JAVA CERTIFICATION QUESTION: TreeSets, LinkedLists, and...

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JAVA CERTIFICATION QUESTION: TreeSets, LinkedLists, and ArrayDeques in Java

· java

Given this code:

Set<String> ss   = new TreeSet<>();
Queue<String> q  = new LinkedList<>();
Deque<String> dq = new ArrayDeque<>(1);
    
ss.add("John");
ss.add("Alan");
    
q.offer("Bert");
q.offer("Kathy");
    
dq.add("Jane");
dq.addFirst("Alex"); // line n1
    
ss.addAll(q);
dq.addAll(ss); // line n2
    
System.out.print(dq);

What is the result? Choose one.

A.	Runtime exception at line n1

B.	Runtime exception at line n2	

C.	[Jane, Alan, John, Bert, Kathy]	

D.	[Jane, Alan, Bert, John, Kathy]	

E.	[Alex, Jane, Alan, Bert, John, Kathy]	

F.	[Alex, Jane, Alan, John, Bert, Kathy]

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