JAVA-EFC CHENNAI-BATCH1 DATED 07TH NOV 2024 - MSME

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JAVA-EFC-CHENNAI BATCH1-07TH NOVEMBER 2024

1 / 50

What is the correct way to manually request garbage collection in Java?

System.free();

Runtime.getRuntime().gc();

System.gc();

finalize();

2 / 50

In Java, a class can contain:

Variables and methods

Only variables

Only methods

Only objects

3 / 50

Which block is used to specify a code that must be executed regardless of an exception being handled or not?

try

catch

finally

throw

4 / 50

Which loop in Java checks the condition after executing the loop's body?

for loop

while loop

do-while loop

enhanced for loop

5 / 50

What are regexes in Java?

API to define a pattern for searching strings

String

Array to create a new integer

Wrapper class

6 / 50

Which keyword is used to implement an interface in Java?

implements

extends

inherits

overrides

7 / 50

Which of the following is a correct example of method overloading?

Defining multiple methods in a class with the same name but different parameter lists

Redefining a method in a subclass

Changing the return type of a method

Implementing a method from an interface

8 / 50

Which statement is used to specify a block of code that will be executed regardless of the conditions in a try-catch block?

catch

finally

else

return

9 / 50

What is a set in Java?

Represented in the form of values

Used to store key-value pairs

Primary structures

All of these

10 / 50

What is a map in Java?

Data structure

Defined in java.util package

Represented using key-value pairs

All of these

11 / 50

Which keyword is used to handle exceptions in Java?

try

catch

throw

All of the above

12 / 50

Which OOP principle is used to hide the internal details of an object and only expose what is necessary?

Polymorphism

Encapsulation

Abstraction

Inheritance

13 / 50

Which of the following is not a Java features?

Dynamic

Architecture Neutral

Use of pointers

Object-oriented

14 / 50

Which of the following is true about interfaces in Java?

Interfaces can contain method implementations

Interfaces can have constructors

Interfaces can contain only abstract methods and final variables

Interfaces can contain instance variables

15 / 50

Which of the following is the correct way to exit from all nested loops?

Use multiple break statements

Use labeled break statement

Use exit() method

Nested loops cannot be exited together

16 / 50

Which of the following is NOT a characteristic of an object?

State

Behavior

Identity

Static

17 / 50

Which keyword is used for accessing the features of a package?

package

import

extends

export

18 / 50

Which Java keyword is used to access the features of a package?

get

import

extends

All of these

19 / 50

What does the java command do?

Compiles Java code

Executes Java bytecode

Documents Java code

Packages Java classes

20 / 50

Which method in Java is used to check for NaN values?

isNan()

checkNan()

isNotNan()

All of these

21 / 50

Which operator is used to check multiple conditions in a single if statement?

Both a and b

22 / 50

Which of the following is a reserved keyword in Java?

object

strictfp

main

system

23 / 50

_____ is used to find and fix bugs in the Java programs.

JVM

JRE

JDK

JDB

24 / 50

Which of the following statements is true?

An abstract class can implement an interface

An interface can extend a class

An abstract class cannot extend another abstract class

An interface can extend multiple classes

25 / 50

When a finally block executed in Java?

Try block is executed without any exception

Exception has occurred

Executed at last

None of these

26 / 50

What is the use of the intern() method?

It returns the existing string from memory

It creates a new string in the database

It modifies the existing string in the database

None of the above

27 / 50

Which of these is a non-access modifier?

public

private

native

All of these

28 / 50

The trim() method in Java used to ______________

Remove the given character

Remove the values after the given index

Remove leading and trailing spaces

None of these

29 / 50

Which of the following correctly defines a class in Java?

A blueprint for creating objects

A collection of objects

A data type

A method

30 / 50

What is boolean in Java?

A value consisting of only true and false value

A value consisting of 8 values

Truthy value in java

All of these

31 / 50

In which memory a String is stored, when we create a string using new operator?

Stack

String memory

Heap memory

Random storage space

32 / 50

Which of the following methods is used to extract the length of a stringin Java?

length()

len()

sizeof()

size()

33 / 50

Which of the following is a marker interface?

Runnable interface

Remote interface

Readable interface

Result interface

34 / 50

Polymorphism allows us to:

Define multiple methods with the same name but different implementations

Hide implementation details from the user

Create a single instance of a class

Prevent the modification of data

35 / 50

Which of the following is a correct way to declare an abstract method in Java?

abstract void methodName();

abstract method methodName();

void methodName() abstract;

methodName() abstract;

36 / 50

The result of dividing by 0 in Java is _____________

Error

Expectation

Infinite

None of these

37 / 50

Which OOP principle helps to reduce redundancy in code by reusing existing classes?

Polymorphism

Encapsulation

Inheritance

Abstraction

38 / 50

Which of the following is a primitive data type in Java?

String

Class

int

Array

39 / 50

Which of the following option leads to the portability and security of Java?

Bytecode is executed by JVM

The applet makes the Java code secure and portable

Use of exception handling

Dynamic binding between objects

40 / 50

Which command is used to compile a Java program?

java

javac

javadoc

jar

41 / 50

Which of the following is true about the try-catch block?

A try block must be followed by at least one catch block

A try block must be followed by either a catch or a finally block

A try block cannot be used without a catch block

A try block cannot contain another try-catch block

42 / 50

Where are Java source files stored by convention?

.java extension files

.class extension files

.jar extension files

.exe extension files

43 / 50

After compilation, Java code is converted into:

Machine code

Assembly code

Bytecode

C++ code

44 / 50

Which of the following is used to create an object in Java?

import

new

this

super

45 / 50

Which of the following is the correct syntax for an if-else statement in Java?

if (condition) { ... } else { ... }

if (condition) { ... } else if (condition) { ... }

if (condition) else { ... }

if (condition) { ... } else

46 / 50

Which of the following is a checked exception in Java?

ArithmeticException

NullPointerException

IOException

ArrayIndexOutOfBoundsException

47 / 50

An abstract class in Java:

Cannot have any concrete methods

Can be instantiated directly

Can have both abstract and concrete methods

Cannot have constructors

48 / 50

Which of the following is NOT an application of OOP?

Operating systems

Real-time systems

Artificial Intelligence

Spreadsheets

49 / 50

Which of the following statements is used to exit a loop prematurely?

continue

break

return

exit

50 / 50

Which of these is not a valid Boolean method in Java?

equals() method

hashCode() method

toString() method

All of these

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