为学校做一个项目,当我尝试输入数组的学生人数时出现错误。错误是
线程“主”java.lang.ArrayIndexOutOfBoundsException 中的异常:
在 Project1.enterStudents(Project1.java23)
在 Project1.mainMenu(Project1.java59)
在 Project1.enterStudents(Project1.java7) -1
我在下面编写的代码一如既往地受到任何帮助。
import java.util.Scanner;
public class Project1{
public static void main(String[] args){
Scanner input = new Scanner(System.in);
Project1 project1 = new Project1();
project1.mainMenu();
}//main
int numOfStudents;
Student[] students = new Student[numOfStudents];
public void enterStudents(){
Scanner input = new Scanner(System.in);
System.out.println("Enter number of students");
numOfStudents = input.nextInt();
int i;
for(i = 0; i <= numOfStudents - 1; i++){
i--;
System.out.println("Enter student's ID: ");
students[i].getId();
System.out.println("Enter student's first name: ");
students[i].getFirst();
System.out.println("Enter student's last name: ");
students[i].getLast();
System.out.println("Enter student's class: ");
students[i].getStuClass();
}
}
public void retrieveStuId(){
Scanner input = new Scanner(System.in);
System.out.println("Enter student id");
}
public void Exit(){
System.exit(0);
}
public void mainMenu(){
Scanner input = new Scanner(System.in);
System.out.println("1 - Enter student info");
System.out.println("2 - Retrieve student by ID");
System.out.println("3 - Retrieve student by last name");
System.out.println("4 - Update student");
System.out.println("5 - Exit");
int menuSelect = input.nextInt();
if (menuSelect != 1 && menuSelect != 2 && menuSelect != 3 && menuSelect != 4 && menuSelect != 5)
System.out.println("That is not a option");
else
switch (menuSelect){
case 1: enterStudents();
case 2: System.out.print("case 2");
case 3: System.out.print("case 3");
case 4: System.out.print("case 4");
case 5: Exit();
}
}
}//project1
class Student{
private int studentID;
private String firstName;
private String lastName;
private String stuClass;
public Student(){
}
public Student(int id, String first, String last, String c ){
studentID = id;
firstName = first;
lastName = last;
stuClass = c;
}
public void setID (int id){
studentID = id;
}
public void setStuClass (String c){
stuClass = c;
}
public void setFirst(String first){
firstName = first;
}
public void setLast(String last){
lastName = last;
}
public String getFirst(){
return firstName;
}
public String getLast(){
return lastName;
}
public int getId(){
return studentID;
}
public String getStuClass(){
return stuClass;
}
public String toString(){
return "Student ID: " + studentID + " ---- " + "Student Name: " + firstName + "" + lastName + " ---- " + "Class:" + stuClass;
}
}