PrintStream error in main "variable output is already defined in main"

Question

I'm currently attempting to make my code produce an output file by using the PrintStream method. MY textbook suggests that I use this particular line of code within my main:

    PrintStream output = new PrintStream(new File("results.txt"));

However, when I type up this line of code, Java gives me the following error:

    Personality.java:17: error: variable output is already defined in method main(String[])
    PrintStream output = new PrintStream(new File("results.txt"));
                ^
    Personality.java:23: error: cannot find symbol
        output.println();
              ^

My main method currently looks like this:

    public class Personality {
public static void main (String[] args)  throws FileNotFoundException   {
    Scanner input = new Scanner(System.in);
    intro();
    Scanner output = asksForFile(input);
    PrintStream output = new PrintStream(new File("results.txt"));
  while(output.hasNextLine()){
        int[] aCounts = new int[4];
        int[] bCounts = new int[4];
        String name = output.nextLine();
        String data = output.nextLine();
        output.println();
        System.out.print(name + ": ");
        int[] percentB = numberOfAnswers(name, data, aCounts, bCounts);
        output.print(Arrays.toString(percentB));
     output.print(" = ");
        output.println(determineType(percentB));    
    }       
}

I'm guessing from the error, that I can't have output defined twice in a single method, but if I don't define my output, how will my program know what that symbol is? Also, if I already have output define within main, what else can I call it to make the PrintStream work, while also keeping the rest of the program running as well?

I renamed the variables of "output" in my main to scanner, but I'm getting this new error instead:

    Personality.java:34: error: cannot find symbol
    output.println("This program processes a file of answers to the");
    ^
      symbol:   variable output
  location: class Personality

This is what my entire code looks like at the moment:

import java.util.*;
import java.io.*;

public class Personality {
    public static void main (String[] args)  throws FileNotFoundException   {
        Scanner input = new Scanner(System.in);
        intro();
        Scanner scanner = asksForFile(input);
        PrintStream output = new PrintStream(new File("results.txt"));

      while(scanner.hasNextLine()){
            int[] aCounts = new int[4];
            int[] bCounts = new int[4];
            String name = scanner.nextLine();
            String data = scanner.nextLine();
            output.println();
            System.out.print(name + ": ");
            int[] percentB = numberOfAnswers(name, data, aCounts, bCounts);
            output.print(Arrays.toString(percentB));
         output.print(" = ");
            output.println(determineType(percentB));    
        }       
    }

   //Introduces the program
    public static void intro()  {
        output.println("This program processes a file of answers to the");
        output.println("Keirsey Temperament Sorter.  It converts the");
      output.println("various A and B answers for each person into");
      output.println("a sequence of B-percentages and then into a");
        output.println("four-letter personality type.");
        output.println();       
    }

    //Asks for input file
    public static Scanner asksForFile(Scanner input) throws FileNotFoundException   {
        output.print("input file name? ");
        String filename = input.nextLine();
        return new Scanner(new File(filename));

    }

   //This while loop puts counts inside arrays
    public static int[] numberOfAnswers(String name, String data, int[] aCounts, int[] bCounts)  throws FileNotFoundException   {
        data = data.toLowerCase();
        for (int i = 0; i < data.length(); i++) {
            int x = ((i % 7) + 1) / 2;
            if (data.charAt(i) == 'a'){
                aCounts[x]++;
            } else if(data.charAt(i) == 'b'){
                bCounts[x]++;
            }
        }
        return percentB(aCounts, bCounts);
    }

    public static void printOutcome(int[] aCounts, int[] bCounts){
        String[] ratios = new String[4];
        for(int i = 0; i < 4; i++){
            String temp = aCounts[i] + "A-" + bCounts[i] + "B";
            ratios[i] = temp;
        }
        output.println(Arrays.toString(ratios));
    }

    public static int[] percentB(int[] aCounts, int[] bCounts){
        int[] percentB = new int[4];
        for(int i = 0; i < 4; i++){
            double percent = (double) bCounts[i] / (aCounts[i] + bCounts[i]);
            percentB[i] = (int) Math.round(percent * 100);
        }
        return percentB;    
    }

    public static String determineType(int[] percentB){
        String sub50 = "ESTJ";
        String sup50 = "INFP";
        String type = "";
        for(int i = 0; i < 4; i++){
            if(percentB[i] > 50){
                type += sup50.charAt(i);
            } else if(percentB[i] < 50){
                type += sub50.charAt(i);
            } else {
                type += "X";
            }
        }
        return type;
    }

}

Answer 1

The code has two variables with the same name, which is not allowed. Change one of these variable names and refactor the code:

Scanner output = asksForFile(input);
PrintStream output = new PrintStream(new File("results.txt"));

REFACTORED VERSION

public class Personality {
    public static void main (String[] args)  throws FileNotFoundException   {
        Scanner input = new Scanner(System.in);
        intro();
        Scanner scanner = asksForFile(input);
        PrintStream output = new PrintStream(new File("results.txt"));

        while(scanner.hasNextLine()){
            int[] aCounts = new int[4];
            int[] bCounts = new int[4];
            String name = scanner.nextLine();
            String data = scanner.nextLine();
            output.println();
            System.out.print(name + ": ");
            int[] percentB = numberOfAnswers(name, data, aCounts, bCounts);
            output.print(Arrays.toString(percentB));
            output.print(" = ");
            output.println(determineType(percentB));    
        }       
    }
}

NOTE There are several methods in this code snippet for which the source is not provided. This version may need additional refactoring given these unknowns.