Collections: Equality contract

Class Person represents selected attributes of real entity

• Instant created represents a timestamp when instance was created
• String name represents full name of a person
• Integer age represents age of a person
• Address address represent current address where person is living at

Implement equality contract for class Person

• Two instances of Person class are equal if and only if their fields are equal: name, age, address

Implement equality contract for class Address

• Two instances of Address class are equal if and only if their fields are equal: street, city.