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';
  }
}