设计一个高并发的Java秒杀系统需要考虑以下几个方面: 数据库优化:使用高性能的数据库,如Redis或者Memcached,将秒杀商品的库存信息等数据存储在内存中,以提高读写性能。缓存技术:使用缓存技术来减轻数据库的压力
I display elements in a hierarchy, clicking one displays the next set of elements in the hirearchy. Each element has a tag called \"level\" which has some value which is 1-.... (whatever the number of