Java-链表LinkedList源码原理分析，并且通过LinkedList构建队列

public boolean add(E e) {
        linkLast(e);        return true;
    }

void linkLast(E e) {
        final Node<E> l = last;
        final Node<E> newNode = new Node<>(l, e, null);
        last = newNode;
        if (l == null)
            first = newNode;
        else
            l.next = newNode;
        size++;
        modCount++;
    }

public boolean offer(E e) {
        return add(e);
    }

public E poll() {
        final Node<E> f = first;
        return (f == null) ? null : unlinkFirst(f);
    }

public void addFirst(E e) {
        linkFirst(e);
    }

private void linkFirst(E e) {
        final Node<E> f = first;
        final Node<E> newNode = new Node<>(null, e, f);
        first = newNode;
        if (f == null)
            last = newNode;
        else
            f.prev = newNode;
        size++;
        modCount++;
    }

public E pop() {
        return removeFirst();
    }

public E removeFirst() {
        final Node<E> f = first;
        if (f == null)
            throw new NoSuchElementException();
        return unlinkFirst(f);
    }

private E unlinkFirst(Node<E> f) {
        // assert f == first && f != null;
        final E element = f.item;
        final Node<E> next = f.next;
        f.item = null;
        f.next = null; // help GC
        first = next;
        if (next == null)
            last = null;
        else
            next.prev = null;
        size--;
        modCount++;
        return element;
    }

list.forEach(item -> {
                    System.out.println("遍历元素：" + item);
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                });