Tweet.java

import java.util.*;

public class Tweet {

    // Class variables to store tweet details
    String username;
    String message;
    long timestamp;   //milliseconds
    Set<String> likes;  // Set to store the usernames of people who liked the tweet

    // Constructor to initialize a new tweet with the username and message
    public Tweet(String username, String message) {
        this.username = username;  // Username who posted the tweet
        this.message = message;    // Message of the tweet
        this.timestamp = System.currentTimeMillis();  // Time when the tweet was posted
        this.likes = new HashSet<>();  // Makes sure no duplicate users can like the tweet
    }

    // Method to display the tweet's details
    public void displayTweet() {
        System.out.println("[" + timestamp + "] @" + username + ": " + message);
        System.out.println("Likes: " + likes.size());
    }

    // Method to add a like to the tweet by a user
    public void addLike(String username) {
        likes.add(username);
    }
}