how do i catch Exception

if i ask for a string through bufferReader i.e
a telephone number 5554444
how can i stop a letter being entered instead of a number

thanks

Not directly. You could read character per character and check each one. Or you could use a read-integer function (don't know if there is one), but it wouldn't hinder the user from entering a letter, it would only make the function throw an exception.

thanks i will check that way out

or u can put the string u get into Integer.parseInt(String s)

if this can't make it into an integer it throws an exception