//此處遍歷鏈表
                for (int binCount = 0; ; ++binCount) {
                    //遍歷到鏈表最后一個節(jié)點
                    if ((e = p.next) == null) {
                        p.next = newNode(hash, key, value, null);
                        //如果鏈表元素個數(shù)大于等于TREEIFY_THRESHOLD
                        if (binCount >= TREEIFY_THRESHOLD - 1) // -1 for 1st
                            //紅黑樹轉(zhuǎn)換邏輯
                            treeifyBin(tab, hash);
                        break;
                    }
                    if (e.hash == hash &&
                        ((k = e.key) == key || (key != null && key.equals(k))))
                        break;
                    p = e;
                }

    
    static final int MIN_TREEIFY_CAPACITY = 64;
    static final int UNTREEIFY_THRESHOLD = 6;
    /**
     * Replaces all linked nodes in bin at index for given hash unless
     * table is too small, in which case resizes instead.
     */
    final void treeifyBin(Node<K,V>[] tab, int hash) {
        int n, index; Node<K,V> e;
        if (tab == null || (n = tab.length) < MIN_TREEIFY_CAPACITY)
            resize();
        else if ((e = tab[index = (n - 1) & hash]) != null) {
            TreeNode<K,V> hd = null, tl = null;
            do {
                TreeNode<K,V> p = replacementTreeNode(e, null);
                if (tl == null)
                    hd = p;
                else {
                    p.prev = tl;
                    tl.next = p;
                }
                tl = p;
            } while ((e = e.next) != null);
            if ((tab[index] = hd) != null)
                hd.treeify(tab);
        }
    }

 //判斷是否要解除紅黑樹的條件
if (root == null || root.right == null ||
                (rl = root.left) == null || rl.left == null) {
                tab[index] = first.untreeify(map);  // too small
                return;
   }

//在這之前的邏輯是將紅黑樹每個節(jié)點的hash和一個bit進(jìn)行&運算，
//根據(jù)運算結(jié)果將樹劃分為兩棵紅黑樹，lc表示其中一棵樹的節(jié)點數(shù)
if (lc <= UNTREEIFY_THRESHOLD)
                    tab[index] = loHead.untreeify(map);
                else {
                    tab[index] = loHead;
                    if (hiHead != null) // (else is already treeified)
                        loHead.treeify(tab);
                }