java从键盘输入学生成绩，找出最高分，并输出学生成绩等级。

/*从键盘输入学生成绩，找出最高分，并输出学生成绩等级；
成绩 >=最高分-10 等级为A
成绩 >=最高分-20 等级为B
成绩 >=最高分-30 等级为C
其余为 等级为D

提示：先输入学生人数，根据人数创建int数组，存放学生成绩；
*/

package study01;

import java.util.Scanner;

public class Score {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("请输入学生人数:");
        int length = sc.nextInt();

        int[] scores = new int[length];
        int maxScore = 0;
        for (int i = 0; i < scores.length; i++) {
            scores[i] = sc.nextInt();
            if (scores[i] > maxScore) {
                maxScore = scores[i];
            }

        }
        System.out.println("最高分" + maxScore);

        System.out.println("输入的成绩为:");
        for (int i = 0; i < scores.length; i++) {
            char level;
            if (scores[i] > maxScore - 10) {
                level = 'A';
            } else if (scores[i] > maxScore - 20) {
                level = 'B';
            } else if (scores[i] > maxScore - 30) {
                level = 'C';
            } else {
                level = 'D';
            }

            System.out.println("student["+i+"] score is "+scores[i]+" grade is "+level);
        }

    }
}

输出结果如下：

请输入学生人数:6
90
70
80
50
60
40
最高分90
输入的成绩为:
student[0] score is 90 grade is A
student[1] score is 70 grade is C
student[2] score is 80 grade is B
student[3] score is 50 grade is D
student[4] score is 60 grade is D
student[5] score is 40 grade is D