Assume the following method is in class$$TestSLList$($a method outside the$$SingleLinked List$$class$).$

public static void Method$3($ SingleLinkedList$$list$,$ E$$item$1,$ E$$item$2)$

$\{$

$$if$($ list.contains$($item$1)$ && list.contains$($item$2))$

$\{$

$$int index$2=$ list.indexOf $($item$2)$;

$$list$.$remove$($index$2)$;

$$list$.$add$($ list.size$(),$ item$2)$;

$\}$

$\}$

What is the purpose of the above method:

$$If both$$item$1$and$$item$2$exist in the$$list$$then the method will delete$$item$1$from the$$list$.$

If both$$item$1$and$$item$2$exist in the$$list$$then the method will delete$$item$2$from the$$list and add item $2$ to the end of the list.

If both$$item$1$and$$item$2$exist in the$$list$$then the method will swap$$item$1$and$$item$2$in the$$list$.$

If both$$item$1$and$$item$2$exist in the$$list$$then the method will delete both$$item$1$ and$$item$2$from the$$list$.$