Question

Java Beginner

a)Create a class named Student that has fields for an ID number, number of credit hours earned, and number of points earned. (For example, many schools compute grade point averages based on a scale of 4, so a three-credit-hour class in which a student earns an A is worth 12 points.) Include methods to assign values to all fields. A Student 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. Save this class as Student.java.

b)Write a class named ShowStudent that instantiates a Student object from the class you created and assign values to its fields. Compute the Student grade point average, and then display all the values associated with the Student. Save the application as ShowStudent.java.

c)Create a constructor for the Student class you created. The constructor should initialize each Student’s ID number to 9999, his or her points earned to 12, and credit hours to 3 (resulting in a grade point average of 4.0).Write a program that demonstrates that the constructor works by instantiating an object and displaying the initial values. Save the application as ShowStudent2.java.

Answer 1

class Student{
   private String ID;
   private int numberOfCredits;
   private int points;
   private double gradePoint;
   public Student(){}
   public Student(String aID, int aNumberOfCredits, int aPoints) {
       super();
       ID = aID;
       numberOfCredits = aNumberOfCredits;
       points = aPoints;
       calculateGradePoint();
   }
   public String getID() {
       return ID;
   }
   public void setID(String aID) {
       ID = aID;
   }
   public int getNumberOfCredits() {
       return numberOfCredits;
   }
   public void setNumberOfCredits(int aNumberOfCredits) {
       numberOfCredits = aNumberOfCredits;
   }
   public int getPoints() {
       return points;
   }
   public void setPoints(int aPoints) {
       points = aPoints;
   }
   @Override
   public String toString() {
       return "ID : " + ID + " NumberOfCredits : " + numberOfCredits + " Points : " + points+" Grade Point : "+gradePoint;
   }
   public void calculateGradePoint(){
       gradePoint=points/(double)numberOfCredits;
   }
}
public class ShowStudent {
public static void main(String[] args) {
   Student s = new Student();
   s.setID("9999");
   s.setNumberOfCredits(3);
   s.setPoints(12);
   s.calculateGradePoint();
   System.out.println(s);
}
}

class Student{
   private String ID;
   private int numberOfCredits;
   private int points;
   private double gradePoint;
   public Student(){}
   public Student(String aID, int aNumberOfCredits, int aPoints) {
       super();
       ID = aID;
       numberOfCredits = aNumberOfCredits;
       points = aPoints;
       calculateGradePoint();
   }
   public String getID() {
       return ID;
   }
   public void setID(String aID) {
       ID = aID;
   }
   public int getNumberOfCredits() {
       return numberOfCredits;
   }
   public void setNumberOfCredits(int aNumberOfCredits) {
       numberOfCredits = aNumberOfCredits;
   }
   public int getPoints() {
       return points;
   }
   public void setPoints(int aPoints) {
       points = aPoints;
   }
   @Override
   public String toString() {
       return "ID : " + ID + " NumberOfCredits : " + numberOfCredits + " Points : " + points+" Grade Point : "+gradePoint;
   }
   public void calculateGradePoint(){
       gradePoint=points/(double)numberOfCredits;
   }
}
public class ShowStudent2 {
public static void main(String[] args) {
   Student s = new Student("9999",3,12);
   System.out.println(s);
}
}

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