private void setHead(Node newHead) {
if (newHead == null) {
head = null;
} else {
Node oldHead = (Node) pj.find(head);
pj.update(oldHead, newHead);
}
}
private Node getHead() {
if (head == null) {
return null;
} else {
return (Node) pj.find(head);
}
}
@Override
public boolean isEmpty() {
int size = pj.size();
if (size == 0) {
return true;
} else {
return false;
}
}
@Override
public boolean add(T e) {
if (pj.contains(e)) {
return false;
}
Node newNode = new Node(e);
newNode.setItem(e);
if (getHead() == null) {
setHead(newNode);
} else {
Node last = getLastNode();
last.setNext(newNode);
}
return true;
}
@Override
public boolean contains(Object o) {
return pj.contains(o);
}
