When a Comparator isn't available, the natural ordering of the elements is used to determine priority. If the elements don't implement the Comparable interface, then that is a run-timeerror.
在不能使用Comparator时，可以使用元素的自然顺序来确定优先级。
2
When a run-timeerror occurs, you have several ways of dealing with it.
当一个运行时发生错误，您有几种方法来处理它。
3
The paper summarizes the logical error and run-timeerror that the compiler can not find, in order to help beginners better to master debugging skill and improve programming ability.