing or output should happen in the main method. All work in

the test class should be delegated to other methods in the class.

Every method in your program should be limited to performing a single, well

defined task, and the name of the method should express that task effectively.