Company: STRIPE

Java: Social Network Interaction System

Design and implement a social media platform where users can follow and unfollow each other, post content, and receive notifications about new posts from the users they follow. You should print a message when a new user is added, when a user follows or unfollows another user, and when a user posts or receives a notification.

Complete the following meth ods:

1. User class:
- update(String message, User followee): void, should print: "{UserName} received notification: {followeeName} posted: {message}."
- addFollowers(User user): void
- removeFollowers(User user): void
- notifyFollowers(String message): void
- post(String content): void, should print: "{UserName} posted: \"{content}\""
- follow(User user): void
- unfollow(User user): void

2. Platform class:
- addUser(Integer id, String name): void, should print: "{UserName} added successfully."
- follow(Integer followerId, Integer followeeId): void, should print: "{FollowerName} is now following {FolloweeName}."
- unfollow(Integer followerId, Integer followeeId): void, should print: "{FollowerName} has unfollowed {FolloweeName}."
- post(Integer userId, String content): void

Input Format: You are not responsible for reading any input from stdin.

Output Format: You should print a message when a new user is added, when a user follows or unfollows another user, and when a user posts or receives a notification.

Input Format for Custom Testing:

Sample Case 0

Sample Input 0:
8
Add User 0 Alexander
Add User 1 Isabella
Add User 2 Emma
Follow 1 0
Post 0 Hiking in the mountains.
Follow 2 0
Post 0 Enjoying a beautiful day!
Unfollow 1 0

Sample Output 0:
Alexander added successfully.
Isabella added successfully.
Emma added successfully.
Isabella is now following Alexander.
Alexander posted: "Hiking in the mountains.".
Isabella received notification: Alexander posted: "Hiking in the mountains.".
Emma is now following Alexander.
Alexander posted: "Enjoying a beautiful day!".
Isabella received notification: Alexander posted: "Enjoying a beautiful day!".
Emma received notification: Alexander posted: "Enjoying a beautiful day!".
Isabella has unfollowed Alexander. Show More