Question

Write a simple program that reads from the console a sequence of usernames and keeps a collection with only the unique ones.

Print the collection on the console in order of insertion:

Input	Output
6 Ivan Ivan Ivan SemoMastikata Ivan Hubaviq1234	Ivan SemoMastikata Hubaviq1234

 

Answer 1

Here's my solution:

import java.util.LinkedHashSet;
import java.util.Scanner;

public class Pr_01_UniqueUsernames {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();
        LinkedHashSet<String> set = new LinkedHashSet<>();
        String input = sc.nextLine();

        for (int i = 0; i < n; i++) {
            input = sc.nextLine();
            set.add(input);
        }

        for (String s : set) {
            System.out.println(s);
        }
    }
}