Explanation:The program defi nes four classes: the Queue class, the Producer class, the Consumer
class and the JPS11 class. The Queue class defi nes two data members: Item and a fl ag . The Item is used
to store the value placed on the queue by the Producer . The flag variable is used as a sign indicating
whether a value has been placed on the queue. This is set to false by default, which enables the producer to
place a value on to the queue. The Queue class also defi nes a get() method and a put()method. The
put() method is used to place a value on to the queue (that is to assign a value to the Itemvariables). ...
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