The range checking comes at the price of having a small amount of memory overhead on each array as well as verifying the index at run-time,but the assumption is that the safety and increased productivity is worth the expense.

• 由于系统自动进行范围检查，所以必然要付出一些代价：针对每个数组，以及在运行期间对索引的校验，都会造成少量的内存开销。但由此换回的是更高的安全性，以及更高的工作效率。为此付出少许代价是值得的。