$4\mathrm{.}1$ The enqueue and dequeue operations are inverses of each other. Therefore, performing an enqueue followed by a dequeue is always equivalent to performing a dequeue followed by an enqueue. Comment on this statement and motivate your response. I Die enqueue en dequeue bewerkings is inverse van mekaar. Daarom sal'n enqueue gevolg deur' $n$ dequeue altyd gelyk wees aan $\text{'}$n dequeue gevolg deur' $n$ enqueue. Gee kommentaar oor die stelling en motiveer jou antwoord.

$4\mathrm{.}2$ Write the Java code for the pop method implemented with the MyArrayList class. I Skryf die Java kode vir die pop metode ge$$mplementeer met die MyArrayList klas.

$(4)$

$4\mathrm{.}3$ Study the code in the method below and provide the correct output for the test program. $/$ Bestudeer die kode van die metode hieronder en gee die korrekte afvoer vir die toetsprogram.

$(5)$

Dublic static QueueAsMyLinkedList method $($QueueAsMyLinkedList pl$,$ int $x)$

$\{$

QueueAsMylinkedlist tmp $=$ new QueueAsMylinkedList$()$:

Integer hold Integer