Comparator in Java
class User { public int userId; public String username; public String address; public User(int userId, String username, String address) { this.userId = userId; this.username = username; this.address = address; } } class UserIdComparator implements Comparator<User> { public int compare(User user1, User user2) { if (user1.userId == user2.userId) { return 0; } else if (user1.userId >…
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