[例3 预先分配容器大小：以List为例](%E4%BE%8B3%20%E9%A2%84%E5%85%88%E5%88%86%E9%85%8D%E5%AE%B9%E5%99%A8%E5%A4%A7%E5%B0%8F%EF%BC%9A%E4%BB%A5List%E4%B8%BA%E4%BE%8B.md) [例4 预先缓存数据：int转String的例子](%E4%BE%8B4%20%E9%A2%84%E5%85%88%E7%BC%93%E5%AD%98%E6%95%B0%E6%8D%AE%EF%BC%9Aint%E8%BD%ACString%E7%9A%84%E4%BE%8B%E5%AD%90.md)