public class Main {    public static void main(String[] args) {// 用二维数组表示的学生成绩:        int[][] scores = {                { 82, 90, 91 },                { 68, 72, 64 },                { 95, 91, 89 },                { 67, 52, 60 },                { 79, 81, 85 },                };                // TODO:                double average = 0;                double sum = 0;                int n = 0;                for (int i = 0;i <scores.length;i++){                    for (int j = 0 ;j <scores[0].length;j++){                        sum +=scores[i][j];                        n +=1;                    }                }                average =sum/n;                System.out.println(average);        if (Math.abs(average - 77.733333) < 0.000001) {            System.out.println("测试成功");        } else {            System.out.println("测试失败");        }    }}