Why can't I call readFile method

[jwl]

I have a readFile() method that creates an array of the size of the first number in the file being read. In this case I have a list of 14 numbers like this in a .txt file:

13
100
111
112
113
115
...
...
... (until there are 14 numbers)

So it creates an array of size 13 and puts the following numbers in the array. What I need help with is I am trying to test to see if the numbers after 13 print out so i can know that they were stored in the array. The problem occurs at line 39 when I try to call the readFile() method from the main method.

package readfile;

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

public class ReadFile {
    private Scanner read;
    private int numData;

   private void openFile() {
       try {
           read = new Scanner(new File("File.txt"));
       }
       catch (IOException e) {
           System.out.println("Could not open file input");
       }
   }
  
   private int[] readFile(String File) {
       numData = read.nextInt();
       read.nextLine();
       int[] data = new int[numData];
       for (int i = 0; i < numData; i++){
            data[i] = read.nextInt();
            System.out.printf("%s\n", File);
            read.nextLine();
       }
       return data;
   }
   
   private void closeFile() {
       read.close();
   }
   
    public static void main(String[] args) {
        ReadFile file = new ReadFile();
        file.openFile();
        file.readFile(File);  //line with error cannot find symbol: variable File
        file.closeFile();
    }
}

Any ideas? I'm tring to print the numbers stored in the array as they are stored.

[DarrylBurke]

The problem occurs at line 39 when I try to call the readFile() method from the main method.

        file.readFile(File);  //line with error

What error? Compiler error? Post the error message. Run time exception? Post the stack trace.

db

[JBelg]

On the line with the error you're using "File", this variable is never declared anywhere, it's also never used anywhere.
Just remove "File" on the line with the error and remove the arguments of the method "readFile". (String File)

[jwl]

What error? Compiler error? Post the error message. Run time exception? Post the stack trace.

db

file.readFile(File);  //line with error cannot find symbol: variable File

fixed it

[jwl]

On the line with the error you're using "File", this variable is never declared anywhere, it's also never used anywhere.
Just remove "File" on the line with the error and remove the arguments of the method "readFile". (String File)

I need (String File) arguments because that is how I access the content in File.txt in the readFile() method.

[JBelg]

This is where you retrieve all the data in the text file:

read = new Scanner(new File("File.txt"));

and this is how you get your data one by one:

...
numData = read.nextInt();
...

The string you're giving to the readFile() method is nothing more than a string.

so:

...
readFile("gibberish");
...

public int[] readFile(String File) {
System.out.printf("%s\n", File);
}

would print out:

gibberish

It's not really wrong, but it doesn't serve a real function besides spamming the string you gave.

[jwl]

I'm still fresh on these concepts so it's easy to get my head spinning but I got it to work.

private int[] readFile() {
       numData = read.nextInt();
       read.nextLine();
       int[] data = new int[numData];
        for (int i = 0; i < numData; i++) {
            data[i] = read.nextInt();
            System.out.printf("%s\n", data[i]);
       }
       return data;
   }