for (String name : likedBy) { String likedUser= name.trim(); Set likes = likesMap.getOrDefault(likedUser, new HashSet<>()); Here you create a new Set for likes. This is in the iteration over the likers though so it results in many missing entries. [ How do i Fix this ] import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import java.util.ArrayList; import java.util.HashMap; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Set; public class FacebookLikeManager { private Map> likesMap; public FacebookLikeManager() { likesMap = new HashMap<>(); } public void buildMap(String filePath) { try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) { String line = reader.readLine(); while (line != null) { String[] lineWords = line.split(":"); String user = lineWords[0].trim(); String[] likedBy = lineWords[1].split(","); for (String name : likedBy) { String likedUser= name.trim(); Set likes = likesMap.getOrDefault(likedUser, new HashSet<>()); likes.add(user); likesMap.put(likedUser, likes); } line = reader.readLine(); } } catch (IOException ex) { System.err.format("IOException: %s%n", ex); } } public List getAllUsers() { return new ArrayList<>(likesMap.keySet()); } public List getLikes(String user) { Set liked = likesMap.get(user); if (liked == null) { liked = new HashSet<>(); } return new ArrayList<>(liked); } public List getLikedBy(String user) { List likedBy = new ArrayList<>(); for (Map.Entry> post : likesMap.entrySet()) { if (post.getValue().contains(user)) { likedBy.add(post.getKey()); } } return likedBy; } } public class Main { public static void main(String[] args) { FacebookLikeManager main = new FacebookLikeManager(); main.buildMap(args[0]); System.out.println(main.getAllUsers()); System.out.println(main.getLikes("Kristen")); System.out.println(main.getLikedBy("Sara")); } } Mike: Kristen, Sara, Nate, Anthony, Randy Kristen: Mike, John, Steve, Bill Bill: Sara, Nate Sara: Nate, Anthony.

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