Question

Write a class encapsulating the concept of a Student, assuming that the Student has the following attributes:

the name of the student, the average of the student, and the student’s GPA.

Include a default constructor, an overloaded constructor, the accessors and mutators, and methods toString()
and equals(). Also include a method returning the letter grade base on the following range for the average:

Average Range Letter Grade

90-100 A
85-89   B+
80-84 B
75-79 C+
70-74 C
65-69 D+
60-64 D
  0-59 F

You do not need to write a client program or write comments.

Answer 1

public class Student {
        private String name;
        private double average;
        private double gpa;

        public Student() {
        }

        public Student(String aName, double aAverage, double aGpa) {
                super();
                name = aName;
                average = aAverage;
                gpa = aGpa;
        }

        public String getName() {
                return name;
        }

        public double getAverage() {
                return average;
        }

        public double getGpa() {
                return gpa;
        }

        public void setName(String aName) {
                name = aName;
        }

        public void setAverage(double aAverage) {
                average = aAverage;
        }

        public void setGpa(double aGpa) {
                gpa = aGpa;
        }

        @Override
        public int hashCode() {
                final int prime = 31;
                int result = 1;
                long temp;
                temp = Double.doubleToLongBits(average);
                result = prime * result + (int) (temp ^ (temp >>> 32));
                temp = Double.doubleToLongBits(gpa);
                result = prime * result + (int) (temp ^ (temp >>> 32));
                result = prime * result + ((name == null) ? 0 : name.hashCode());
                return result;
        }

        @Override
        public boolean equals(Object obj) {
                if (this == obj)
                        return true;
                if (obj == null)
                        return false;
                if (getClass() != obj.getClass())
                        return false;
                Student other = (Student) obj;
                if (Double.doubleToLongBits(average) != Double.doubleToLongBits(other.average))
                        return false;
                if (Double.doubleToLongBits(gpa) != Double.doubleToLongBits(other.gpa))
                        return false;
                if (name == null) {
                        if (other.name != null)
                                return false;
                } else if (!name.equals(other.name))
                        return false;
                return true;
        }

        @Override
        public String toString() {
                return "Student [name=" + name + ", average=" + average + ", gpa=" + gpa + "]";
        }

        public String letterGrade() {
                if (average >= 90)
                        return "A";
                if (average >= 85)
                        return "B+";
                if (average > 80)
                        return "B";
                if (average >= 75)
                        return "C+";
                if (average > 70)
                        return "C";
                if (average >= 65)
                        return "D+";
                if (average > 60)
                        return "D";
                return "F";

        }
}

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