unit 9

Question 1

t/f: all getter methods have return types of void

Answer 1

false, though true for setter methods

Question 2

what does the capital E stand for in the java quick reference?

Answer 2

object type

Question 3

overridden method

Answer 3

subclass has same method name AND parameter list, but method does not call exact same thing as in parent class

Question 4

when is super NOT super.?

Answer 4

in the constructor, just super()

Question 5

what do you inherit?

Answer 5

everything PUBLIC

Question 6

does return type matter in overloading?

Answer 6

nah

Question 7

true/false: super must always be the first statement in a constructor

Answer 7

true

Question 8

does the statement compile:
Statue eTanseer = new Gargoyle(“eshan”);

where gargoyle is a subclass of statue?

Answer 8

ye

Question 9

when is super() implemented?

Answer 9

1. in a constructor, when you have private variables/fields in the superclass which you want to initialize
2. automatically/implicity, when a class has a parent class

Question 10

what happens if super is not explicitly called and the superclass has no no-args constuctor?

Answer 10

compile error

Question 11

are constructors inherited?

Answer 11

NO, thats why we use super and java calls super if you dont

Question 12

when is super called automatically/invisibly?

Answer 12

ONLY in constructors

Question 13

in the body of a class you have access to….

Answer 13

all the fields within that class

Question 14

to override an object method…

Answer 14

you must use type Object as a parameter

same thing with anything else being overriden, must have same object as for method being overriden (i think?)

Question 15

what is an abstract class

Answer 15

a class that cannot and should not be instantiated (think pet, cant create a pet w/o subclass)

Question 16

what happens when you declare a subclass object as the type of a superclass?

ex.

statue Eshan = new Gargoyle();

Question 17

annotate your questions with arrows showing left to right or right to left and columns and rows and such

Question 18

why dont subclasses inherit constructors, even though theyre public?

Answer 18

because it must have the same header, and as theyre different classes and constructors are based on class headers, they literally cant have the same constructor header

Question 19

when does java create an automatic no args constructor?

Answer 19

ONLY when the superclass/class DOES NOT ALREADY have a constructor

Question 20

How to override method

Answer 20

To override an inherited method, the method in the child class must have the same name, parameter list, and return type (or a subclass of the return type) as the parent method. Any method that is called must be defined within its own class or its superclass.

Question 21

if a inherits from b, b inherits crom c, and c inherits from d, check ANY that are true
1. a is the grandparent of b, c, and d
2. d is derived from b
3. b may use public methods that are declared in c
4. c may use public methods that are declared in a
5. a may use public meths that are declared in d

Answer 21

3 and 5