.用java统计全班学生成绩。输入学生的学号及语文、数学、英语成绩，输出学生各科成绩信息、平均成绩和总成绩。（二维数组及循环） 请输入本班学生总数:2学生成绩结果如下: ———————————————

是用Java统计全班学生成绩的代码，其中使用了二维数组和循环来实现输入、计算和输出学生成绩信息、平均成绩和总成绩。

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("请输入本班学生总数:");
        int n = input.nextInt();
        String[] subjects = {"语文", "数学", "英语"};
        int[][] scores = new int[n][3];
        int[] sum = new int[n];
        double[] avg = new double[n];
        for (int i = 0; i < n; i++) {
            System.out.print("请输入第" + (i + 1) + "个学生的学号:");
            String id = input.next();
            System.out.println("请输入第" + (i + 1) + "个学生的成绩:");
            for (int j = 0; j < 3; j++) {
                System.out.print(subjects[j] + ":");
                scores[i][j] = input.nextInt();
                sum[i] += scores[i][j];
            }
            avg[i] = sum[i] / 3.0;
        }
        System.out.println("学号\t语文\t数学\t英语\t总分\t平均分");
        for (int i = 0; i < n; i++) {
            System.out.print((i + 1) + "\t");
            for (int j = 0; j < 3; j++) {
                System.out.print(scores[i][j] + "\t");
            }
            System.out.print(sum[i] + "\t");
            System.out.printf("%.2f", avg[i]);
            System.out.println();
        }
        System.out.println("全班每门课程的平均分:");
        for (int j = 0; j < 3; j++) {
            int sumSubject = 0;
            for (int i = 0; i < n; i++) {
                sumSubject += scores[i][j];
            }
            double avgSubject = sumSubject / (double) n;
            System.out.print(subjects[j] + ":" + avgSubject + "\t");
            int[] count = new int[5];
            for (int i = 0; i < n; i++) {
                if (scores[i][j] < 60) {
                    count[0]++;
                } else if (scores[i][j] < 70) {
                    count[1]++;
                } else if (scores[i][j] < 80) {
                    count[2]++;
                } else if (scores[i][j] < 90) {
                    count[3]++;
                } else {
                    count[4]++;
                }
            }
            System.out.println("不及格:" + count[0] + " 60-69:" + count[1] + " 70-79:" + count[2] + " 80-89:" + count[3] + " 90-100:" + count[4]);
        }
        System.out.println("不及格学生信息:");
        for (int i = 0; i < n; i++) {
            boolean isFail = false;
            for (int j = 0; j < 3; j++) {
                if (scores[i][j] < 60) {
                    isFail = true;
                    break;
                }
            }
            if (isFail) {
                System.out.print((i + 1) + "\t");
                for (int j = 0; j < 3; j++) {
                    System.out.print(scores[i][j] + "\t");
                }
                System.out.print(sum[i] + "\t");
                System.out.printf("%.2f", avg[i]);
                System.out.println();
            }
        }
        System.out.println("优等生信息:");
        for (int i = 0; i < n; i++) {
            boolean isExcellent = true;
            for (int j = 0; j < 3; j++) {
                if (scores[i][j] < 90) {
                    isExcellent = false;
                    break;
                }
            }
            if (isExcellent) {
                System.out.print((i + 1) + "\t");
                for (int j = 0; j < 3; j++) {
                    System.out.print(scores[i][j] + "\t");
                }
                System.out.print(sum[i] + "\t");
                System.out.printf("%.2f", avg[i]);
                System.out.println();
            }
        }
    }
}