Method remove

java/18_hashtable/HashTable.java:137–156

删除 @param key

(K key)

     * @param key
     */
    public void remove(K key) {
        int index = hash(key);
        Entry e = table[index];
        if (e == null || e.next == null) {
            return;
        }

        Entry pre;
        Entry<K, V> headNode = table[index];
        do {
            pre = e;
            e = e.next;
            if (key == e.key) {
                pre.next = e.next;
                size--;
                if (headNode.next == null) use--;
                return;
            }
        } while (e.next != null);
    }

    /**
     * 获取