What is the default accessibility scope for classes, methods, and properties?

Package-private or package access

What do objects created from a subclass inherit?

Properties of the superclass, Unique characteristics of the subclass

What is the difference between a CSV file and a text file?

CSV uses comma separators, text uses various separators

What is an association relationship?

Class A uses/references Class B

What is the purpose of the try block in exception handling?

To specify code that may throw an exception

What is the difference between an ArrayList and an array?

Array of objects vs array of primitives

What is the difference between a class and an object?

A class is a blueprint, while an object is an instance of a class

What are the features of Object-Oriented Programming (OOP)?

Encapsulation, Abstraction, Polymorphism, Inheritance

How can you print the elements of an array in Java?

for(int i=0; i<=currentPosition; i++) System.out.println(studentName[i])

What is the purpose of an interface in Java?

Creating contracts in OO program

What are the classes and interfaces in the java.io package used for?

Getting file and directory information

What are the types of relationships in UML?

Association, Aggregation, Composition

What is the purpose of a test plan?

Ensure system does not contain errors

What is an aggregation relationship?

Class A has Class B as a property

What are the features of Object-Oriented Programming (OOP)?

Encapsulation, Abstraction, Polymorphism, Inheritance

What is the difference between a class and an object in Java?

A class is a blueprint, while an object is an instance of a class

What are the features of Object Oriented Programming?

Inheritance, Encapsulation, Polymorphism, Abstraction

What is the purpose of unit testing?

Examine small 'unit' of application

What is the purpose of Javadoc?

Inspect source-level structures and API comments

What is the purpose of polymorphism in Java?

To write programs that process objects of different types

How can you create an array in Java?

String studentName[] = new String[100]

What does an interface tell us about an object?

What we can do with the object and how to do it

What is the relationship between a superclass and a subclass in inheritance?

The subclass inherits the attributes and methods of the superclass

What is encapsulation achieved through?

Declaring class variables as private

What is a class diagram in UML?

Visual representation of classes

What is the purpose of the throw keyword in exception handling?

To throw an exception for a method

What must be done if a class includes abstract methods?

The class itself must be declared abstract

What is the purpose of the main method in Java?

