$5.$ Two approaches used to write the specifications for operations between a sender and a receiver object $($e$.$g$.,$

Queue$)$ are based on design by contract and defensive design.

$($a$)$ Briefly describe each of the two approaches to writing such a specification.

$($b$)$ State how each approach affects the testing process and relate it to the Queue class where possible.

$($c$)$ Draw a state machine specifying the operations for a Queue.

$($d$)$ Using an IDE $($e$.$g$.,$ Eclipse$)$ write well$-$documented code for the Queue class using the defensive design

approach $($QueueDD$).$ Assume the Queue stores Integer objects with a maximum size of $5$ objects. The

Queue must be implemented using a LinkedList from the Java library. If you copy the code from the

Internet or a textbook, please show the reference in the documentation.Ple