Question

I have a simple Java questions and I need a simple answer, if possible. I need to input the data from the file and store the data into an array. To do this, I will have to have the program open the data file, count the number of elements in the file, close the file, initialize your array, reopen the file and load the data into the array. I am mainly having trouble getting the file data stored as an array. Here’s what I have:

The to read file is here: https://www.dropbox.com/s/0ylb3iloj9af7qz/scores.txt

import java.io.*;
import java.util.*;
import javax.swing.*;
import java.text.*;


public class StandardizedScore8
{



//Accounting for a potential exception and exception subclasses
public static void main(String[] args) throws IOException
{
    // TODO a LOT
    String filename;
    int i=0;


    Scanner scan = new Scanner(System.in);
    System.out.println("\nEnter the file name:");
    filename=scan.nextLine();



    File file = new File(filename);


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

    String [] fileArray = new String [filename];
    //Scanner inFile = new Scanner (new File ("scores.txt"));

    //User-input
//  System.out.println("Reading from 'scores.txt'");
//  System.out.println("\nEnter the file name:");
//  filename=scan.nextLine();

    //File-naming/retrieving
//  File file = new File(filename);
//  Scanner inputFile = new Scanner(file);

Answer 1

Yes, you can if you don’t care about the trouble of doing things twice. Use while(inputFile.hasNext()) i++;

to count the number of elements and create an array:

String[] scores = new String[i];

If you do care, use a list instead of an array:

List<String> list = new ArrayList<String>();
while(inputFile.hasNext()) list.add(inputFile.next());

You can get list elements like list.get(i), set list element like list.set(i,"string") and get the length of list list.size().

By the way, your line of String [] fileArray = new String [filename];is incorrect. You need to use an int to create an array instead of a String.