public LinkNode remove(int id) {
LinkNode needDelete = firstNode;
LinkNode previNode = firstNode;
while (needDelete.getId() != id) {
if (needDelete.getNext() == null) {
return null;
} else {
previNode = needDelete;
needDelete = needDelete.getNext();
}
}
if (needDelete.equals(firstNode)) {
firstNode = firstNode.getNext();
} else {
previNode.setNext(needDelete.getNext());
}
return needDelete;
}
