base/common/src/main/com/thesett/common/util/FifoStack.java
public E pop()
    {
        E ob;

        if (size() == 0)
        {
            return null;
        }

        ob = get(0);
        remove(0);

        return ob;
    }
public E pop()
    {
        E ob;

        if (size() == 0)
        {
            return null;
        }

        ob = get(0);
        remove(0);

        return ob;
    }
Pops the first object placed on the stack off of it and returns it.

@return The first object placed on the stack.