编写Java程序，接收用户输入的3个学生4门课成绩，分别计算每个学生的总成绩及平均分。

运行效果如下

img

示例代码如下：

public class Test {

    public static void main(String[] args) {
        List<List<Double>> students = new ArrayList<>();
        Scanner scanner = new Scanner(System.in);

        for (int i = 0; i < 3; i++) {
            List<Double> scores = new ArrayList<>();
            students.add(scores);
            for (int j = 0; j < 4; j++) {
                System.out.printf("请输入第%s位学生的第%s门课程的成绩：", (i + 1), (j + 1));
                scores.add(scanner.nextDouble());
            }
        }

        for (int i = 0; i < students.size(); i++) {
            System.out.printf("第%s位学生的课程成绩：", i + 1);
            double total = 0;

            for (int j = 0; j < students.get(i).size(); j++) {
                Double score = students.get(i).get(j);
                total += score;
                System.out.print(score + "\t");
            }
            double avg = total / students.get(i).size();
            System.out.print("总成绩：" + total + "\t");
            System.out.print("平均值为：" + avg + "\t\n");
        }
    }

}

运行效果如下：

img