Stack stack = new ArrayStack();
for (int i = 0; i<4; i++) stack.push(new Integer(i));
assert stack.toString().equals("stack[0, 1, 2, 3]");
int top = ((Integer)stack.pop()).intValue();
assert top==3 && stack.toString().equals("stack[0, 1, 2]");
Stack reverse = Stacks.reverse(stack);
assert stack.empty();
assert reverse.toString().equals("stack[2, 1, 0]");
