как создать массив новых имён пользователя чата?

import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;
 
public class ChatReader {
 
    /**
     * The filename of the chat log to be read.
     */
    private String fileName;
 
    /**
     * Constructor that takes the path to a chat log 
     * file as a parameter. 
     * 
     * @param fileName Path to the chat log file.
     */
    public ChatReader(String fileName) {
        this.fileName = fileName;
    }
 
    /**
     * Reads the file and returns an array of 
     * {@link String}s, where each element in the array 
     * represents a line in the document.
     * 
     * @return An array of Strings representing the lines of 
     * the document.
     */
    public String[] getMessages() {
        try {
            // path to the chat log file
            Path p = Paths.get(this.fileName);
            // read all lines and store them in a list
            List<String> lines = Files.readAllLines(p, Charset.forName("US-ASCII"));
            // return all messages in a String[]
            String[] messages = 
                    lines.toArray(new String[lines.size()]);
            return messages;
        } catch (IOException e) {
            System.err.println("Couldn't read " + this.fileName + "\n Did you give me the correct path?");
        }
        return new String[]{};
    }
 
}

import java.io.File;
import java.nio.file.Paths;
import java.nio.file.Path;
 
public class Main {
  
  public static void main(String[] args) {
    
    // declare directory of the file that shall be read
    Path inpath =  Paths.get("D:/Java/...") ;
    
    // add file to be read to path
    Path pchat = inpath.resolve("ubuntu_chatlog.txt");
    
    // create chat reader for the input file (argument must be a string!)
    ChatReader reader = new ChatReader(pchat.toString());
    
    // read the lines from the input file into a string array
    String[] messages = reader.getMessages();
    
    // display the number of messages on the screen
    System.out.println("The array contains " + messages.length+1 + " messages.");
 
// declare an output directory
    Path outpath = inpath;
    
    // define one or more output files
    Path pout1 = outpath.resolve("output1.txt");
    
    // define (buffered) writer(s) for output of data to pout1,.. 
    MessageWriter writer = new MessageWriter(pout1.toString());
    
 
    
    
    
    
  }
  
  
}

public class UserNames {
    public static void main(String[] args) {
        User user = new User("Маша");
        user.setName("Даша");
        user.setName("Гриша");
        user.setName("Вася");
        user.setName("Маша");
        user.setName("Лиза");
 
        System.out.println("Текущее имя: " + user.getName());
        System.out.println("Все имена: " + user.getNamesHistory());
    }
}
 
class User {
    private String name;
    private Set<String> names = new HashSet<>();
 
    User(String name) {
        this.name = name;
    }
 
    void setName(String name) {
        this.name = name;
        names.add(name);
    }
 
    String getName() {
        return name;
    }
 
    ArrayList<String> getNamesHistory() {
        return new ArrayList<>(names);
    }
}