Figurative Code for Push/Pop
ls.push(Object
x):
s.head = new Cell(x, s.head);
s.head = new Cell(x, s.head);
ls.pop():
Object top = s.head.value;
s.head = s.head.next;
return top;
Object top = s.head.value;
s.head = s.head.next;
return top;
s.head
s.head.value
s.head.next
Java notation for the head value of stack s.