从文本文件读取Java输入不匹配

Question

我正在编写一个程序，它将从充满学生成绩的文本文件中获取输入。 这些成绩取平均值并添加到数组列表中。 我在读取文件时遇到了麻烦。 我收到输入不匹配的信息。 我尝试将calcAssignmentAverage方法中的循环更改为小于15（有15个实验室等级，即文本文件中的第二行），但是它仍然提供输入不匹配的信息。

文件（实际文件有16个学生，使用以下格式。）：

Puckett, Karen
10 10 9.5 10 10 8 9.5 10 10 10 9 10 10 10 0
4 3 5 3 5 2 3 2 1.5 1 5 3.5
17.5 24 22 23.5 22 23
90 91
96

码：

 public static void main(String[] args) throws IOException {
    final double NUM_OF_LABS = 15;
    final double NUM_OF_QUIZZES = 12;
    final double NUM_OF_PROJECTS = 6;
    final double NUM_OF_EXAMS = 2;
    final double NUM_OF_FINAL = 1;
    final double LAB_POINTS = 150;
    final double QUIZ_POINTS = 60;
    final double PROJECT_POINTS = 150;
    final double EXAM_POINTS = 200;
    final double FINAL_POINTS = 100;

    //Open input file
    File myFile = new File("scores.txt");
    if (!myFile.exists()) {
        System.out.println("The input file was not found.");
        System.exit(0);
    }

    Scanner inputFile = new Scanner(myFile);

    ArrayList<Student> studentList = new ArrayList<Student>();

    readFile(inputFile, studentList, NUM_OF_LABS, LAB_POINTS, NUM_OF_QUIZZES,
            QUIZ_POINTS, NUM_OF_PROJECTS, PROJECT_POINTS, NUM_OF_EXAMS,
            EXAM_POINTS, NUM_OF_FINAL, FINAL_POINTS);

}

public static void readFile(Scanner inputFile,
        ArrayList<Student> studentList, double NUM_OF_LABS,
        double LAB_POINTS, double NUM_OF_QUIZZES, double QUIZ_POINTS,
        double NUM_OF_PROJECTS, double PROJECT_POINTS,
        double NUM_OF_EXAMS, double EXAM_POINTS, double NUM_OF_FINAL,
        double FINAL_POINTS) {

    //read and set data for student1:
    while (inputFile.hasNext()) {
        //create a new student
        Student currentStudent = new Student();

        //read name
        String name;
        name = inputFile.nextLine();
        currentStudent.setName(name);

        //read lab average 
        double labAverage = 0;
        labAverage = calcAssignmentAverage(NUM_OF_LABS, inputFile, LAB_POINTS);
        currentStudent.setLabAverage(labAverage);


        //add currentStudent to the list
        studentList.add(currentStudent);


    }
}

public static double calcAssignmentAverage(double NUM_ASSIGNMENTS,
        Scanner inputFile, double MAX_POINTS) {

    double sum = 0;
    double average = 0;

    for (int i = 0; i < NUM_ASSIGNMENTS; i++) {
        sum = sum + inputFile.nextDouble();
    }
    average = (sum / MAX_POINTS) * 100;

    return average;
}

Answer 1

拜伦是对的。 您晋升为下一位学生的逻辑过早地执行。 假设它们适用于同一学生，则在继续下一个循环之前，您需要阅读第3至6行。

另外，在阅读完一本书之后，扫描仪将不会自动前进到下一行。 您需要明确地执行此操作。