@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof Node)) return false;
Node<?> node = (Node<?>) o;
if (getId() != node.getId()) return false;
return !(getData() != null ? !getData().equals(node.getData()) : node.getData() != null);
}
public Node(Node otherNode) {
this.id = otherNode.getId();
this.data = (T) otherNode.getData();
}