EnterTestScores.java

import java.util.Scanner;

class EnterTestScores {
    public static void main (String[] args){
        Scanner scanner = new Scanner (System.in);
        String reply;
        int n = 0;
        double score;
        Student[] students = new Student[50];
        for (int i=0; i<50; i++){
            students[i] = new Student();
        }
        do {
            System.out.print("Enter student’s name: ");
            students[n].enterName(scanner.next());
            scanner.nextLine(); //Refer to part (c)
            System.out.print("Enter student’s score: ");
            students[n].enterScore(students[n].getName(),
                    scanner.nextDouble());
            scanner.nextLine(); //Refer to part (d)
            n++;
            System.out.print("Any more student (y or n)?");
            reply = scanner.next();
        } while (reply.charAt(0) == 'y');
        for (int i=0;i<n;i++){
            System.out.println(students[i].getName()+ " – " + students[i].getScore());
        }
        System.out.println("Average score in this class : " + Student.averageScoreInClass());
        System.out.println("Top student in this class: " +   Student.topStudentInClass() + " - " +   Student.topScoreInClass());
    }
}

public class Student {
        private static int totalStudentNumber = 0;
        private static  double totalScore = 0;
        private static double topScore = 0;
        private static String topStudent;
        private String  name;
        private double score = 0;

    public Student() {
    }

    public static int getTotalStudentNumber() {
        return totalStudentNumber;
    }

    public static void setTotalStudentNumber(int totalStudentNumber) {
        Student.totalStudentNumber = totalStudentNumber;
    }

    public static double getTotalScore() {
        return totalScore;
    }

    public static void setTotalScore(double totalScore) {
        Student.totalScore = totalScore;
    }

    public static double getTopScore() {
        return topScore;
    }

    public static void setTopScore(double topScore) {
        Student.topScore = topScore;
    }

    public static String getTopStudent() {
        return topStudent;
    }

    public static void setTopStudent(String topStudent) {
        Student.topStudent = topStudent;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getScore() {
        return score;
    }

    public void setScore(double score) {
        this.score = score;
    }

    public void enterName(String name) {
        this.name = name;
    }

    public void enterScore(String name, double score) {
        this.name = name;
        this.score = score;
        this.totalScore += score;
        this.totalStudentNumber++;
        if (score > topScore) {
            topScore = score;
            topStudent = name;
        }
    }

    public static double averageScoreInClass() {
        return totalScore / totalStudentNumber;
    }

    public static String topStudentInClass() {
        return topStudent;
    }

    public static double topScoreInClass() {
        return topScore;
    }
}