Generates a username based off of the first letter of your name, the first 5 letters of your last name, and a random 2 digit number.

Usernames.java

import java.util.*;
 
public class Usernames {
 
     public static void main(String[] args) {
        
        String first, last, username;
		int randomNum;
        
		// Scan in first and last name
        Scanner scan = new Scanner(System.in);
		first = scan.next();
        last = scan.next();
        
        // Create random number 10-99
		// add 10 so the lowest number generated is 10
		// randomize 90 numbers because 0 counts as a number
        Random generator = new Random();
        randomNum = generator.nextInt(90) + 10;
        
        // Display custom username
        username = first.charAt(0) + last.substring(0, 5) + randomNum;
        System.out.println(username);
     }
}