What is the result of attempting to cast an object to a class that it does not inherit from?

2 Mark(s)

Compile-time error
) Run-time exception
It will return null
It will create a new instance

Which of the following is a feature of Java’s garbage collection?

2 Mark(s)

Manual memory management
Automatic memory management
Explicit memory allocation
None of the above

What does the `final` keyword signify when used with a class?

2 Mark(s)

The class can be subclassed
The class cannot be subclassed
The class can only have one constructor
The class is abstract

How can you achieve polymorphism in JaVA

2 Mark(s)

) By method overloading only
By method overriding only
By both method overloading and overriding
By using final classes

Which of the following keywords allows a class to inherit from an interface?

2 Mark(s)

Extends
implements
inherits
uses

What is the purpose of the `instanceof` operator in JaVA

2 Mark(s)

To check the type of an object
To create an instance of a class
To cast an object to a different type
To compare two objects

Which of the following statements is true about multiple inheritance in JAVA

2 Mark(s)

A class can implement multiple interfaces
A class can extend multiple classes
A class can inherit from multiple abstract classes
Multiple inheritance is allowed for classes and interfaces

What is the visibility of private attributes in Java?

2 Mark(s)

) Accessible from anywhere
Accessible only within the same class
Accessible from subclasses
Accessible within its own package

In Java, what is the visibility of a protected attribute?

2 Mark(s)

Accessible only within its own package
Accessible only within subclasses
Accessible within its own package and subclasses
Accessible from anywhere

Which of the following is true about the Object class in Java?

2 Mark(s)

All classes inherit from Object
Object class cannot be subclassed
Object class provides no methods
Object class has no constructors

Why is it important to override the `hashCode()` method when overriding `equals()`?

2 Mark(s)

To ensure unique object identity
To maintain the general contract for hash tables
To optimize memory usage
To allow method overloading

In Java, what is the result of attempting to instantiate an abstract class?

2 Mark(s)

Compile-time error
Run-time error
It creates an instance of the abstract class
) It calls the constructor of the abstract class

Which method can be used to create a deep copy of an object?

2 Mark(s)

Cloneable interface
Serialization
Copy constructor
All of the above

When a class inherits from an interface, which of the following must be implemented?

2 Mark(s)

Only abstract methods
Only non-abstract methods
Both abstract and non-abstract methods
Only static methods

Which method in Java is called when an object is deserialized?

2 Mark(s)

finalize()
readObject()
deserialize()
init()

What is the default visibility of a class member declared without any access modifier?

2 Mark(s)

Public
Protected
Private
Package-private

What is the purpose of the `clone()` method?

2 Mark(s)

To create a new instance of a class
To create a shallow copy of an object
To compare two objects
To serialize an object

. Which of the following keywords is used to declare an inner class?

2 Mark(s)

inner
static
public
class

Which of the following statements about multiple inheritance of interfaces is true?

2 Mark(s)

It is allowed in Java
It is not allowed in Java
It leads to ambiguity
) Only one interface can be inherited

How do you prevent a method from being overridden in a subclass?

A) Declare it as final
B) Declare it as private
C) Declare it as static
D) Declare it as abstract

2 Mark(s)

Declare it as final
Declare it as private
Declare it as static
) Declare it as abstract

What is the purpose of the `Serializable` interface in Java?

2 Mark(s)

To create a deep copy of an object
To allow objects to be serialized
To enable thread safety
To implement cloning

In Java, how can a subclass access the private members of its superclass?

2 Mark(s)

) Directly
) Through public methods of the superclass
By overriding the superclass method
By using reflection

Which of the following correctly describes a Java interface?

2 Mark(s)

It can have method implementations
It can contain instance variables
It can extend multiple classes
It can only contain abstract methods

What happens if a method in a subclass has the same name and parameters as a method in its superclass?

2 Mark(s)

The superclass method is executed
The subclass method is executed
A compile-time error occurs
The program fails to run

What is the result of using the `equals()` method in Java?

2 Mark(s)

It compares object references
It compares object content
It must be overridden in every class
It compares class types

Which of the following is NOT a feature of an inner class?

