Question $4/$Vraag $4$

$4\mathrm{.}1$ 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 $\text{'}$n enqueue gevolg deur'n dequeue altyd gelyk wees aan $\text{'}$n dequeue gevolg deur' $n$ enqueue. kommentaar oor die stelling en motiveer jou antwoord.

$4\mathrm{.}2$ Write the Java code for the $1,6^2-$ die pop metode gethe

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

public static QueueAsMylinkedL ist method $($QueueAsKyLinkedList pl$,$ int $x)$

i

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

Integer hold $=($Integer$)$pl$.$ dequeve $()$ :

if $/$hald $==$ nuili