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Reading and adding multiple files to an array in java

I have a java project where i'm meant to read 1000 text files and print the word frequency for each of them. I want to add the text files to an array so i can use threads to read the files since each file is not meant to be read more than once but i'm having problems adding them to the array. "file" is a subfolder containing text files

import java.io.; import java.util.; public class WordFrequency {

public static void main(String[] args) throws IOException{

    FileInputStream file = new FileInputStream("files");
    Scanner fileinput = new Scanner(file);

    //create array list  to hold text files 

    ArrayList<Object> txtfiles = new ArrayList<Object>();

    //read through  and find text files

        //get the next file

        Object nextfile = fileinput.next();

        //Determine if file is in  the array list

        if (txtfiles.contains(nextfile)) {
            int index = txtfiles.indexOf(nextfile);

        else {

        //close streams

        //print result
        for (int i = 0; i < txtfiles.size(); i++){