To create objects and start the program

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CST8132 OOP

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Questions 86

Answers

1
Is JUnit a facility for automated unit testing?
True
False
2
What is the default accessibility scope for classes, methods, and properties?
Accessible in same package
Accessible from any c
Accessible only within host class
Package-private or package access
3
What do objects created from a subclass inherit?
Methods of the superclass
Properties of the superclass
Data fields of the superclass
Unique characteristics of the subclass
4
What is a composition relationship?
Class A uses/references Class B
Class A is a part of Class B
Whole/Part relationship
Class A has Class B as a property
5
What is the difference between a CSV file and a text file?
CSV uses various separators, text uses comma separators
CSV uses comma separators, text uses various separators
CSV uses colon separators, text uses semicolon separators
CSV uses semicolon separators, text uses colon separators
6
What is an association relationship?
Class A uses/references Class B
Class A has Class B as a property
Class A is a kind of Class B
Class A is a part of Class B
7
What is the purpose of the try block in exception handling?
To specify code that may throw an exception
To handle specific exceptions
To release resources
To catch errors
8
What is the purpose of packages in Java?
Group related classes together
Provide access/protection layer
Avoid naming conflicts
Contain sub packages
9
Is encapsulation a feature of object-oriented programming?
False
True
10
What is the difference between an ArrayList and an array?
Dynamic size vs fixed size
Array of objects vs array of primitives
Array indices vs array boundaries
Holds actual values vs holds references
11
What is the difference between a class and an object?
A class is an object, while an object is a blueprint
A class is a blueprint, while an object is an instance of a class
A class and an object are the same thing
A class is a method, while an object is a variable
12
What are the features of Object-Oriented Programming (OOP)?
Relational, Logical, Arithmetic, Compound Assignment
Standard Output, System.out.print(), System.out.println()
Length, Width, Height
Encapsulation, Abstraction, Polymorphism, Inheritance
13
How can you print the elements of an array in Java?
for (String s: studentName) System.out.println(s)
for(int i=0; i<=currentPosition; i++) System.out.println(studentName[i])
System.out.println(studentName)
System.out.println(studentName.toString())
14
What are the uses of UML?
Implement complete design
Auto-generate code structure
Communicate system aspects
Create UML after coding
15
How can you write a text file in Java?
Using the Files class
Using the Paths class
Using the Scanner class
Using the Formatter class
16
What is the purpose of an interface in Java?
Implementing abstract methods
Hiding implementation details
Inheriting from another class
Creating contracts in OO program
17
True or False: The main method is always static in Java.
False
True
18
What are the classes and interfaces in the java.io package used for?
Manipulating files and directories
Reading and writing objects
Creating, copying, and deleting files
Getting file and directory information
19
What is the purpose of the catch block in exception handling?
To handle specific exceptions
To declare exceptions
To release resources
To catch errors
20
What is the purpose of the finally block in exception handling?
To declare exceptions
To catch exceptions
To release resources
To handle errors
21
What is UML?
General-purpose language
Programming language
Modeling language
Developmental language
22
What are the types of relationships in UML?
Association, Aggregation, Composition
Import, Export, Reference
Inheritance, Generalization
Sketch, Blueprint, Programming
23
Is UML a general-purpose developmental modeling language?
True
False
24
What is the maximum number of superclasses a class can extend in Java?
One
Two
Unlimited
Three
25
What are the branching control structures in Java?
while, do-while, for
< > == != <= >=
if, if-else, switch
+, -, *, /
26
What is the purpose of abstraction in Java?
Providing functionality to the user
Hiding implementation details
Showing implementation details
Creating abstract classes
27
What is the purpose of a constructor in a class?
To define objects of the same type
To hide sensitive data
To access and update the value of a private variable
To create a new object
28
What is the purpose of a test plan?
Ensure system compliance
Test individual units of program
Ensure system does not contain errors
Evaluate system's compliance
29
What is an aggregation relationship?
Class A is a kind of Class B
Class A uses/references Class B
Class A has Class B as a property
Class A is a part of Class B
30
What are the features of Object-Oriented Programming (OOP)?
Encapsulation, Abstraction, Polymorphism, Inheritance
Relational, Logical, Arithmetic, Compound Assignment
Length, Width, Height
Standard Output, System.out.print(), System.out.println()
31
What is JUnit used for?
Acceptance testing
Functional testing
Automated unit testing
Integration testing
32
What is an example of a checked exception?
NullPointerException
IOException
ArrayIndexOutOfBoundsException
ArithmeticException
33
What is the difference between a class and an object in Java?
A class is used for inheritance, while an object is used for encapsulation
A class is an object, while an object is a blueprint
There is no difference, they are the same thing
A class is a blueprint, while an object is an instance of a class
34
What does the term 'polymorphism' mean in Java?
Writing programs to objects of the same type
Getting input from the user
Holding references to multiple interfaces
Existing in many forms
35
What are the features of Object Oriented Programming?
Inheritance
Encapsulation
Polymorphism
Abstraction
36
What is the purpose of unit testing?
Test overall system behavior
Test integration between components
Evaluate system's compliance with business requirements
Examine small 'unit' of application
37
What is the difference between Overloading and Overriding?
Different method signatures
Inherit method in subclass
Methods with same name
Customize method in subclass
38
What is a computer file?
Data storage unit
Variable and array
Byte-based stream
Character-based stream
39
What is the purpose of Javadoc?
Inspect API comments
Inspect source-level structures and API comments
Inspect source-level structures
Generate web-based documentation
40
What is the purpose of polymorphism in Java?
To boost programmer productivity
To implement encapsulation
To write programs that process objects of different types
To create new software
41
How can you create an array in Java?
String studentName[] = new String[100]
String[] studentName = new String[100]
List<String> studentName = new ArrayList<>()
List <String> studentName = new ArrayList<>
42
