控制台中的java输出为空

Question

它显示空异常。现在该怎么办

import java.io.File;
import java.util.Scanner;

public class Quiz1 {

    public static void main(String[] args) {
        File f = new File("QuizMark.txt");
        try{
            Scanner s = new Scanner (f);
            QuizMark[] p = new QuizMark[10];
            while(s.hasNext()==true)

            {
                int c = s.nextInt();
                double d = s.nextInt();             
                for(int i=0;i<10;i++){
                p[i]= new QuizMark(c,d);
                System.out.println(p[i].getId());
                System.out.println(p[i].getScore());
                i++;
                }
            }
        }
                catch(Exception e){
                    System.out.println(e.getMessage()); 
                    }
    }

}

Answer 1

首先，您的文件必须定义保存在其中的数据模式，如用逗号或连字符分隔的标记和id、下划线等，无论您想保存什么模式。下一个数据应该在下一行。然后以正确的方式阅读保存在文件中的文本

示例QuizMarks。文本

01,96.5
02,78.9
03,65
04,89.7

Java代码

 int count = 0;
 String s[];
 String line="";
 QuizMark[] p = new QuizMark[10];

 BufferedReader br= new BufferedReader(new FileReader("QuizMark.txt"));

 while(line=br.readLine()!=null){

 s=line.split(",");//your data separated by symbol in file 

 //First Record with id and marks 

 int id =Interger.parseInt(s[0]); //conversion from string to int
 double marks = Double.parseDouble(s[1]); //conversion from string to double

 p[count]= new QuizMark(id,marks);
 count++;


 }