Method shiftStacks

java/Chapter 3/Question3_5/MyQueue.java:25–31

()

	 * do operations on stackOldest.
	 */
	private void shiftStacks() {
		if (stackOldest.isEmpty()) { 
			while (!stackNewest.isEmpty()) {
				stackOldest.push(stackNewest.pop());
			}
		}
	}
	
	public T peek() {
		shiftStacks();