What does an interface tell us about an object?
The implementation details of the object
What we can do with the object and how to do it
The return values of the object's methods
The object's method signatures
43
What kind of data is stored in a computer file?
Various types of data
Path and directory data
Byte and character data
Input and output data
44
What is the relationship between a superclass and a subclass in inheritance?
The superclass and subclass have the same attributes and methods
The superclass inherits the attributes and methods of the subclass
The superclass and subclass have no relationship
The subclass inherits the attributes and methods of the superclass
45
What is the purpose of the finally block in exception handling?
To declare exceptions
To handle errors
To catch exceptions
To release resources
46
What is encapsulation achieved through?
Creating objects of the same type
Declaring class variables as private
Performing operations on data
Defining objects with distinct states and behaviors
47
What is a class diagram in UML?
Visual representation of methods
Visual representation of attributes
Visual representation of classes
Visual representation of relationships
48
What is the keyword used to make a class inherit from another class?
extends
inherits
implements
extends superclass
49
What is the purpose of the throw keyword in exception handling?
To throw an exception for a method
To declare exceptions
To catch exceptions
To indicate what exception types may be thrown by a method
50
What must be done if a class includes abstract methods?
The class must be subclassed
The class itself must be declared abstract
The class must be instantiated
The class must hide implementation details
51
What is the purpose of the main method in Java?
To perform arithmetic operations
To create objects and start the program
To print output
To declare variables
52
What is an example of an unchecked exception?
ArrayIndexOutOfBoundsException
IOException
NullPointerException
ArithmeticException
53
What is the purpose of integration testing?
Test integration between components
Evaluate system's compliance with business requirements
Test overall system behavior
Test individual units of program
54
What are the relational operators in Java?
++ --
< > == != <= >=
+ - * / % += -= *= /= %-
&& ||
55
How does Java implement encapsulation?
By using the keyword 'extends'
By hiding data and methods within a class
By creating new software
By reusing well-tested classes
56
What is inheritance in object-oriented programming?
A form of is-a relationship
A construct to define objects of the same type
A method type called a constructor
A way to hide sensitive data
57
What is an abstract class in Java?
A class that hides implementation details
A class that can be instantiated
A class that may or may not include abstract methods
A class that cannot be subclassed
58
What is the purpose of abstraction in Object Oriented Programming?
To find commonalities between different objects
To define a portable application
To hide details of an object from other objects
To make programming easier
59
What is the purpose of an array in Java?
To hold a specified number of values of a single data type
To perform arithmetic operations
To print output
To create objects
60
Does an abstract class in Java allow the user to see the implementation details?
True
False
61
What is the relationship between a superclass and a subclass?
Polymorphism relationship
Is-a relationship
Inheritance relationship
Has-a relationship
62
Is the finally block always executed when the try block exits?
False
True
63
Is encapsulation a feature of object-oriented programming?
True
False
64
What are the features of Object Oriented Programming?
Inheritance
Polymorphism
Encapsulation
Abstraction
65
How do you write Javadoc comments?
Enclosed by /** and */
Begin with /** and end with */
Descriptive text and tagged descriptors
Immediately above the code
66
What does UML stand for?
Unified Modeling Language
Software interfaces
Visual representation of relationships
High-level concepts in domain
67
What is the starting point for Java programs?
The Eclipse IDE
The main method
The Object Class
The Person Class
68
What is the purpose of the main method in Java?
To perform arithmetic operations
To print output
To declare variables
To create objects and start the program
69
What is the purpose of inheritance in Java?
Boost programmer productivity
Create new software
Implement encapsulation
Reuse code and avoid redundancy
70
Is a computer file different from a variable and array?
False
True
71
Does Java implement Encapsulation by using two ways?
False
True
72
What are 2 basic types of computer files?
Input and output
Byte and character
Path and directory
Text and binary
73
True or False: The main method is always static in Java.
True
False
74
How can you insert an element at the beginning of an array in Java?
studentNames.add("John")
studentNames[0].add("John")
studentNames[0]="John"
studentNames.add(0, "John")
75
What does each file represent in Java?
Stream of bytes
Stream of characters
Stream of objects
Stream of data
76
How is a computer file different from a variable and array?
Character-based stream
Byte-based stream
Data storage unit
Input and output data
77
What is the difference between a class and an object in Java?
There is no difference, they are the same thing
A class is used for inheritance, while an object is used for encapsulation
A class is a blueprint, while an object is an instance of a class
A class is an object, while an object is a blueprint
78
How can you read a CSV file in Java?
Using the Scanner class
Using the Paths class
Using the Files class
Using the Formatter class
79
True or False: The length of an array in Java can be changed after it is initialized.
True
False
80
What is a class in object-oriented programming?
A way to hide sensitive data
A method type called a constructor
A construct to define objects of the same type
A template for creating objects
81
What is the access modifier that allows everyone to have access to a member?
Protected
Private
Public
Package
82
What is the purpose of using a scanner in Java?
To get input from the user
To boost programmer productivity
To create new software
To implement encapsulation
83
What is the purpose of encapsulation in Object Oriented Programming?
To define a portable application
To make programming easier
To create reusable programs
To hide details of an object from other objects
84
What is the purpose of UML?
Documentation
Visualize system design
Brainstorming
Code generation
85
What is the purpose of the throws keyword in exception handling?
To catch exceptions
To throw an exception for a method
To indicate what exception types may be thrown by a method
To declare exceptions
86
What is encapsulation?
Creating objects of the same type
Performing operations on data
Hiding data from external users
Defining objects with distinct states and behaviors

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