@Override
public E peek() throws Exception {
// TODO Auto-generated method stub
if (list.size() > 0) {
return list.getFirst();
}
return null;
}
@Override
public void empty() {
// TODO Auto-generated method stub
while (list.getFirst() != null) list.removeFirst();
}
@Override
public E pop() throws Exception {
// TODO Auto-generated method stub
return list.removeFirst();
}
@Override
public int size() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public void push(E x) {
// TODO Auto-generated method stub
list.addFirst(x);
}