Create a java class file named SwitchDemo.java. This class should satisfy the following requirements: a. Declare and initialize a character variable with a letter grade.

b. Has nested ifelse statements that performs the following checks: i. If the letter grade is A, a message stating Great work is displayed ii. If the letter grade is B, a message stating Good work is displayed iii. If the letter grade is C, a message stating Average work is displayed iv. If the letter grade is D, a message stating Below average work is displayed v. If the letter grade is F, a message stating Unsatisfactory work is displayed vi. If the letter is anything other than the above values, a message stating that the letter was invalid should be displayed

c. Once the nested ifelse is completed, replicate the functionality using a switch statement instead