[英]Java Input Mismatch Reading from Text File
我正在編寫一個程序,它將從充滿學生成績的文本文件中獲取輸入。 這些成績取平均值並添加到數組列表中。 我在讀取文件時遇到了麻煩。 我收到輸入不匹配的信息。 我嘗試將calcAssignmentAverage方法中的循環更改為小於15(有15個實驗室等級,即文本文件中的第二行),但是它仍然提供輸入不匹配的信息。
文件(實際文件有16個學生,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
碼:
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;
}
拜倫是對的。 您晉升為下一位學生的邏輯過早地執行。 假設它們適用於同一學生,則在繼續下一個循環之前,您需要閱讀第3至6行。
另外,在閱讀完一本書之后,掃描儀將不會自動前進到下一行。 您需要明確地執行此操作。
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