Java 我怎样才能让它下次运行？ publicstaticvoidmain（字符串[]args）{ 扫描仪s=新的扫描仪（System.in）； 最终int学生人数=50； int i=0； char choice1='y'； 字符串[]stdntName=新字符串[50]； String[]WIDNUM=新字符串[STUDENT_SIZE]； int[]EXM1=新int[学生大小]； int[]EXM2=新int[学生大小]； int[]EXM3=新int[学生人数]； int[]finalExm=新int[学生人数]； 对于（i=0；i

这是错误消息：

是否要输入另一个？（是/否）：线程“main”java.lang.StringIndexOutOfBoundsException中的异常：字符串索引超出范围：0 位于java.base/java.lang.StringLatin1.charAt（StringLatin1.java:48） 位于java.base/java.lang.String.charAt（String.java:712） 在Proj4.main（Proj4.java:77）

只需添加

s.nextLine（）

，因为您的扫描仪没有到达获取

选项的点1

您的代码已修复

public static void main(String[] args) {
    
    Scanner s = new Scanner(System.in);
    
    
    final int STUDENT_SIZE = 50;
    
    
    
    int i = 0;
    char choice1 = 'y';
    
    String [] stdntName = new String [50];
    String [] WIDNUM = new String [STUDENT_SIZE];
    int [] EXM1 = new int [STUDENT_SIZE];
    int [] EXM2 = new int [STUDENT_SIZE];
    int [] EXM3 = new int [STUDENT_SIZE];
    int [] finalExm = new int [STUDENT_SIZE];
    
    
    for (i=0; i < stdntName.length; i++) {
        
        System.out.print("Please enter the name of Student " + (i+1) + ": ");
        stdntName[i] = s.nextLine();   
        
        System.out.println("Please enter the WID of Student " + (i+1) + ": ");
        WIDNUM[i] = s.nextLine();
        
            if (WIDNUM[i].length() != 9 ) {
                System.out.println("**Invalid WID...must be 9-digits");
                System.out.println("Please re-enter score:");
                WIDNUM[i] = s.nextLine();
            }
            
        System.out.println("Please enter score for Exam 1: ");
        EXM1[i] = s.nextInt();
        
            if (EXM1[i] < 0 || EXM1[i] > 50) {
                System.out.println("**Invalid score...please enter 0-50 only");
                System.out.println("Please re-enter score: ");
                EXM1[i] = s.nextInt();
            }
        
        System.out.println("Please enter score for Exam 2 ");
        EXM2[i] = s.nextInt();
        
            if (EXM2[i] < 0 || EXM2[i] > 50) {
                System.out.println("**Invalid score...please enter 0-50 only");
                System.out.println("Please re-enter score: ");
                EXM2[i] = s.nextInt();
            }
        
        System.out.println("Please enter score for Exam 3 ");
        EXM3[i] = s.nextInt();
        
            if (EXM3[i] < 0 || EXM3[i] > 50) {
                System.out.println("**Invalid score...please enter 0-50 only");
                System.out.println("Please re-enter score: ");
                EXM3[i] = s.nextInt();
            }
        
        System.out.println("Please enter score for Final Exam ");
        finalExm[i] = s.nextInt();
        
            if (finalExm[i] < 0 || finalExm[i] > 100) {
                System.out.println("**Invalid score...please enter 0-100 only");
                System.out.println("Please re-enter score: ");
                finalExm[i] = s.nextInt();
            }

            System.out.print("Do you wish to enter another? (y/n): ");
            choice1 = s.nextLine().toLowerCase().charAt(0); // read entire line
            if (choice1 != 'y') {
                break;
            }
                  
