Java/com/study/demo2/Student.java

package com.study.demo2;

public class Student {
    private String id;
    private String name;
    private int[] score = new int[10];

    public Student(String id, String name, int[] scores) {
        this.id = id;
        this.name = name;
        if (scores.length == 10) {
            this.score = scores;
        }
    }

    public double getAverage() {
        int sum = 0;
        for (int s : score) {
            sum += s;
        }
        return (double) Math.round((sum / 10.0) * 100) / 100;
    }

    public int getMaxScore() {
        int max = score[0];
        for (int s : score) {
            if (s > max) max = s;
        }
        return max;
    }

    public char getGrade() {
        double avg = getAverage();
        if (avg >= 90) return 'A';
        else if (avg >= 80) return 'B';
        else if (avg >= 70) return 'C';
        else if (avg >= 60) return 'D';
        else return 'E';
    }
}