reading data from a file into array

Question

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.Scanner;

public class question2_Arrays {


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

    double[]loanbalanceArray = new double[500];
    int index = 0;

    File file = new File("loanbalance.txt");
    Scanner inputFile = new Scanner(file);

    while(inputFile.hasNext()&& index<loanbalanceArray.length){
        loanbalanceArray[index] = inputFile.nextInt();
        index ++;
        }
    inputFile.close();

I am trying to read the contents of the text file loanbalance into an array sized 500 this is what i have so far but when i execute the program it gives me this error "Exception in thread "main" java.util.InputMismatchException at java.util.Scanner.throwFor(Unknown Source) at java.util.Scanner.next(Unknown Source) at java.util.Scanner.nextInt(Unknown Source)"

any suggestions where i could be going wrong?

Answer 1

while (inputFile.hasNextDouble() || index<loanbalanceArray.length){
    loanbalanceArray[index] = inputFile.nextDouble();
    index ++;
    }

Use inputFile.hasNextInt method. Your input can return true on hasNext call but it can be not int or null and throw exception during call of loanbalanceArray[index] = inputFile.nextDouble();

And according to your comments you're using loanbalanceArray[index] = inputFile.hasNextDouble() for assignment, but you should use loanbalanceArray[index] = inputFile.nextDouble()

hasNextDouble() checking if your input has double value further and returns Boolean is so but nextDouble() returns actual next Double value of input