I can not figure out how to modify this code.

PP 7.2 - Modify the Student class from the chapter 7 source files as follows. Each student object should also contain the scores for three tests. Provide a constructor that sets all instance values based on parameter values. Overload the constructor such that each test score is assumed to be initially zero. Provide a method called setTestScore that accepts two parameters: the test number (1 through 3) and the score. Also provide a method called getTestScore that accepts the test number and returns the appropriate score. Provide a method called average that computes and returns the average test score for this student. Modify the toString method such that the test scores and average are included in the description of the student. Modify the driver class main method of StudentBody to exercise the new Student methods.

Student Code:

public class Student { private String firstName, lastName; private Address homeAddress, schoolAddress; //----------------------------------------------------------------- // Constructor: Sets up this student with the specified values. //----------------------------------------------------------------- public Student(String first, String last, Address home, Address school) { firstName = first; lastName = last; homeAddress = home; schoolAddress = school; } //----------------------------------------------------------------- // Returns a string description of this Student object. //----------------------------------------------------------------- public String toString() { String result; result = firstName + " " + lastName + " "; result += "Home Address: " + homeAddress + " "; result += "School Address: " + schoolAddress; return result; } }

StudentBody Code:

public class StudentBody { //----------------------------------------------------------------- // Creates some Address and Student objects and prints them. //----------------------------------------------------------------- public static void main(String[] args) { Address school = new Address("800 Lancaster Ave.", "Villanova", "PA", 19085); Address jHome = new Address("21 Jump Street", "Blacksburg", "VA", 24551); Student john = new Student("John", "Smith", jHome, school); Address mHome = new Address("123 Main Street", "Euclid", "OH", 44132); Student marsha = new Student("Marsha", "Jones", mHome, school); System.out.println(john); System.out.println(); System.out.println(marsha); } }