hi,

i need some help in implementing validation to my program;

the program prompts the user to enter the details and error message is displayed if a wrong input is entered. The user is then prompted to enter the correct information again. I just need some help with 3 validation methods;

//able to enter only alphabets and / only
System.out.print("Enter user name: " );
user.name = input.readLine();

While{}

//must be ONLY 'A' or 'B'
System.out.print("Enter user prefix (A/B): ");
String prf = input.readLine();
user.prefix= prf.charAt(0);

While{}

//able to enter only alpha-numeric
System.out.print("Enter user address: ");
user.address = input.readLine();

While{}

Really appreciate of someone could help me with the conditions for this validation process..

Thanks!!