Question

I am trying to get the first line of a file with java and I am not sure why it is not working or why I am getting the error i am getting. This is the first time I have tried this in java.

Error

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 16
    at getSum.main(getSum.java:33)

Code

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.File;
import java.io.FileNotFoundException;
public class getSum {

    public static void main(String[] args) {
            File file = new File("path/InputArray.txt");
            FileInputStream fis = null;
            BufferedInputStream bis = null;
            DataInputStream dis = null;
            String line = null;
            try{
                fis = new FileInputStream(file);
                bis = new BufferedInputStream(fis);
                dis = new DataInputStream(bis);

                while(dis.available() != 0){
                    line = dis.readLine();
                }
            }catch (FileNotFoundException e){
                e.printStackTrace();
            }catch (IOException e){
                e.printStackTrace();
            }
            String[] splitLine = line.split("\\s+");
            int[] numbers = new int[splitLine.length];

            for(int i = 0; i< line.length(); i++){
                try{
                    numbers[i] = Integer.parseInt(splitLine[i]);
                }catch(NumberFormatException nfe){};
            }


           int amount = 0;
           System.out.print(numbers.length);
           /*amount = sumArray(0,numbers.length,numbers.length,numbers);
           System.out.print("Total: " + amount);*/
    }

Answer 1

Look at this:

int[] numbers = new int[splitLine.length];
for(int i = 0; i< line.length(); i++){
    try{
        numbers[i] = Integer.parseInt(splitLine[i]);
    }catch(NumberFormatException nfe){};
}

You’re using i from 0 to line.length()… which isn’t the same as splitLine.length. I suspect you meant:

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

At that point, as both numbers and splitLine have the same length, you definitely won’t get an ArrayIndexOutOfBoundsException.