Java Reference
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is similar to the following sequence that I observed:
7 1 5 2 9 8 6 4 3 0
The following exercises are designed to test your understanding of the concurrency
utilities, Objects , and Random :
1. The Java documentation for the Semaphore class presents a Pool class
that demonstrates how a semaphore can control access to a pool of items.
Because Pool is incomplete, introduce a single resource (replace pro-
tected Object[] items = ... with an array containing this re-
source in its single entry) and then demonstrate Pool 's getItem() and
putItem() methodsinthecontextofapairofthreadslaunchedfromthe
main() method of a SemaphoreDemo class.
2. Create an EqualsDemo application to play with Objects ' deep-
Equals() method.Aswellasan EqualsDemo class,thisapplicationde-
clares Car and Wheel classes. A Car instance contains (typically four)
Wheel instances, and a Wheel instance contains a brand name. Each of
Car and Wheel must override Object 's equals() method but does
nothavetooverride hashCode() inthisexample.Your main() method
Car[] cars1 = { new Car(4, "Goodyear"), new Car(4,
"Goodyear") };
Car[] cars2 = { new Car(4, "Goodyear"), new Car(4,
"Goodyear") };
Car[] cars3 = { new Car(4, "Michelin"), new Car(4,
"Goodyear") };
Car[] cars4 = { new Car(3, "Goodyear"), new Car(4,
"Goodyear") };
Car[] cars5 = { new Car(4, "Goodyear"), new Car(4,
new Car(3, "Michelin") };
cars2)); // Output: true
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