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添加// 注释
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@ -359,7 +359,7 @@ E unlink(Node<E> x) {
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//删除前驱指针
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if (prev == null) {
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first = next;如果删除的节点是头节点,令头节点指向该节点的后继节点
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first = next;//如果删除的节点是头节点,令头节点指向该节点的后继节点
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} else {
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prev.next = next;//将前驱节点的后继节点指向后继节点
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x.prev = null;
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