Thread: Cannot Find Constructor

Hi, I'm trying to write a program right now that requires inheritance. I understand the concept and what I'm supposed to do, but I'm having trouble with the syntax. I created a class called student and created its methods and attributes, and then I created a constructor called student. Next I need to create subclasses called Graduate, Undergraduate, and part-time and create additional methods for them. I keep getting an error saying "Cannot find constructor Student" and I can't figure out why. Here's my code. Line 75 is the issue line. Thanks.

public abstract class Student {
 
    private String firstName;
    private String lastName;
    private int studentID;
    private double gPA;
    private String status;
    private String mentor;
 
    public String getFirstName() {
        return firstName;
    }
 
    public String getLastName() {
        return lastName;
    }
 
    public int getStudentID() {
        return studentID;
    }
 
    public double getGPA() {
        return gPA;
    }
 
    public String getStatus() {
        return status;
    }
 
    public String getMentor() {
        return mentor;
    }
 
    public void setFirstName(String fName){
        firstName = fName;
    }
 
    public void setLastName(String lName) {
        lastName = lName;
    }
 
    public void setStudentID(int sID) {
        studentID = sID;
    }
 
    public void setGPA(double sGPA) {
        gPA = sGPA;
    }
 
    public void setStatus(String sStatus) {
        status = sStatus;
    }
 
    public void setMentor(String sMentor) {
        mentor = sMentor;
    }
 
    public Student(String fName, String lName, int sID, double sGPA, String sStatus, String sMentor) {
 
        firstName = fName;
        lastName = lName;
        studentID = sID;
        gPA = sGPA;
        status = sStatus;
        mentor = sMentor;
 
    }
 
    public abstract void calculateTuition();
    public abstract void update();
    public abstract void add();
    public abstract void delete();
    public abstract void query ();
 
public class Graduate extends Student {
 
}
}

First off all, you don't have

public Student()
{

}

Also, I might add, that abstract classes cannot be initialized, at least not to themselves.

You cannot have

Student stu = new Student();

if you had a subclass of Student called MathStudent, you could

Student stu = new MathStudent();

I fear you may need a default constructor

public Student()
{

}

too if you're extending Student.

public abstract class Student {
 
    private String firstName;
    private String lastName;
    private int studentID;
    private double gPA;
    private String status;
    private String mentor;
// default constructor needed for inheritance
public Student()
{
 
}
    public String getFirstName() {
        return firstName;
    }
 
    public String getLastName() {
        return lastName;
    }
 
    public int getStudentID() {
        return studentID;
    }
 
    public double getGPA() {
        return gPA;
    }
 
    public String getStatus() {
        return status;
    }
 
    public String getMentor() {
        return mentor;
    }
 
    public void setFirstName(String fName){
        firstName = fName;
    }
 
    public void setLastName(String lName) {
        lastName = lName;
    }
 
    public void setStudentID(int sID) {
        studentID = sID;
    }
 
    public void setGPA(double sGPA) {
        gPA = sGPA;
    }
 
    public void setStatus(String sStatus) {
        status = sStatus;
    }
 
    public void setMentor(String sMentor) {
        mentor = sMentor;
    }
 
    public Student(String fName, String lName, int sID, double sGPA, String sStatus, String sMentor) {
 
        firstName = fName;
        lastName = lName;
        studentID = sID;
        gPA = sGPA;
        status = sStatus;
        mentor = sMentor;
 
    }
 
    public abstract void calculateTuition();
    public abstract void update();
    public abstract void add();
    public abstract void delete();
    public abstract void query ();
}

public class Graduate extends Student {
 
// if graduate has similar characteristics of Student, then you should
 
public Graduate (String fName, String lName, int sID, double sGPA, String sStatus, String sMentor, otherVariables)
{
super (fName, IName, sID, sGPA, sStatus, sMentor); // calls constructor of superclass
otherVariables = this.otherVariables;
 
}
 public  void calculateTuition()
{
 
}
    public  void update()
{
 
}
    public  void add()
{
 
}
    public  void delete()
{
 
}
    public  void query ()
{
 
}
 
// other methods, and also a default constructor if you're planning on extending Graduate
// also, you don't need to have any methods defined here that were already written in Student, unless you're changing
// what they do or their parameters.  
// Every method that was abstract in Student MUST be defined, or at least written like I did, in Graduate, otherwise,
// Graduate will have to be an abstract class too.
}

Ok, now it makes sense to me. Thank you very much!