  }
 }  
}

publicstaticvoidmain（字符串[]args）{
扫描仪s=新的扫描仪（System.in）；
最终int学生人数=50；
int i=0；
char choice1='y'；
字符串[]stdntName=新字符串[50]；
String[]WIDNUM=新字符串[STUDENT_SIZE]；
int[]EXM1=新int[学生大小]；
int[]EXM2=新int[学生大小]；
int[]EXM3=新int[学生人数]；
int[]finalExm=新int[学生人数]；
对于（i=0；i50）{
System.out.println（“**无效分数…请仅输入0-50”）；
System.out.println（“请重新输入分数：”）；
EXM1[i]=s.nextInt（）；
}
System.out.println（“请输入考试2的分数”）；
EXM2[i]=s.nextInt（）；
如果（EXM2[i]<0 | | EXM2[i]>50）{
System.out.println（“**无效分数…请仅输入0-50”）；
System.out.println（“请重新输入分数：”）；
EXM2[i]=s.nextInt（）；
}
System.out.println（“请输入考试3的分数”）；
EXM3[i]=s.nextInt（）；
如果（EXM3[i]<0 | | EXM3[i]>50）{
System.out.println（“**无效分数…请仅输入0-50”）；
System.out.println（“请重新输入分数：”）；
EXM3[i]=s.nextInt（）；
}
System.out.println（“请输入期末考试分数”）；
finalExm[i]=s.nextInt（）；
if（finalExm[i]<0 | | finalExm[i]>100）{
System.out.println（“**无效分数…请仅输入0-100”）；
System.out.println（“请重新输入分数：”）；
finalExm[i]=s.nextInt（）；
}
s、 nextLine（）；
System.out.print（“是否要输入另一个？（y/n）：”；
choice1=s.nextLine（）.toLowerCase（）.charAt（0）；
 public static void main(String[] args) {

            Scanner s = new Scanner(System.in);


            final int STUDENT_SIZE = 50;



            int i = 0;
            char choice1 = 'y';

            String [] stdntName = new String [50];
            String [] WIDNUM = new String [STUDENT_SIZE];
            int [] EXM1 = new int [STUDENT_SIZE];
            int [] EXM2 = new int [STUDENT_SIZE];
            int [] EXM3 = new int [STUDENT_SIZE];
            int [] finalExm = new int [STUDENT_SIZE];


            for (i=0; i < stdntName.length; i++) {

                System.out.print("Please enter the name of Student " + (i+1) + ": ");
                stdntName[i] = s.nextLine();

                System.out.println("Please enter the WID of Student " + (i+1) + ": ");
                WIDNUM[i] = s.nextLine();

                if (WIDNUM[i].length() != 9 ) {
                    System.out.println("**Invalid WID...must be 9-digits");
                    System.out.println("Please re-enter score:");
                    WIDNUM[i] = s.nextLine();
                }

                System.out.println("Please enter score for Exam 1: ");
                EXM1[i] = s.nextInt();

                if (EXM1[i] < 0 || EXM1[i] > 50) {
                    System.out.println("**Invalid score...please enter 0-50 only");
                    System.out.println("Please re-enter score: ");
                    EXM1[i] = s.nextInt();
                }

                System.out.println("Please enter score for Exam 2 ");
                EXM2[i] = s.nextInt();

                if (EXM2[i] < 0 || EXM2[i] > 50) {
                    System.out.println("**Invalid score...please enter 0-50 only");
                    System.out.println("Please re-enter score: ");
                    EXM2[i] = s.nextInt();
                }

                System.out.println("Please enter score for Exam 3 ");
                EXM3[i] = s.nextInt();

                if (EXM3[i] < 0 || EXM3[i] > 50) {
                    System.out.println("**Invalid score...please enter 0-50 only");
                    System.out.println("Please re-enter score: ");
                    EXM3[i] = s.nextInt();
                }

                System.out.println("Please enter score for Final Exam ");
                finalExm[i] = s.nextInt();

                if (finalExm[i] < 0 || finalExm[i] > 100) {
                    System.out.println("**Invalid score...please enter 0-100 only");
                    System.out.println("Please re-enter score: ");
                    finalExm[i] = s.nextInt();
                }

                s.nextLine();

                System.out.print("Do you wish to enter another? (y/n): ");
                choice1 = s.nextLine().toLowerCase().charAt(0); // read entire line
                if (choice1 != 'y') {
                    break;
                }

            }
        }
    }