UsernameGenerator.java

import java.util.Scanner;
import java.util.Random;

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

    //Scanner & random & int
    Scanner input = new Scanner (System.in);

    //Random number generator build
    Random generator = new Random();
    int num1;

    //Random number in the range 10 to 99
    num1 = generator.nextInt((90)+10);
    Random rnd = new Random();

      //String object
      String firstName;
      String lastName;
      String concatenatedName;

      //Get First & Last names
      System.out.print("First Name:");
      firstName = input.next();
      System.out.print("Last Name:");
      lastName = input.next();

      //String of the first four characters of the user's last names
      //String of the first two letters of the user's first names
      concatenatedName = lastName.substring(0,4) + firstName.substring(0,2) + num1;
        System.out.println(concatenatedName);
            }
  }