What is the purpose of the keyword this?

this signifies instance variables belonging to the object

What does the keyword public signify?

any other classes may access that entity

What does the keyword static mean?

There is only one copy for all of the running code

Classes contain 3 things. These are...

instance variables, constructors, and methods

An accessor method...

provides a consistent method to access instance variables

Why are wrapper classes needed?

To provide conversion from one type to another, To allow primitive types to be treated like class types

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Object Oriented Concepts

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A quiz about Object Oriented Programming concepts for APCS!

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Questions 16

Answers

1
What is the purpose of the keyword this?
this signifies a helper method in a class
this signifies instance variables belonging to the object
this signifies an accessor method
this signifies a constructor
2
What does the keyword public signify?
other objects of the same type may access that entity only
only objects in the same folder may access that entity
any other classes may access that entity
no other objects my access that entity
3
What does the keyword static mean?
The code runs when play is pressed in Eclipse
The method does not change
There is only one copy for all of the running code
The variable does not change
4
The fact that the class Animal contains information about one single animal is an example of...
Information Hiding
A Constructor
Encapsulation
Abstraction
5
All instance variables should have a visibility of
protected
private
public
inherited
6
Classes contain 3 things. These are...
instance variables, a main method, static variables
instance variables, constructors, and methods
instance variables, comments, and constructors
a toString method, a constructor, and other methods
7
Using visibility modifiers in classes is an example of...
instance variables
encapsulation
inheritance
information hiding
8
Which is an example of a wrapper class?
Scanner
String
boolean
Integer
9
An accessor method...
provides access to a constructor of a class
allows another class to call a specific method
provides a consistent method to access instance variables
allows a class to be instantiated
10
A program that uses a specific class is called a __________ of that class.
user
mutator
constructor
client
11
After running the code String a; what will a store?
the empty String ""
nothing; an error will occur
the letter 'a'
null
12
A mutator method...
does nothing within a class
prints out to the screen
changes the state of an object
returns a private instance variable
13
Why are wrapper classes needed?
There is no need for them
To allow class types to be treated like primitive types
To provide conversion from one type to another
To allow primitive types to be treated like class types
14
The code to create a new object is called a ...
Method
Constructor
Instance Variable
Class
15
Which is an example of a primitive type?
boolean
Person
String
Scanner
16
To create a new variable of type Animal you would use the code
Animal = new Animal();
Animal a = new Animal();
a = new Animal();
Animal a = Animal();

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