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Update java-collection-questions-02.md

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注释，由 “如果链表元素个数大于等于TREEIFY_THRESHOLD（8）” 改为“如果链表元素个数大于TREEIFY_THRESHOLD（8）”。
个人认为，等于8时，并没有考虑转红黑树。
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@ -239,7 +239,7 @@ for (int binCount = 0; ; ++binCount) {
// 遍历到链表最后一个节点 // 遍历到链表最后一个节点
if ((e = p.next) == null) { if ((e = p.next) == null) {
p.next = newNode(hash, key, value, null); p.next = newNode(hash, key, value, null);
// 如果链表元素个数大于等于TREEIFY_THRESHOLD（8） // 如果链表元素个数大于TREEIFY_THRESHOLD（8）
if (binCount >= TREEIFY_THRESHOLD - 1) // -1 for 1st if (binCount >= TREEIFY_THRESHOLD - 1) // -1 for 1st
// 红黑树转换（并不会直接转换成红黑树） // 红黑树转换（并不会直接转换成红黑树）
treeifyBin(tab, hash); treeifyBin(tab, hash);