问接受用户输入作为字符串，并将其转换为双精度值以放置在二维数组中

EN

Scanner scan = new Scanner(System.in);

String userInput = scan.nextLine();
String nameArray[] = new String[20];
double gradeArray[][] = new double[20][5];
double avgArray[] = new double[20];
double average;

// iterate through all 20 students
for (int i = 0; i < 21; i++)
{
    // ask for user input for grade
    System.out.println("Please enter 5 of the student's grade(s): ");
    average = 0;
    nameArray[i] = userInput;
    for (int j = 0; j < 5; j++)
    {
        gradeArray[i][j] = Double.parseDouble(userInput);
        average +=Double.parseDouble(userInput);
        System.out.println("/n");
    }
    avgArray[i] = average;
}