How do I use an arraylist created in another method [closed]

Question

I right now made an arraylist and returned it just like in a void Right now I got something like this I know I have to change the static void t something else to return it but I lost that version of the code.

package Spel;

import java.util.ArrayList;
import java.awt.event.KeyEvent;
import Tools.*;
import java.awt.Color;
import java.util.Scanner;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;


Public Class Surrounding{

 public String a;

 public static void main(String[] args) { // this just selects different specific words to put into an arraylist
        File f = new File("words.txt");
        try (FileReader fr = new FileReader(f);
             BufferedReader br = new BufferedReader(fr)) {
            List<String> list = new ArrayList<>();
            String line = br.readLine();
            while (line != null) {
                if (line.length() == 4) {
                    list.add(line);
                }
                line = br.readLine();
            }
            System.out.println(list);
        }
        catch (IOException xIo) {
            xIo.printStackTrace();
        }

    public void otherstuff(){
    list.get(6)
    // here I want to do some stuff with some values out of the arraylist
    }
    
}

What do I do to use the filled list from the one void to the other? The problem is not the ArrayList filling or any mistakes I make in the declaring of the ArrayList just how to use the returned list