$10\mathrm{.}11\mathrm{.}1$: Compute the value of an arithmetic expression with exception handling.

$597714\mathrm{.}2988516.$qx$3$zqy$7$

Write a method that computes the value of an arithmetic expression. The operator string should be one of $("+","-","*",$ or $"/").$ The method should throw an IllegalArgumentException otherwise. Also throw an IllegalArgumentException if the operator is $"/"$ and the second argument is zero.