include $2$ methods:

validateHandle $()$: accepts the entered handle and returns true if it is a valid handle

validatePassword $()$: accepts the entered password and returns true if it is a valid

password

Sample output $1$:

Enter your handle:

Al$.$

Invalid handle, enter another:

Alexa?

Invalid handle, enter another:

Alexa

Create a password:

heyGoogle!

Account created successfully.

Sample output $2$:

Enter your handle:

lord voldemort

Invalid handle, enter another:

voldy

Create a password:

avadakadavra

Invalid password, enter another:

let's see does this work

Invalid password, enter another:

thislshouldwork#

Account created successfully.

IMPORTAN NOTE!!!: Do not use import.util.regex.$*$