Reading from file double value using Scanner - InputMismatchException?

Question

I tried read from file double values and using Scanner with this aim.

It throws InputMismatchException :

\"input.txt\"  java.util.InputM         


        

Answer 1

Try this

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

public class MainClass{
public static void main(String[] args)
        throws FileNotFoundException
{
    Scanner in = new Scanner(new File("D:\\input.txt"));
    String largestNum=in.next().trim();
    double largest = Double.parseDouble(largestNum);
    while (in.hasNextDouble())
    {
        String Num=in.next().trim();
        double input = Double.parseDouble(Num);
        if (input > largest)
        {
            largest = input;
        }
    }
    in.close();
    System.out.println("Largest value: " + largest);
} }