java数组练习，有 5 个学生，每个学生的数据包括学号、班级、姓名、三门课成绩。

Question

有 5 个学生，每个学生的数据包括学号、班级、姓名、三门课成绩。从键盘输入5 个学生数据，要求打印出每个学生三门课的平均成绩，以及平均分最高分学生的所有数据。

Answer 1

import java.util.Scanner;

public class CalculateScore {
    public static void main(String[] args) {
        System.out.println("请依次输入5个学生的数据：学号、班级、姓名、三门课成绩（以空格隔开）");
        Scanner scanner = new Scanner(System.in);
        // 5行7列，最后一列用来存平均成绩
        Object[][] array = new Object[5][7];
        int enterCount = 0;
        while (enterCount < 5) {
            String line = scanner.nextLine();
            String[] strings = line.split(" ");

            array[enterCount][0] = strings[0];
            array[enterCount][1] = strings[1];
            array[enterCount][2] = strings[2];

            double score1 = Double.parseDouble(strings[3]);
            array[enterCount][3] = score1;

            double score2 = Double.parseDouble(strings[4]);
            array[enterCount][4] = score2;

            double score3 = Double.parseDouble(strings[5]);
            array[enterCount][5] = score3;

            double avgScore = (score1 + score2 + score3) / 3;
            array[enterCount][6] = avgScore;
            enterCount++;
        }

        double maxAvgScore = (double) array[0][6];
        int maxAvgScoreStuIndex = 0;
        for (int index = 0; index < array.length; index++) {
            double score = (double) array[index][6];
            if (score > maxAvgScore) {
                maxAvgScore = score;
                maxAvgScoreStuIndex = index;
            }
        }

        String format = "%.2f"; // 保留两位小数
        System.out.println("所有学生的平均成绩如下：");
        for (int index = 0; index < array.length; index++) {
            System.out.println(
                    array[index][2] + ": " + String.format(format, (double) array[index][6]));
        }

        System.out.println("平均分最高分学生数据如下：");
        StringBuilder str = new StringBuilder();
        for (int index = 0; index < array[maxAvgScoreStuIndex].length; index++) {
            if (index == array[maxAvgScoreStuIndex].length - 1) {
                str.append(String.format(format, (double) array[maxAvgScoreStuIndex][index]));
            } else {
                str.append(array[maxAvgScoreStuIndex][index]);
            }
            str.append(" ");
        }
        System.out.println(str.toString());
    }
}