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Understanding CriteriaQuery

Chris Ramacciotti , first of all, thanks for the great content! :)

Could you please explain what this code exactly does and how can we "fit" it in what we have learned 'til now?

for instance...why are we passing twice the class? third line is quite clear, but 2 firsts ones are...blurred.

Thank you!

``` // UPDATED: Create CriteriaQuery CriteriaQuery<Contact> criteria = builder.createQuery(Contact.class);

// UPDATED: Specify criteria root

// UPDATED: Execute query
List<Contact> contacts = session.createQuery(criteria).getResultList();