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BJP5 Self-Check 14.16: stackQueueMystery1

Language/Type: Java Collections mystery Stacks and Queues
Author: Marty Stepp (on 2019/09/19)

Write the output produced when the following method is passed each of the following stacks: 

public static void mystery1(Stack<Integer> s) {
    Queue<Integer> q = new LinkedList<Integer>();
    while (!s.isEmpty()) {
        int n = s.pop();
        q.add(n);
        q.add(n);
    }
    while (!q.isEmpty()) {
        s.push(q.remove());
    }
    System.out.println(s);
}
[2, 6, 1]
[42, -3, 4, 15, 9]
[30, 20, 10, 60, 50, 40]

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