CSE 205 Final Exam Practice Test (100 Questions
with Answers & Explanations) | Java OOP, Data
Structures, Algorithms Study Guide | INSTANT
PDF DOWNLOAD
Overview
This CSE 205 Final Exam Practice Test is a complete study resource designed to help students
master core concepts in Java programming, object-oriented programming (OOP), data
structures, and algorithms. It includes 100 exam-style multiple-choice questions with
detailed explanations, closely matching typical university final exam difficulty.
The practice set covers essential topics such as inheritance, polymorphism, encapsulation,
recursion, stacks, queues, linked lists, sorting algorithms, and Big-O time complexity,
helping students strengthen both conceptual understanding and problem-solving skills.
Ideal for last-minute revision or structured exam preparation, this guide simulates real exam
conditions and focuses on commonly tested questions in CSE 205 (Introduction to Data
Structures / Java Programming) courses.
What This Practice Test Covers
Object-Oriented Programming (OOP) concepts in Java
Inheritance, polymorphism, abstraction, and encapsulation
Data structures: arrays, stacks, queues, linked lists, trees, graphs
Algorithms and complexity analysis (Big-O notation)
Sorting and searching techniques
Recursion and function behavior
Java syntax, keywords, and program structure
1.
A Java program defines a class where all data fields are marked as private and accessed
only through public methods. Which object-oriented programming principle is being applied?
A. Inheritance
B. Encapsulation
,C. Polymorphism
D. Abstraction
✅ Answer: B. Encapsulation
Explanation:
Encapsulation hides internal data by making fields private and controlling access through
public methods, improving security and maintainability.
2.
A subclass in Java uses the extends keyword to inherit properties and methods from a
parent class. What concept does this demonstrate?
A. Method overloading
B. Inheritance
C. Runtime binding
D. Encapsulation
✅ Answer: B. Inheritance
Explanation:
Inheritance allows a class to reuse and extend functionality from another class.
3.
In Java, two methods in the same class share the same name but have different parameter
lists. What is this called?
A. Method overriding
B. Method overloading
C. Recursion
D. Polymorphic binding
✅ Answer: B. Method overloading
Explanation:
Overloading allows multiple methods with the same name but different parameters within
the same class.
,4.
Which data structure is most appropriate for implementing undo and redo functionality in
software applications?
A. Queue
B. Stack
C. Tree
D. Graph
✅ Answer: B. Stack
Explanation:
Stacks follow LIFO (Last In First Out), making them ideal for undo/redo operations.
5.
What keyword in Java is used to create a new object instance of a class?
A. create
B. object
C. new
D. init
✅ Answer: C. new
Explanation:
The new keyword allocates memory and creates an object.
6.
Which principle allows different classes to be treated as instances of the same parent type
while behaving differently at runtime?
A. Encapsulation
B. Polymorphism
C. Inheritance
D. Compilation
✅ Answer: B. Polymorphism
, Explanation:
Polymorphism enables one interface to represent multiple forms.
7.
What must always be present in a recursive function to prevent infinite execution?
A. Loop counter
B. Base case
C. Array index
D. Constructor
✅ Answer: B. Base case
Explanation:
The base case stops recursion when a condition is met.
8.
Which data structure provides constant time access (O(1)) to elements using an index?
A. Linked list
B. Stack
C. Array
D. Queue
✅ Answer: C. Array
Explanation:
Arrays allow direct memory access using indexing.
9.
What is the main advantage of using a linked list over an array?
A. Faster searching
B. Fixed memory size
C. Dynamic size allocation
D. Direct indexing
with Answers & Explanations) | Java OOP, Data
Structures, Algorithms Study Guide | INSTANT
PDF DOWNLOAD
Overview
This CSE 205 Final Exam Practice Test is a complete study resource designed to help students
master core concepts in Java programming, object-oriented programming (OOP), data
structures, and algorithms. It includes 100 exam-style multiple-choice questions with
detailed explanations, closely matching typical university final exam difficulty.
The practice set covers essential topics such as inheritance, polymorphism, encapsulation,
recursion, stacks, queues, linked lists, sorting algorithms, and Big-O time complexity,
helping students strengthen both conceptual understanding and problem-solving skills.
Ideal for last-minute revision or structured exam preparation, this guide simulates real exam
conditions and focuses on commonly tested questions in CSE 205 (Introduction to Data
Structures / Java Programming) courses.
What This Practice Test Covers
Object-Oriented Programming (OOP) concepts in Java
Inheritance, polymorphism, abstraction, and encapsulation
Data structures: arrays, stacks, queues, linked lists, trees, graphs
Algorithms and complexity analysis (Big-O notation)
Sorting and searching techniques
Recursion and function behavior
Java syntax, keywords, and program structure
1.
A Java program defines a class where all data fields are marked as private and accessed
only through public methods. Which object-oriented programming principle is being applied?
A. Inheritance
B. Encapsulation
,C. Polymorphism
D. Abstraction
✅ Answer: B. Encapsulation
Explanation:
Encapsulation hides internal data by making fields private and controlling access through
public methods, improving security and maintainability.
2.
A subclass in Java uses the extends keyword to inherit properties and methods from a
parent class. What concept does this demonstrate?
A. Method overloading
B. Inheritance
C. Runtime binding
D. Encapsulation
✅ Answer: B. Inheritance
Explanation:
Inheritance allows a class to reuse and extend functionality from another class.
3.
In Java, two methods in the same class share the same name but have different parameter
lists. What is this called?
A. Method overriding
B. Method overloading
C. Recursion
D. Polymorphic binding
✅ Answer: B. Method overloading
Explanation:
Overloading allows multiple methods with the same name but different parameters within
the same class.
,4.
Which data structure is most appropriate for implementing undo and redo functionality in
software applications?
A. Queue
B. Stack
C. Tree
D. Graph
✅ Answer: B. Stack
Explanation:
Stacks follow LIFO (Last In First Out), making them ideal for undo/redo operations.
5.
What keyword in Java is used to create a new object instance of a class?
A. create
B. object
C. new
D. init
✅ Answer: C. new
Explanation:
The new keyword allocates memory and creates an object.
6.
Which principle allows different classes to be treated as instances of the same parent type
while behaving differently at runtime?
A. Encapsulation
B. Polymorphism
C. Inheritance
D. Compilation
✅ Answer: B. Polymorphism
, Explanation:
Polymorphism enables one interface to represent multiple forms.
7.
What must always be present in a recursive function to prevent infinite execution?
A. Loop counter
B. Base case
C. Array index
D. Constructor
✅ Answer: B. Base case
Explanation:
The base case stops recursion when a condition is met.
8.
Which data structure provides constant time access (O(1)) to elements using an index?
A. Linked list
B. Stack
C. Array
D. Queue
✅ Answer: C. Array
Explanation:
Arrays allow direct memory access using indexing.
9.
What is the main advantage of using a linked list over an array?
A. Faster searching
B. Fixed memory size
C. Dynamic size allocation
D. Direct indexing
