I need to write a Java program and need help. These are the parameters:

Create a CourseException class that extends Exception and whose constructor receives a String that holds a college course$$s department $($for example, CIS$),$ a course number $($for example, $101),$ and a number of credits $($for example, $3).$ Save the file as CourseException.java. Create a Course class with the same fields and whose constructor requires values for each field. Upon construction, throw a CourseException if the department does not consist of three letters, if the course number does not consist of three digits between $100$ and $499$ inclusive, or if the credits are less than $0\mathrm{.}5$ or more than $6.$ Save the class as Course.java. Write an application that establishes an array of at least six Course objects with valid and invalid values. Display an appropriate message when a Course object is created successfully and when one is not. Save the file as ThrowCourseException.java.