Array of Concertgoer

Concertgoer.java

import java.util.Scanner;

public class Concertgoer {

	static Scanner sn = new Scanner( System.in );

	public static void main(String[] args) {

		String emoticon[] = new String[20];

		System.out.print("Enter number of concertgoers:" );
		int n = sn.nextInt();

		if( n < 20 ) {
			for( int i=0; i<n; i++ ) {
				System.out.printf("Enter concertgoers %d: ", i+1 );
				emoticon[i] = checkConcertgoer( sn.next(), i );
			}
			displayAllConcertgoer( emoticon );
		}
		else 
			System.out.println("Number of concertgoers exceeded.");
	}

	private static String checkConcertgoer(String str, int i) {
		if( str.contains( ":" ) ) {
			return str;
		}
		else {
			System.out.println("Invalid!" );
			System.out.printf("Enter concertgoers: %d: ", i+1 );
			checkConcertgoer( sn.next(), i );
		}
		return "";
	}

	public static void displayAllConcertgoer( String[] arr ) {
		System.out.println("\n\nList of Concertgoers:");
		for(int i=0; i<arr.length; i++) {
			if( arr[i] != null ) {
				System.out.printf( "%nConcertgoer %d: %s ", i+1, arr[i] );
			}
		}
	}
}