2 Mark(s)

It can access members of its outer class
It can have static members
It can be private, public, or protected
It can extend another class

Which keyword is used to exit a loop prematurely in Java?

2 Mark(s)

BREAK
CONTINUE
EXIT
OUT

What is the difference between 'while' and 'do-while' loops in Java?

2 Mark(s)

Syntax only
The do-while loop executes at least once
Execution speed
No difference

In a 'switch-case' statement, what is the role of the 'break' keyword?

2 Mark(s)

To pause the execution
To terminate the case block
To skip to the next case
To repeat the case block

What will be the output of the following code snippet:
if(false){
System.out.println("True");
}
else{
System.out.println("False");

2 Mark(s)

TRUE
FALSE

Which control structure is used to execute a block of code multiple times?

2 Mark(s)

switch-case
IF
try-catch
FOR

Spot the mistake in this code snippet:
int i = 0;
while(i < 10) {
i++;
}
System.out.println(i);

2 Mark(s)

Infinite loop
Syntax error
No error
Prints 0

Identify the error in this code:
int[] nums = new int[2]; nums[0] = 1; nums[1] = 2; nums[2] = 3;

2 Mark(s)

Array index out of bounds
Incorrect array declaration
Syntax error
No error

Determine the output:
SET num = 8
IF num MOD 2 = 0
THEN PRINT "Even"
ELSE
PRINT "Odd"

2 Mark(s)

EVEN
ODD
OUTPUT
ERROR

Evaluate this pseudocode:

SET a = 3 SET b = 4 PRINT a * b

2 Mark(s)

12
35
4
NONE

What is the output of this pseudocode?
SET x = 10
IF x > 5
THEN PRINT "Greater"
ELSE PRINT "Lesser"

2 Mark(s)

GREATER
LESSER
EROR
NONE

What will the following loop print?
for(int i = 0;
i < 3;
i++){
System.out.println(i);
}

2 Mark(s)

012
123
321
0

What is the output of this code?
int x = 1;
while(x < 4){
System.out.println(x); x++;
}

2 Mark(s)

1
1 2 3
1 3 5
0

What will this pseudocode output?

SET count = 5 DO PRINT count COUNTDOWN count

2 Mark(s)

5 4 3 2 1
0
1 2 3 4 5
1

What is the purpose of the `super` keyword?

2 Mark(s)

To call the parent class constructor
To reference the current class instance
To define an abstract method
To access private members of a superclass

In Java, which statement about inheritance is true?

2 Mark(s)

A class can extend multiple classes
A subclass inherits methods from its superclass
Inheritance can only be achieved through interfaces
Constructors are inherited by subclasses

Which of the following keywords is used to define an abstract class?

2 Mark(s)

abstract
final
static
virtual

What is the main purpose of an abstract class in Java?

2 Mark(s)

To create a class that cannot be instantiated
To provide a template for subclasses
To implement multiple inheritance
To allow the use of inner classes

What is the benefit of using generics with collections in Java?

2 Mark(s)

It allows collections to store any type of elements
It ensures type safety by allowing only specific types of elements
It reduces the size of collections
None of These

In a generic class, what does the wildcard `` represent?

2 Mark(s)

A wildcard type
A specific class
An unknown type
An exception type

Which symbol is used to denote a generic type parameter in Java?

2 Mark(s)

&
@
#
"

What is the main purpose of generics in Java?

2 Mark(s)

To enable type-safe collections and eliminate type casting
To increase program execution speed
To simplify the syntax of Java code
To improve memory management

Identify the error in this code:
for(int i=0;
i<=5;
i++) {
System.out.println(i);
}
System.out.println(i)

2 Mark(s)

Syntax error outside loop
No error
Variable i not accessible outside loop
Infinite loop

Analyze this pseudocode:

SET num = 0 WHILE num <= 5 IF num MOD 2 = 0 THEN PRINT num END IF INCREMENT num

2 Mark(s)

0 2 4
0 2 3
3 0 2
1 02

What does the following Java code print?
int x = 5;
int y = x++;
System.out.println(y);

2 Mark(s)

6
2
3
5

JAVA : Question 1 of 50

What is the result of attempting to cast an object to a class that it does not inherit from?

