[JAVA][BETA] Shows random Email ID combinations with using user's Name / DOB <3

EmailID_Generator.java

import java.util.*;
class EmailID_Generator
{
    String domainList[] = {"@outlook.com", "@gmail.com", "@icloud.com", "@rediffmail.com", "@hotmail.com", "@live.in", "@yahoo.co.in"};
    char valid_chars[] = {' ', '.', '!', '#', '$', '%', '&', '*',
            '+', '-', '/', '=', '?', '^', '_', '`', '|', '~',};
    void main()
    {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter name:");
        String name = sc.nextLine().toLowerCase().trim();
        System.out.println("Do you want to reflect the DOB in your generated Email IDs?(Y/N):-");
        char c = sc.next().charAt(0);
        c = Character.toLowerCase(c);
        switch (c)
        {
            case 'y':
                System.out.println("Enter DOB(DD/MM/YY):-");
                String DOB = sc.next().trim();
                emailid_gen_dob(name, DOB);
                break;
            case 'n':
                emailid_gen(name);
                break;
            default:
                System.err.println("Invalid Input");
                System.exit(0);
        }
    }
    void emailid_gen(String name)
    {
        int counter = 0;
        String parts[] = name.split("\\s"); // Considering a 2 word name. TODO: UNIVERSAL
        for (String domain : domainList)
        {
            for (char c : valid_chars)
            {
                System.out.println(parts[0] + (Character.isWhitespace(c) ? "" : c) +  parts[1] + domain);
                System.out.println(parts[1] + (Character.isWhitespace(c) ? "" : c) + parts[0] + domain);
                counter += 2;
            }
        }
        System.out.println("Total Generated Email IDs:- " + counter);
    }
    void emailid_gen_dob(String name, String DOB)
    {
        int counter = 0;
        String parts[] = name.split("\\s"); // Considering a 2 word name. TODO: UNIVERSAL
        String date_data[] = DOB.split("/");
        for (String domain : domainList)
        {
            for (char c : valid_chars)
            {
                System.out.println(parts[0] + (Character.isWhitespace(c) ? "" : c) +  parts[1] + domain);
                System.out.println(parts[0] + date_data[0] + (Character.isWhitespace(c) ? "" : c) +  parts[1] + domain);
                System.out.println(parts[0] + (Character.isWhitespace(c) ? "" : c) +  parts[1] + date_data[2] + domain);
                System.out.println(parts[0] + (Character.isWhitespace(c) ? "" : c) +  parts[1] + date_data[0] + date_data[1] + date_data[2] + domain);
                System.out.println(parts[0] + date_data[1] + date_data[2] + (Character.isWhitespace(c) ? "" : c) +  parts[1] + domain);
                System.out.println(parts[0] + date_data[2] + (Character.isWhitespace(c) ? "" : c) +  parts[1] + domain);
                System.out.println(parts[0] + date_data[2] + (Character.isWhitespace(c) ? "" : c) +  parts[1] + date_data[0] + date_data[1] + domain);
                System.out.println(parts[1] + (Character.isWhitespace(c) ? "" : c) + parts[0] + domain);
                System.out.println(parts[1] + date_data[0] + (Character.isWhitespace(c) ? "" : c) +  parts[0] + domain);
                System.out.println(parts[1] + (Character.isWhitespace(c) ? "" : c) +  parts[0] + date_data[2] + domain);
                System.out.println(parts[1] + (Character.isWhitespace(c) ? "" : c) +  parts[0] + date_data[0] + date_data[1] + date_data[2] + domain);
                System.out.println(parts[1] + date_data[1] + date_data[2] + (Character.isWhitespace(c) ? "" : c) +  parts[0] + domain);
                System.out.println(parts[1] + date_data[2] + (Character.isWhitespace(c) ? "" : c) +  parts[0] + domain);
                System.out.println(parts[1] + date_data[2] + (Character.isWhitespace(c) ? "" : c) +  parts[0] + date_data[0] + date_data[1] + domain);
                counter += 14;
            }
        }
        System.out.println("Total Generated Email IDs:- " + counter);
    }
}