Summary Flashcards OOP

Question 1

Encapsulation is

Answer 1

the process of combining data and methods in single unit

Question 2

Abstraction

Answer 2

is to hide the complexity of the program , hides the unnecessary details from the user using classes

Question 3

inheritance

Answer 3

allows creating hierarchy of related classes, allows code reusability

Question 4

polymorphism

Answer 4

same concept can have different meanings in different contexts has to form overloading and overridding

Question 5

classes reserves memory?

Answer 5

nope

Question 6

composition is

Answer 6

make an object

Question 7

inheritance

Answer 7

extend a class

Question 8

you can not inherit

Answer 8

final methods/ fields
attribute methods/ fields
private methods/ fields
constructors

Question 9

constructors and static can not be abstract?

Answer 9

true, as they can not be inherited and for static its for the whole class cannot be overridden

Question 10

parameters in methods passes by value unless

Answer 10

unless it passes objects or strings

Question 11

assigning subclass to a superclass can be?

Answer 11

nope , you can’t assign subclass to superclass

Question 12

a class must have a …

Answer 12

constructor

Question 13

for each syntax

Answer 13

for (int item:arr) { System.out.println(item); }

Question 14

arrays holds … (values/references)

Answer 14

references