#6 inheritance + cmsc131 review

Question 1

object class

Answer 1

super class of all classes

Question 2

2 methods of the object class

Answer 2

equals()

toString()

Question 3

what does default toString() do?

Answer 3

returns the address of the object

Question 4

composition

Answer 4

a class contains another object as a field (has_a relationship) generally favor composition to inheritance
(a car has_a engine)

Question 5

interface

Answer 5

> hold non-implemented method signatures
can have default and static methods
classes that implement an interface must implement all of its methods
what can a reference of an interface refer to?