// Remove and return current element
public Object remove () {
if (curr == tail) return null; // Nothing to remove
Object it = curr.element(); // Remember value
curr.setelement(curr.next().element()); // Pull forward the next element
if (curr.next() == tail) tail = curr; // Removed last, move tail
curr.setnext(curr.next().next()); // Point around unneeded link
listSize--; // Decrement element count
return it; // Return value
}
// Append "it" to list
public void append(Object it) {
tail.setnext(new Link(null));
tail.setelement(it);
tail = tail.next();
listSize++;
}
// Insert "it" at current position
public void insert(Object it) {
curr.setnext(new Link(curr.element(), curr.next()));
curr.setelement(it);
if (tail == curr) tail = curr.next(); // New tail
listSize++;
}
