How to Design Console Base Login Application in Java

Program 1

import java.io.*;
import java.util.Scanner;
class TestLogin
{
    public static void main(String args[])
    {
        String user,pass;
        char ch[];
        Console c=System.console();
          //System.out.println("Enter User Name: ");
          user=c.readLine("Enter User Name:");
         //System.out.println("Enter Password: ");
          ch=c.readPassword("Enter Password: ");
          pass=new String(ch);
        if(user.equalsIgnoreCase("vivek")  && pass.equals("indore"))
       { 
            Scanner scan=new Scanner(System.in);
             int choice;
         do
        {    
           System.out.println("-----------------Menu Application----------------------"); 
           System.out.println(" 1.Factorial \n 2.Reverse of Number\n 3.Addition of Number\n 4.Exit");
           System.out.println("----------------------------------------------------------"); 
          
           choice=scan.nextInt();
           switch(choice)
           {
            case 1: 
                   System.out.println("This is program for factorial ");break;
            case 2: 
                   System.out.println("This is program for reverse ");break;
             case 3: 
                   System.out.println("This is program for Addtion ");break;      
              case 4:break;     
           }
         }while(choice!=4);   

        //  System.out.println("User Name: " +user);
        //  System.out.println("Password: " +pass);
    }
    else
      System.out.println("Invalid user id or password");
 }  
}
/*
  String  readLine()
  String  readLine(String format)
  String  readPassword()
  String  readPassword(String format)
*/