### Question:
ArrayDeque { public void printDeque() { for (PlaceholderType p : Array) { System.out.print(p + " "); } System.out.print("\n"); } ArrayDeque(); void addFirst(PlaceholderType item); void addLast(PlaceholderType item); boolean isEmpty(); int size(); void printDeque(); PlaceholderType removeFirst(); PlaceholderType removeLast(); PlaceholderType get(int index);  }### Answer:
@Test public void printDequeTest() { System.out.println("Perform printDequeTest1"); ArrayDeque<Integer> array = new ArrayDeque<>(); array.addFirst(123); array.addLast(234); array.addFirst(345); array.addLast(456); array.printDeque(); }