What is the result of attempting to cast an object to a class that it does not inherit from?

Which of the following is a feature of Java’s garbage collection?

Which of the following is a feature of Java’s garbage collection?

What does the final keyword signify when used with a class?

What does the final keyword signify when used with a class?

How can you achieve polymorphism in JaVA

How can you achieve polymorphism in JaVA

Which of the following keywords allows a class to inherit from an interface?

Which of the following keywords allows a class to inherit from an interface?

What is the purpose of the instanceof operator in JaVA

What is the purpose of the instanceof operator in JaVA

Which of the following statements is true about multiple inheritance in JAVA

Which of the following statements is true about multiple inheritance in JAVA

What is the visibility of private attributes in Java?

What is the visibility of private attributes in Java?

In Java, what is the visibility of a protected attribute?

In Java, what is the visibility of a protected attribute?

Which of the following is true about the Object class in Java?

Which of the following is true about the Object class in Java?

Why is it important to override the hashCode() method when overriding equals()?

Why is it important to override the hashCode() method when overriding equals()?

In Java, what is the result of attempting to instantiate an abstract class?

In Java, what is the result of attempting to instantiate an abstract class?

Which method can be used to create a deep copy of an object?

Which method can be used to create a deep copy of an object?

When a class inherits from an interface, which of the following must be implemented?

When a class inherits from an interface, which of the following must be implemented?

Which method in Java is called when an object is deserialized?

Which method in Java is called when an object is deserialized?

What is the default visibility of a class member declared without any access modifier?

What is the default visibility of a class member declared without any access modifier?

What is the purpose of the clone() method?

What is the purpose of the clone() method?

. Which of the following keywords is used to declare an inner class?

. Which of the following keywords is used to declare an inner class?

Which of the following statements about multiple inheritance of interfaces is true?

Which of the following statements about multiple inheritance of interfaces is true?

How do you prevent a method from being overridden in a subclass?

How do you prevent a method from being overridden in a subclass?

What is the purpose of the Serializable interface in Java?

What is the purpose of the Serializable interface in Java?

In Java, how can a subclass access the private members of its superclass?

In Java, how can a subclass access the private members of its superclass?

Which of the following correctly describes a Java interface?

Which of the following correctly describes a Java interface?

What happens if a method in a subclass has the same name and parameters as a method in its superclass?

What happens if a method in a subclass has the same name and parameters as a method in its superclass?

What is the result of using the equals() method in Java?

What is the result of using the equals() method in Java?

Which of the following is NOT a feature of an inner class?

Which of the following is NOT a feature of an inner class?

What is the purpose of the super keyword?

What is the purpose of the super keyword?

In Java, which statement about inheritance is true?

In Java, which statement about inheritance is true?

Which of the following keywords is used to define an abstract class?

Which of the following keywords is used to define an abstract class?

What is the main purpose of an abstract class in Java?

What is the main purpose of an abstract class in Java?

What is the benefit of using generics with collections in Java?

What is the benefit of using generics with collections in Java?

In a generic class, what does the wildcard `` represent?

In a generic class, what does the wildcard `` represent?

What is the main purpose of generics in Java?

What is the main purpose of generics in Java?

What does the `final` keyword signify when used with a class?

What does the `final` keyword signify when used with a class?

What is the purpose of the `instanceof` operator in JaVA

What is the purpose of the `instanceof` operator in JaVA

Why is it important to override the `hashCode()` method when overriding `equals()`?

Why is it important to override the `hashCode()` method when overriding `equals()`?

What is the purpose of the `clone()` method?

What is the purpose of the `clone()` method?

What is the purpose of the `Serializable` interface in Java?

What is the purpose of the `Serializable` interface in Java?

What is the result of using the `equals()` method in Java?

What is the result of using the `equals()` method in Java?

What is the purpose of the `super` keyword?

What is the purpose of the `super` keyword?