Question

我有这段代码，我正在尝试从addEntry（）方法获取用户输入并编写一个方法将其保存到文件中。

public class GradeBook {

private String course;
private ArrayList<Person> students = new ArrayList<Person>();
private ArrayList<GradeBookEntry> entries = new ArrayList<GradeBookEntry>();

public GradeBook(String course){
    this.course = course;
}

public String getCourse() {
    return course;
}

public void setCourse(String course) {
    this.course = course;
}

public void addStudent( Person student ){
    students.add(student);
}

public void addEntry(){
    System.out.println("Grade which student: ");
    for (int i = 0; i < students.size(); i++) {
        System.out.println(i + " " + students.get(i).getName());
    }
    Scanner reader = new Scanner(System.in);
    int studentIndex = reader.nextInt();
    reader.nextLine();

    System.out.println("Enter the assessment name: ");
    String assessmentName = reader.nextLine();

    System.out.println("Homework (1) or exam (2): ");
    int entryType = reader.nextInt();
    reader.nextLine();

    GradeBookEntry newEntry;
    // TODO: create either a Homework or Exam entry
    if( entryType == 1 ){
        newEntry = new HomeworkEntry(assessmentName);
    }
    else {
        newEntry = new ExamEntry(assessmentName);
    }

    // TODO: add getData method to the Homework and Exam
    newEntry.getData();
    newEntry.setStudent(students.get(studentIndex));

    entries.add(newEntry);
}

这是我创建的下面的方法，但文本文件中没有正确的数据，我想我不知何故需要第一种方法中的变量，如“studentIndex”“entryType”等，你能指出我在正确的方向？

public void writeFile(String fileName){
    try {
        FileWriter writer = new FileWriter(fileName);
        for (int i=0; i<entries.size(); i++){
            writer.write(students.get(i).toString());
        }
                    writer.close();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

Answer 1

覆盖toString类的Person应该是正确的方法。

将来自另一个java方法的输入写入文件

1 个答案: