oop

Question 1

public classes cannot be altered

Answer 1

false, they can be altered outside of it’s class.
private: you can only alter it in it’s class, never outside

Question 2

when you don’t intialize the class as public or private, it well assume by default that it is:

Answer 2

public

Question 3

the default value that java will give a public numeric variable:

Answer 3

0

Question 4

the default value that java will give a public char/string:

Answer 4

null

Question 5

the default value that java will give a public boolean variable:

Answer 5

false

Question 6

T/F: we can access attributes inside an object by the name of object and dot (period) (access member)

Answer 6

true

Question 7

To use an object from another class it must be in the same ________

Answer 7

folder

Question 8

public void setTime(int h , int m, int s)
we call this:

Answer 8

setter (Mutator)

Question 9

public int getSec(){
return sec;
}
we call this:

Answer 9

getter (Accessors)

Question 10

a constructor with empty paranthesis is called

Answer 10

parametrized constructor

Question 11

when i don’t have any constructor in my class and java makes/gives me a constructor

Answer 11

default constuctor

Question 12

T/F: java conducts a defaults constuctor if my code doesn’t have a constructor.

Answer 12

true.

Question 13

UML stands for

Answer 13

unified model language

Question 14

the UML is composed in three parts:

Answer 14

1) the name of the class,
2) the names of the variables, their type and whether they are public (+) or private (-),
3) and lastly the methods, their names next to it’s type

Question 15

T/F: A constructor is always public.

Answer 15

true

Question 16

T/F: the name of the constructor can be different from the name of the class.

Answer 16

false, it’s always the same as class

Question 17

T/F: A constructor is not void, but does return a value.

Answer 17

false, it’s not void and does not return a value.

Question 18

T/F: there can be more than one constructor in an overload.

Answer 18

true

Question 19

T/F: you must call out a constructor.

Answer 19

false, a constructor does not need to be called to performed.

Question 20

what does this( ) do?

Answer 20

calling to another constructor within the same class

Question 21

which kind of copy is this?
Clock c4 = new Clock ( c2 );

Answer 21

deep copy (composetion)

Question 22

which kind of copy is this?
Clock c5 = c2;

Answer 22

shallow copy (Agregation)

Question 23

a parameterized constructor

Answer 23

a constructor with different set values for the objects

Question 24

default constructor

Answer 24

no values set for the objects within the constructor

Question 25

Constructor Overloading in Java

Answer 25

is a technique of having more than one constructor with different parameter lists

Question 26

T/F: In Java, a constructor is just like a method but without return type.

Answer 26

true

Question 27

a method header includes:

Answer 27

access specifier (public/private), return type (int/double/etc), method name, parameter list

Question 28

method signature:

Answer 28

It includes the method name and parameter list.

Question 29

the method this. is a (accessor/mutator) method?

Answer 29

mutator

Question 30

the method return is a (accessor/mutator) method?

Answer 30

accessor