### Question:
ArrayDeque { public PlaceholderType get(int index) { if (index >= this.Array.length) { return null; } else { return this.Array[index]; } } 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 getTest() { System.out.println("Perform getTest"); ArrayDeque<Integer> array = new ArrayDeque<>(); array.addFirst(123); array.addLast(234); array.addFirst(345); array.addLast(456); System.out.println(array.get(3)); }