### Question:
Stack implements Iterable<E> { @SuppressWarnings("rawtypes") @Override public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof Stack)) { return false; } Stack stack = (Stack) obj; return list.equals(stack.list); } Stack();  Stack(int initialCapacity);  Stack(Stack<E> stack); boolean isEmpty(); E peek(); E pop(); E push(E item); int search(E o); int size(); E get(int depth); void add(E item); void clear(); @Override Iterator<E> iterator(); Stream<E> stream(); @Override int hashCode(); @SuppressWarnings("rawtypes") @Override boolean equals(Object obj); @Override String toString();  }### Answer:
@Test public void testEquals() { assertEquals(stack1, stack1); assertEquals(false, stack1.equals(stack2)); assertEquals(true, stack2.equals(stack4)); }