Java BufferedReader while循环越界异常

Question

我正在使用 BufferedReader 从文本文件中读取数据。变量“reg”是我尝试访问的数据字符串中的第四个条目。

我收到异常:“线程“main”中的异常 java.lang.ArrayIndexOutOfBoundsException: 3”

这是我的代码:

package calctest;

import static calctest.CalcTest.reg;
import java.io.*;

public class CalcTest {

    static Integer reg, prov;

public static void main(String[] args) throws Exception{

String readFile = "M:\\MandNDrives\\mwallace\\JAVA for NEMS\\EORModule\\NEMSEORDB.txt";
    BufferedReader br = null;
    String line = "";
    String delim = "[ ]+";

    try {        
        br = new BufferedReader(new FileReader(readFile));
        br.readLine();
        while ((line = br.readLine()) != null) {

            String [] reservoir = line.split(delim);

            reg = Integer.parseInt(reservoir[3]);

            System.out.println(reg);

         }
         }catch (FileNotFoundException e) {
         }catch (IOException e) {

       }    

     }

  }

Answer 1

您的错误与阅读无关。错误是水库(有时)的长度小于 4。

 while ((line = br.readLine()) != null) {
        String [] reservoir = line.split(delim);

        for(String s : reservoir)
            System.out.println(s);  //Post what this outputs for debugging purposes

        if (resivoir.length > 3)
            reg = Integer.parseInt(reservoir[3]);
        else
            reg = ... //do something else...

        System.out.println(reg);

 }