java - 我没有得到这样的元素异常:运行我的项目时找不到文件
问题描述
在注册方法出现错误请有人调试它。我已经尝试了所有方法,但仍然出现此异常:未找到文件。我想我已经正确地完成了这个功能。函数应该获得数学 101、英语 101 等课程并相应地获得学费。
package studentDatabaseApp;
import java.util.Scanner;
public class Student {
private String firstName;
private String lastName;
private int gradeYear = 0;
private String studentID;
private String courses = null;
private static int courseCost = 600;
private int tutionBalance = 0;
private static int id = 1000;
//Constructor to enter student name and year for each student
public Student() {
Scanner scan = new Scanner(System.in);
System.out.print("Enter Student First Name: ");
this.firstName = scan.nextLine();
System.out.print("Enter Student Last Name: ");
this.lastName = scan.nextLine();
System.out.print("1 - Freshmen\n2 - Sophmore\n3 - Junior\n4 - Senior\nEnter Student Grade Year: ");
this.gradeYear = scan.nextInt();
scan.close();
//Setting student id
setStudentID();
System.out.println("STUDENT CREATED: "+ firstName +" "+ lastName +" "+"\nGRADE LEVEL:"+" "+gradeYear+ " "
+"\nSTUDENT ID: "+ studentID);
}
//Unique id and student grade level
private void setStudentID() {
id++;
this.studentID = gradeYear + "" + id;
}
//Create courses so student can enroll
public void enroll() {
do {
System.out.print("Enter course to enroll (Q to Quit): ");
Scanner in = new Scanner(System.in);
String course = in.nextLine();
if(!course.equals("Q")) {
courses = courses + "\n" + course;
tutionBalance = tutionBalance + courseCost;
} else {
System.out.println("Break");
break;
}
in.close();
} while(1 != 0);
System.out.println("ENROLLED IN: "+ courses);
System.out.println("TUTION BALANCE: "+ tutionBalance);
}
//Student should able to view their balance and pay the tution
//Student status with their name, ID, course enrolled and balance
}
解决方案
当您第一次关闭扫描仪时,您也会关闭,因此当您第二次System.in
尝试访问时,您会遇到异常,请尝试重构您的代码,以便您在课堂上只使用一个扫描仪。System.in
enroll()
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