package algs13;
import stdlib.*;
public class XReverseQueue {
  public static void main(String[] args) {
    Trace.drawStepsOfMethod ("main");
    Trace.run ();
    Queue<String> q = new Queue<> ();
    q.enqueue ("a");
    q.enqueue ("b");
    q.enqueue ("c");
    q.enqueue ("d");
    Stack<String> stack = new Stack<>();

    while (!q.isEmpty())
      stack.push(q.dequeue());
    while (!stack.isEmpty())
      q.enqueue(stack.pop());
    
    // another version with temporaries:
//    while (!q.isEmpty()) {
//      String x = q.dequeue ();
//      stack.push(x);
//    }
//    while (!stack.isEmpty()) {
//      String x = stack.pop ();
//      q.enqueue(x);
//    }
  }
}