It disappeared my topic

Question

hi everyone!
could you please help me with this exercise?
i have one error message, but i can't solve it.
- create a project named Student. Add fields to the Student class for an ID number, number of
credit hours earned, and number of points earned. include methods to assign values to all fields.
The Student class also has a field for grade point average. include a method to compute the grade
point average field by dividing points by credit hours earned.write methods to display the values
in each Student field.
here goes my coding:
public class Student
     int idNo = 111;
     double hrs = 0;
     double noOfPoints = 0;
     double grPoAve = 0;
     public void setNoOfPoints(double nrPoints)
          noOfPoints = nrPoints;
     public double getNoOfPoints()
          return noOfPoints;
     public void sethrs(double hours)
          hrs = hours;
     public double gethrs()
          return hrs;
     public double calcAverage(double points, double hours)
          double grPoAve = points/hours;
          return grPoAve;
     public void setcalcAverage(double gpa)
          grPoAve = gpa;
     public double getcalcAverage()
          return grPoAve;
     public void setidno(int idNumber)
          idNo = idNumber;
     public int getidno()
          return idNo;
     public static void main (String[] args)
          Student stnew = new Student();
          stnew.setNoOfPoints(555);
          stnew.sethrs(2);
          double grPoAve;
          grPoAve = calcAverage(stnew.getNoOfPoints(),stnew.gethrs());
          System.out.println("The student with number: " + stnew.getidno());
          System.out.println(" has " + stnew.gethrs() + "hours");
          System.out.println(" has accumulated " + stnew.getcalcAverage());
          System.out.println(" grade point average ");
- if i use the above code i am getting this error:
cannot reference member 'double calcAverage(double points, double hours)' without an object.
the error message points to the fifth line in the main method.     
error message:
not enough arguments for method 'void Student.SetNoOfPoints(double nrPoints)'
- if i use the following :
grPoAve = calcAverage(stnew.setNoOfPoints,stnew.gethrs);
i am getting this error:
'stnew.setNoOfPoints' is not a field in class 'Student'
help me please.
thanks, Tuci

Answer 1

Try this:
molly% java Student
The student with number: 111
has 2.0hours
has accumulated 277.5
grade point average
molly% cat Student.java
public class Student {
    int idNo = 111;
    double hrs = 0;
    double noOfPoints = 0;
    double grPoAve = 0;
    public void setNoOfPoints(double nrPoints) {
        noOfPoints = nrPoints;
    public double getNoOfPoints() {
        return noOfPoints;
    public void sethrs(double hours) {
        hrs = hours;
    public double gethrs() {
        return hrs;
    public double calcAverage(double points, double hours) {
        double grPoAve = points/hours;
        return grPoAve;
    // added a set method
    public void setgrPoAve(double d) {
        grPoAve = d;
    public void setcalcAverage(double gpa) {
        grPoAve = gpa;
    public double getcalcAverage() {
        return grPoAve;
    public void setidno(int idNumber) {
        idNo = idNumber;
    public int getidno() {
        return idNo;
    public static void main (String[] args) {
        Student stnew = new Student();
        stnew.setNoOfPoints(555);
        stnew.sethrs(2);
        //use the set and gets
stnew.setgrPoAve(stnew.calcAverage(stnew.getNoOfPoints(),stnew.gethrs()));
        System.out.println("The student with number: " + stnew.getidno());
        System.out.println(" has " + stnew.gethrs() + "hours");
        System.out.println(" has accumulated " + stnew.getcalcAverage());
        System.out.println(" grade point average ");