Capitalize a String using FileOutputStream in Java

Problem:

Using a FilelnputStream, you should read a list of strings from a file called "strings.txt". The first line in the file will represent the number of lists. After reading the lists and storing them in a String array, you should use a FileOutputStream and save the lists to a file called "stringsUp.txt". The string should be saved in upper case.

Output:

3
The quick brown fox
Java is King
This lab is awesome

THE QUICK BROWN FOX
JAVA IS KING
THIS LAB IS AWESOME

Solution:

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;

public class ProblemB {

 public static void main(String args[]) {
  try {
   Scanner scan = new Scanner(new File("strings.txt"));
   
   int n = scan.nextInt();
   scan.nextLine();
   String[] strings = new String[n];
   
   for (int i = 0; i < n; i++)
    strings[i] = scan.nextLine();
   
   scan.close();
   
   PrintWriter out = new PrintWriter(new File("stringsUp.txt"));
   
   for (int i = 0; i < n; i++) {
    out.println(strings[i].toUpperCase());
    out.flush();
   }
   
   out.close();
   
  } catch (IOException e) {
   System.err.println("Could not read from file");
  }
 }
}