public class StackQueue {

public static void main(String[] args) {

Stack<String> stack = new Stack<>();

Queue<String> queue = new Queue<>();

stack.push("stack-first");

stack.push("stack-last");

queue.enqueue("queue-first");

queue.enqueue("queue-last");

for (String s : stack)

System.out.println("stack contains " + s);

for (String s : queue)

System.out.println("queue contains " + s);

while (!stack.isEmpty())

System.out.println(stack.pop());

while (!queue.isEmpty())

System.out.println(queue.dequeue());

}

}