Use Constructors, getter setter, other methods for this please:

Let's say I have an ArrayList of elements:

{"Plane", "Car", "Jet", "Lion"}

and I want a method that can temporarily do this:

{"Hidden", "Car", "Jet", "Lion"}

Then afterwards, I want another method to return my ArrayList to this:

{"Plane", "Car", "Jet", "Lion"}

Any help will be appreciated!