I need help writing this code it should have a main demostration class and use java dialog box for input and output

greater hours, minutes, and leftover seconds in that many seconds. 3. Test Scores Class Design a TestScores class that has fields to hold three test scores. (If you have already written the Test Scores class for Programming Challenge 8 of Chapter 3, you can modify it.) The class constructor should accept three test scores as arguments and assign these arguments to the test score fields. The class should also have accessor methods for the tes score fields, a method that returns the average of the test scores, and a method that return the letter grade that is assigned for the test score average. Use the grading scheme in the following table: Test Score Average Letter Grade 90-100 A 80-89 B 70-79 60-69 D Below 60 F Software Sales