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Java

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

    while(fileinput.hasNext()){
        //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 {
            txtfiles.add(nextfile);

        }
    }
        //close streams
        fileinput.close();
        file.close();

        //print result
        for (int i = 0; i < txtfiles.size(); i++){
            System.out.println(Arrays.asList(txtfiles));
        }

}
}