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Merge pull request #2415 from CoisiniAKAM/main

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Update linkedlist-source-code.md
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docs/java/collection/linkedlist-source-code.md
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@ -151,8 +151,9 @@ void linkBefore(E e, Node<E> succ) {
final Node<E> newNode = new Node<>(pred, e, succ); final Node<E> newNode = new Node<>(pred, e, succ);
// 将 succ 节点前驱引用 prev 指向新节点 // 将 succ 节点前驱引用 prev 指向新节点
succ.prev = newNode; succ.prev = newNode;
// 判断尾节点是否为空，为空表示当前链表还没有节点 // 判断前驱节点是否为空，为空表示 succ 是第一个节点
if (pred == null) if (pred == null)
// 新节点成为第一个节点
first = newNode; first = newNode;
else else
// succ 节点前驱的后继引用指向新节点 // succ 节点前驱的后继引用指向新节点