JAVA-EFC-DELHI-DATED-14THAUGUST2024 - MSME

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JAVA-EFC-DELHI-14THAUGUST2024

1 / 50

Encapsulation is ______________

Wrapping up of data and related functions into a single entity

Creating special methods

Creating special data structure

All of these

2 / 50

Abstract class is ____________

Created using abstract keyword

Contains only abstract method

Needs to be inherited to be used

All of these

3 / 50

What is the entry point of a program in Java?

main() method

The first line of code

Last line of code

main class

4 / 50

Can the Java program accept input from the command line?

Yes, using command-line arguments

Yes, by access command prompt

None of these

5 / 50

Which of the following methods are present in comparator interface?

compare()

equate()

isEqual()

All of these

6 / 50

Multiline comment is created using ________________

/* */

All of these

7 / 50

Static variables in java are declared as __________________

final variables

new variables

Constants

All of these

8 / 50

Which Java method is used to clear the element of ArrayList?

deleteAll()

delete()

clearAll()

clear()

9 / 50

What is a comparator in Java?

Interface to compare integer

Comparison method for lists

Interface to compare two objects in java

All of these

10 / 50

Which Java method is used to convert an object to a string?

createString()

toString()

object.string()

newString()

11 / 50

Can we write a program without a main method in Java?

Yes

12 / 50

Which method in java is used to read lines fromfile?

file.read()

file.nextLine()

file.getLine()

All of these

13 / 50

Array in Java is ______________

Collection of similar elements

Collection of elements of different types

The data type of consisting of characters

None of these

14 / 50

JDK stands for _________________

Java development kit

Java deployment kit

JavaScript deployment kit

None of these

15 / 50

Which of the following is false?

The rt.jar stands for the runtime jar

It is an optional jar file

It contains all the compiled class files

All the classes available in rt.jar is known to the JVM

16 / 50

The 'super' keyword is used to ______________

Access instance of the parent class

Access instance of the same class

Access instance of child class

Access instance of friend class

17 / 50

Can the main() method be overloaded in Java?

Yes

18 / 50

What is the default encoding of OutstreamWriter?

UTF-32

UTF-16

UTF-12

Based on the host platform

19 / 50

Which syntax is valid to create a vector in java?

Vector names = new Vector ();

Vector name = new string;

int name = new vector ()

All of these

20 / 50

Which of these is a type of variable in Java?

Instance Variable

Local Variable

Static Variable

All of these

21 / 50

What is a deadlock in Java?

State when all processes have complete working and are dead

State when threads are in hold state forever

State when threads are not ready

All of these

22 / 50

What is type casting in Java?

It is converting type of a variable from one type to another

Casting variable to the class

Creating a new variable

All of these

23 / 50

Can we keep a different name for the java class name and java file
name?

Yes

24 / 50

The correct syntax to import the math library in Java is ______________

import java.lang.math

import math

import java.math

All of these

25 / 50

Wrapper class in java is ___________.

Used to encapsulate primitive data types

Declare new classes called wrapper

Create a new instance of the class

None of these

26 / 50

What is stringBuffer in Java?

Class to create a string array

Class to create a mutable string in java

Class to create a string from i/o buffer

All of these

27 / 50

Which keyword in Java is used for exception handling?

exep

excepHand

throw

All of these

28 / 50

What will be the output of the following Java code?

public class Main {
public static void main(String[] args) {
String str = "Hello" ;
str = "Bye";

System.out.println(str);
}
}

Hello

Bye

Error

All of these

29 / 50

Multithreading in java is _______________

Executing multiple processes simultaneously

Creating more threads at a time

Blocking threads

All of these

30 / 50

Object in java are __________

Classes

Iterators

References

None of these

31 / 50

Which Java method is used to detect the OS in which the Java program is being run?

system.getOSdetails()

system.get(os.name)

system.getProperties("os.name")

system.getProperties("os")

32 / 50

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

Stack

String memory

Heap memory

Random storage space

33 / 50

Which of the following statements is not correct for vectors inJava?

It was created using vector keyword

It can store an object of different classes

It is asynchronous

None of these

34 / 50

Which class in Java is used to take input from the user?

Scanner

Input

Applier

None of these

35 / 50

The break statement in Java is used to ______________

Terminates from the loop immediately

Terminates from the program immediately

Skips the current iteration

All of these

36 / 50

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

length()

len()

sizeof()

size()

37 / 50

What is meant by the classes and objects that dependents on each other?

Tight Coupling

Cohesion

Loose Coupling

None of the above

38 / 50

Which of the following can be declared as final in java?

Class

Method

Variable

All of these

39 / 50

What is garbage collection in Java?

Method to manage memory in java

Create new garbage values

Delete all values

All of these

40 / 50

Which of the following is a valid data structure in java?

Array

List

Vector

All of these

41 / 50

The super() method is used to _____________

Call constructor of friend class

Is a declared method

Call constructor of the parent class

Call constructor

42 / 50

Which method deletes a file in Java?

file.delete()

file.remove()

file.garbage()

file.dump()

43 / 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

44 / 50

Which method in java is used to generate randomnumbers in Java?

random.nextInt()

random()

rand()

All of these

45 / 50

Method used to take a string as input in Java?

next()

nextLine()

Both A. and B.

None of these

46 / 50

Which method is used to convert radians to degree in Java?

convertRadtoDeg()

toDegrees()

degree()

All of these

47 / 50

Boxing is __________.

Creating new box

Creating object

Converting primitive type of object instance

All of these

48 / 50

What are the types of memory allocated in memory in java?

Heap memory

Stack memory

Both A and B

None of these

49 / 50

Which of these is the correct method to create an array in java?

int[] arr = {1, 3, 5};

int[] arr;

arr = new int[] {3, 1, 8};

int arr[] = {1, 4, 6};

All of these

50 / 50

What will be the output of the following Java code?

public class Main {
public static void main(String[] args) {
System.out.println(Math.copySign(100.6, -200.6));
}

100.6

-100.6

-200.6

200.6

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