Reading characters in file

I have to write a program that asks the user to enter a filename, and also a specific character that they want to be read. The program will display the amount of times that it is in the file.

An example of this would be:

Enter file: t.txt
Enter character to read throughout file: a

here is what i have so far. Everything so far seems to be right, but I am having trouble declaring the char value for this. Any help would be very appreciated.

import java.util.Scanner;
 import java.io.*;
 
 public class FileLetterCounter {
 	 public static void main(String[] args) throws IOException {
 	 	 
 	 	 // declare variables
 	 	 String fileName;
 	 	 int times = 0;
 	 	 String letter;
 	 	 char character;
 	 	 Scanner nameScan = new Scanner(System.in);
 	 	 
 	 	 // getting the name of the file.
 	 	 System.out.print("Enter the name of the file:  ");
 	 	 fileName = nameScan.nextLine();
 	 	 
 	 	 // getting the letter the file will read
 	 	 System.out.print("Enter the letter for the file to search:  ");
 	 	 letter = nameScan.nextLine();
 	 	 
 	 	 // open the file
 	 	 File file = new File(fileName);
 	 	 
 	 	 if(file.exists()) {
 	 	 	Scanner fileScan = new Scanner(file);
 	 	 
 	 		 // reading the file
 	 	 	while(fileScan.hasNext()) {
 	 	 		 for(int i = 0; i < letter.length(); i++) {
 	 	 	 		if(letter.charAt(i) == character)
 	 	 	 			times++;
 	 	 	 		else
 	 	 	 			times = 0;
 	 	 	 	}
 	 	 	}
 	 	 
 	 	 	// close file
 	 	 	fileScan.close();
 	 	 	
 	 	 	// display information
 	 	 	System.out.println("The file contains \'" + letter + "\' " + times + " time(s).");
 	 	 }
 	 	 
 	 	 else {
 	 	 	System.out.println("Error 332: Cannot find file.");
 	 	 	System.exit(0);
 	 	 }
 	 }
 }