CSE205 2026/2027 Final Examination Revision Package: Structured Quizzes, Past Papers, and Concept Review for Exam Success

2026/2027


CSE 205 2026/2027 Final Examination
Revision Package: Structured Quizzes, Past
Papers, and Concept Review for Exam
Success

Question 1: Method Overriding in Inheritance

To override a superclass method in a subclass, the subclass method must:

A. Use a different method name
B. Use the same method name and the same parameter types
C. Use a different method name and the same parameter types
D. Use a different method name and different parameter types

Correct Answer: B. Must use the same method name and the same parameter
types

Rationale:
Method overriding in Java requires that the subclass method has the exact same
method signature as the superclass method, including the method name and parameter
list. This ensures runtime polymorphism works correctly. Changing the name or
parameters results in method overloading, not overriding. Therefore, options A, C,
and D are incorrect because they violate the rules of inheritance-based method
overriding.


Question 2: Accessing Constants in Interfaces

Given the interface:

public interface Sizable {
int LARGE_CHANGE = 100;
void changeSize();
}

How should the constant be accessed in another class?

A. LARGE-CHANGE
B. Sizable.LARGE_CHANGE
C. Sizable(LARGE_CHANGE)
D. You cannot use it directly

Correct Answer: B. Sizable.LARGE_CHANGE

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Rationale:
Interface variables are implicitly public, static, and final. Therefore, they are accessed
using the interface name followed by the variable name. Option B is correct. The
other options are invalid syntax or incorrect assumptions about interface constants.


Question 3: Comparable Interface Error

public class BankAccount implements Comparable<BankAccount> {
public int compareTo(T other) {

What is the issue in this code?

A. Wrong interface type
B. Missing generic declaration
C. Incorrect compareTo parameter type
D. No error exists

Correct Answer: C. Incorrect compareTo parameter type

Rationale:
The compareTo method must match the type declared in Comparable. Since the class
uses Comparable<BankAccount>, compareTo must accept a BankAccount parameter.
Using a generic T causes a mismatch, leading to a compilation error.


Question 4: Properties of Interfaces

Which statement is true about Java interfaces?

A. Interfaces have methods and instance variables
B. Interfaces have methods but no instance variables
C. Interfaces have neither methods nor variables
D. Interfaces have instance variables but no methods

Correct Answer: B. Interfaces have methods but no instance variables

Rationale:
Interfaces define behavior through abstract methods and constants, but they do not
contain instance variables. This allows multiple classes to implement the same
behavior contract.


Question 5: Interface Method Requirement

Which statement about Java interfaces is NOT true?

A. Interfaces define required methods
B. Interfaces must contain more than one method

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C. Interfaces define behavior contracts
D. Methods are abstract by default

Correct Answer: B. Interfaces must contain more than one method

Rationale:
An interface can contain one or many methods. There is no requirement for multiple
methods, making option B incorrect.


Question 6: Generalized Interface Parameter

double measure(__________ anObject);

Which parameter allows all object types?

A. Class
B. Object
C. Any
D. Void

Correct Answer: B. Object

Rationale:
Using Object allows the method to accept any Java class since all classes inherit from
Object.


Question 7: Type Checking in Java

Which operator checks if an object belongs to a specific type?

A. this
B. subclassOf
C. instanceof
D. equals

Correct Answer: C. instanceof

Rationale:
The instanceof operator is used for runtime type checking in Java. The other options
are not valid Java type-checking constructs.


Question 8: Object Comparison

Which statement is correct?

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A. equals compares memory addresses
B. equals compares object content
C. == compares object content
D. equals and == behave the same

Correct Answer: B. equals compares object content

Rationale:
The equals method is used for logical equality (content), while == compares memory
references.


Question 9: Default toString Behavior

What happens if toString() is not overridden?

A. Returns object fields
B. Returns only object name
C. Returns class name + hash code
D. Compilation error

Correct Answer: C. Returns class name + hash code

Rationale:
The default Object.toString() method returns class name plus hashcode representation.


Question 10: Access Modifier – protected

Protected members can be accessed by:

A. Only the class itself
B. Any class
C. Same package + subclasses
D. Only subclasses in other packages

Correct Answer: C. Same package + subclasses

Rationale:
Protected allows access within the same package and by subclasses, even across
packages.


Question 11: Final Class Behavior

Which statement is FALSE about final classes?

A. Cannot be extended
B. Cannot be subclassed