Create a Java class and name it Driver or Tester.

Include a main method public static void main(String[] args) {}

Add Customer customer = new Customer("first", "second", "j@domain.com");

Next line AddSystem.out.println(customer); Note: If you have overridden the toString() method for the Customer class, this line will display the class contents

Add Customer customer = new Customer("first", "second", "email");

Run the driver program by right-clicking and selecting Run

An IllegalArgumentException should have been thrown because the String email does not match our regular expression for email, name@domain.com