Method offer

java/06_linkedlist/LRUBasedArray.java:40–54

模拟访问某个值 @param object

(T object)

     * @param object
     */
    public void offer(T object) {
        if (object == null) {
            throw new IllegalArgumentException("该缓存容器不支持null!");
        }
        Integer index = holder.get(object);
        if (index == null) {
            if (isFull()) {
                removeAndCache(object);
            } else {
                cache(object, count);
            }
        } else {
            update(index);
        }
    }

    /**
     * 若缓存中有指定的值，则更新位置