12. Exercise: JShell

Run JShell by typing jshell from the command line

Create a new variable using the var keyword and assign it a String value.

Create another variable using the var keyword and assign it the value of List.of(1,2,3).

Use /vars to inspect the types of your created variables.

Try to cast the List you created to an ArrayList.

Start Jshell using the command:jshell --class-path /path/to/validator.jar

Import the packages from the jar so you can use them in Jshell. For example:

import com.udacity.domain.*;
import com.udacity.validator.strategies.*;

Try using classes from the Jar. For example:

new PhoneCheck().validateUser(new User("user@validemail.com", "123123123"))