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impl fix: cll remove - contains with only item caused exception

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Václav Přibík
2025-10-17 14:20:46 +02:00
parent 68d51a24ac
commit ceadbab59e
1 changed files with 13 additions and 6 deletions
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19
assignment/src/main/java/appointmentplanner/customlist/CustomLinkedListImpl.java
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@@ -33,6 +33,10 @@ public class CustomLinkedListImpl<T> implements CustomLinkedList<T> {
private CustomLinkedListNode<T> traverseFind(CustomLinkedListNode<T> currentNode, T item, ItemPosition position) { private CustomLinkedListNode<T> traverseFind(CustomLinkedListNode<T> currentNode, T item, ItemPosition position) {
if (currentNode == null) {
return null;
}
CustomLinkedListNode<T> nextNode = currentNode.getNext(); CustomLinkedListNode<T> nextNode = currentNode.getNext();
switch (position) { switch (position) {
@@ -83,26 +87,29 @@ public class CustomLinkedListImpl<T> implements CustomLinkedList<T> {
@Override @Override
public void remove(T item) { public void remove(T item) {
CustomLinkedListNode<T> nodeToRemove = traverseFind(head, item, ItemPosition.CURRENT); if (head == null) {
if (nodeToRemove == null) {
return; return;
} }
if (nodeToRemove == head) { if (head.getItem().equals(item)) {
head = head.getNext(); head = head.getNext();
return; return;
} }
CustomLinkedListNode<T> beforeNode = traverseFind(head, item, ItemPosition.BEFORE); CustomLinkedListNode<T> beforeNode = traverseFind(head, item, ItemPosition.BEFORE);
if (nodeToRemove.getNext() == null) { if (beforeNode == null) {
return;
}
CustomLinkedListNode<T> nodeToRemove = beforeNode.getNext();
if (beforeNode.getNext() == null) {
beforeNode.setNext(null); beforeNode.setNext(null);
return; return;
} }
beforeNode.setNext(nodeToRemove.getNext()); beforeNode.setNext(nodeToRemove.getNext());
} }
@Override @Override