public void removeElement(X element) {
int cont = 0;
for (X e : neighbors) {
if (e.equals(element) == true) {
this.neighbors.remove(cont);
return;
} else cont++;
}
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Pair<?, ?> pair = (Pair<?, ?>) o;
if (x != null ? !x.equals(pair.x) : pair.x != null) return false;
return !(y != null ? !y.equals(pair.y) : pair.y != null);
}