java - Generating username with given information from the user -

hi im can me program ? professor ask program information user , generate 6 letter username lastname , firstname of user. first 3 letters of user name first 3 letters of firstname , other 3 last 3 letters of lastname of user. , need test log-in module test if username , password match on generated username , user inputted password

as far im doing cant find answer on , our professor didn't teach this , im struggling right now.

this program right now>>>

public static inputstreamreader r = new inputstreamreader(system.in); public static bufferedreader = new bufferedreader(r);  public static void main(string[]args) throws exception{      string lname,fname,mi;     int age,bday;     float pass;      system.out.print("enter last name: ");     lname=i.readline();     system.out.print("enter first name: ");     fname=i.readline();     system.out.print("enter middle name: ");     mi=i.readline();     system.out.print("age: ");     age=integer.parseint(i.readline());     system.out.print("birthday (mm/dd/yy) :");     bday=integer.parseint(i.readline());     system.out.println("password must 4-6 digit combination");     system.out.print("enter password : ");     pass=float.parsefloat(i.readline());      system.out.println("please wait while generating username");     for(int j=0;j<=35;j++)     {             try{                 thread.sleep(100);             }             catch(interruptedexception ex)             {                 //do nothing             }             system.out.print("*");     }   } 

can me please....

you can just:

string username = fname.substring(0,3) + lname.substring(lname.length() - 3, lname.length()); 

you should check fname , lname have minimum length of 3 characters, or exception