### Question:
ArrayDeque { public boolean isEmpty() { return size == 0; } 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 IsEmptyTest1() { System.out.println("Perform IsEmptyTest1"); ArrayDeque<Integer> array = new ArrayDeque<>(); assertEquals(array.isEmpty(), true); }