When imported the ArrayList utility on my project, the ArrayList functionalities won't work

Preconditions:

Creaed a project : Records

Package : martin.vangenderen

Two Java Classes created : Main and Records

In Main class, i have imported the ArrayList utility to practice with the subject of ArrayList.

Whenever i want activate the submethods of the ArrayList e.g :

System.out.println((i) + " City : " + contact.get(i).getCity());

The output is : The first name in the list is martin.vangenderen.com.Contact@42d80b78

Or another program:

Three classes: Main, MobilePhone, Contacts

MobilePhone has the ArrayList utility

Class Çontact' has returns a record of type Contact 

My code :

if (findContact(contact.getName())) 

The result is an underlining error, displaying :

findContact(martinvangenderen.Contact) in MobilePhone cannot be applied to (Java.lang.String)

Another program, from a tutorial, also using ArrayList works perfectly. I cannot see the difference.

Thanks in advance for your support.

Kind regards, Martin.