Full disclosure, this is homework, but only a very small part of an assignment that I can't figure out why it's not working. Here is the assignment text:
Create a CollegeStudent class. This class will contain data fields that hold a student's first name, last name, enrollment date, and projected graduation date, using the GregorianCalendar class for each date. Provide get() and set() methods for each field. Also provide a constructor that requires first and last names and enrollment date, and sets the project graduation date to exactly four years after enrolment. Save the class as CollegeStudent.java.
Create an interactive application that prompts the user for data for two CollegeStudent objects. Prompt the user for first name, last name, enrollment month, enrollment day, and enrollment year for each CollegeStudent, and then instantiate the objects. Display all the values, including the projected graduation dates. Save the application as TestCollegeStudent.java
I've been able to do everything it asks, except when I try to calculate the graduation date, it adds 4 years to the enrollment date value as well. Here is my CollegeStudent class:
import java.util.GregorianCalendar;
public class CollegeStudent {
String firstName;
String lastName;
GregorianCalendar enrollmentDate;
GregorianCalendar graduationDate;
// Constructor requiring first name, last name, and enrollment date
public CollegeStudent(String first, String last, GregorianCalendar enrollment) {
firstName = first;
lastName = last;
enrollmentDate = enrollment;
// Set graduationDate to enrollmentDate, then add 4 years
graduationDate = enrollment;
graduationDate.add(GregorianCalendar.YEAR, 4);
}
// Get and Set firstName
public void setFirstName(String first) {
firstName = first;
}
public String getFirstName() {
return firstName;
}
// Get and Set lastName
public void setLastName(String last) {
lastName = last;
}
public String getLastName() {
return lastName;
}
// Get and Set enrollmentDate
public void setEnrollmentDate(GregorianCalendar enrollment) {
enrollmentDate = enrollment;
}
public GregorianCalendar getEnrollmentDate(){
return enrollmentDate;
}
// Get and Set graduationDate
public void setGraduationDate(GregorianCalendar graduation) {
graduationDate = graduation;
}
public GregorianCalendar getGraduationDate() {
return graduationDate;
}
}
My TestCollegeStudent.java displays both the enrollmentDate and graduationDate and they both show the same date 4 years after the initial enrollmentDate entered by the user. If I remove the line where I added 4 years to the graduationDate, they both display as the initial enrollmentDate. I feel like I'm missing some very simple syntax issue, but I haven't been able to figure out what it is.
