Method resize

java/18_hashtable/HashTable.java:110–130

扩容

()

     * 扩容
     */
    private void resize() {
        Entry<K, V>[] oldTable = table;
        table = (Entry<K, V>[]) new Entry[table.length * 2];
        use = 0;
        for (int i = 0; i < oldTable.length; i++) {
            if (oldTable[i] == null || oldTable[i].next == null) {
                continue;
            }
            Entry<K, V> e = oldTable[i];
            while (e.next != null) {
                e = e.next;
                int index = hash(e.key);
                if (table[index] == null) {
                    use++;
                    // 创建哨兵节点
                    table[index] = new Entry<>(null, null, null);
                }
                table[index].next = new Entry<>(e.key, e.value, table[index].next);
            }
        }
    }

    /**
     * 删除