帮助我!!!!!!!：线程“主”中的例外情况java.lang.ArrayIndexOutOfBoundsException：0 [英] Help me!!!!!!!: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0

问题描述

当我构建项目时，我的主课有问题..



我收到消息：



[성적처리프로그램]

몇명의학생들의数据를입력하시겠습니까？

2

1번째학생

이름을입력하세요：

chos

线程main中的异常java.lang.ArrayIndexOutOfBoundsException：0
HW02_2的
。 addinfo（HW02_2.java:18）
$ 03 $ b在HW02_2.main（HW02_2.java:95）

I have a problem with my main class when I build my project..

I get message :

[성적처리 프로그램]
몇명의 학생들의 data를 입력하시겠습니까?
2
1번째 학생
이름을 입력하세요 :
chos
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
at HW02_2.addinfo(HW02_2.java:18)
at HW02_2.main(HW02_2.java:95)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;


public class HW02_2 {
	public static void addinfo(int num, int[][] array) throws IOException{ // InputStream 객체에 리더를 연결
		int student_num = num;
		for(int i = 0; i < num ; i++){
		//get name info
			int intname = 0;
			InputStreamReader s = new InputStreamReader(System.in);
			BufferedReader in = new BufferedReader(s);
			 
			System.out.println(i+1+"th student\n enter name : ");
		    intname = s.read();
		    array[i][0] = intname;
        // codenumber는?[1]
            System.out.println("enter code number : ");
            Scanner codenum = new Scanner(System.in);
            array[i][1] = codenum.nextInt();
            codenum.close();
        //korean score[2]
            System.out.println("enter korean score : ");
            Scanner korscore = new Scanner(System.in);
            array[i][2] = korscore.nextInt();
            korscore.close();
        //English score[3]
            System.out.println("enter english score : ");
            Scanner engscore = new Scanner(System.in);
            array[i][3] = engscore.nextInt();
            engscore.close();
        //math score[4]
            System.out.println("enter math score : ");
            Scanner mathscore = new Scanner(System.in);
            array[i][4] = mathscore.nextInt();
            mathscore.close();
		}
		show(student_num, array);
	}
	static void show(int num, int[][] array){
		for(int i = 0; i < num ; i++){
			calculate(i, array);
		}
		// sorting by average
		int temp[] = null;
		for(int i = 0; i < num-1; i++){
			for(int j = i+1; j < num; j++){
				if(array[i][6] < array[j][6]){
					temp = array[i];
					array[i] = array[j];
					array[j] = temp;
				}
			}
		}
		// print result
		System.out.println("[Result]");
		for(int i = 0; i < num; i++){
			char grade = 'F';
			if(array[i][6] >= 90){
				grade = 'A';
			}else if(array[i][6] >= 80 && array[i][6] <= 89){
				grade = 'B';
			}else if(array[i][6] >= 70 && array[i][6] <= 79){
				grade = 'C';
			}else if(array[i][6] >= 60 && array[i][6] <= 69){
				grade = 'D';
			}else if(array[i][6] < 60){
				grade = 'F';
			}
			
			System.out.print((char)array[i][0]+""+array[i][1]+" "+array[i][2]+" "
			+array[i][3]+" "+array[i][4]+" "+array[i][5]+" "+array[i][6]+" "+grade+" "+i+1);
		}
	}
	static void calculate(int i, int[][]array){
		//total[5]
		for(int j = 2; j == 4; j++){
			array[i][5] += array[i][j];
		}
		//average[6]
		array[i][6] = array[i][5] / 3;
	}
	public static void main(String[] args) throws IOException {
		int[][] studentinfo = {};
		int students_num = 0;
		
			System.out.println("[성적처리 프로그램]\n몇명의 학생들의 data를 입력하시겠습니까?"); 
			Scanner s = new Scanner(System.in);
			students_num = s.nextInt();
			
			addinfo(students_num, studentinfo);
			s.close();
			
		
	}
}

推荐答案

所以看看 array 并查看它被声明为的大小。

x维度中没有足够的元素，因此i溢出它，或者更少在y维度中超过7： array [x] [y] 。



我们不能为你做到这一点 - 所以使用调试器，看看发生了什么！

So look at array and see what sizes it is declared as.
Either there are not enough elements in the "x" dimension so "i" is overflowing it, or there are less than 7 in the "y" dimension: array[x][y].

We can't do that for you - so use the debugger and look at what is happening!

你可能想要改变这个部分

You may want to change this part

public static void main(String[] args) throws IOException {
        int[][] studentinfo = {};
        int students_num = 0;

            System.out.println("[성적처리 프로그램]\n몇명의 학생들의 data를 입력하시겠습니까?");
            Scanner s = new Scanner(System.in);
            students_num = s.nextInt();

            addinfo(students_num, studentinfo);
            s.close();


    }

As

As

public static void main(String[] args) throws IOException {
        int students_num = 0;

            System.out.println("[성적처리 프로그램]\n몇명의 학생들의 data를 입력하시겠습니까?");
            Scanner s = new Scanner(System.in);
            students_num = s.nextInt();


            int[][] studentinfo = new int[students_num][7];


            addinfo(students_num, studentinfo);
            s.close();


    }

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