JAVA

Which feature of Java makes it possible to run a Java program on different platforms?

2 Mark(s)

Object-Oriented
Platform-Independent
Syntax
Memory Management

Which of these is not a valid way to instantiate an array in Java?

2 Mark(s)

int[] arr = new int[5];
int arr[] = new int[5]
.int arr[] = {1, 2, 3, 4, 5};
int arr[] = int[5];

What is the purpose of the 'length' attribute in a Java array?

2 Mark(s)

To determine the size of the array
To modify the size of the array
To sort the array
To initialize the array

How do you access the third element in an array named 'arr'?

2 Mark(s)

Compile-time error
Runtime error: ArrayIndexOutOfBoundsException
No error
Logical error

How do you access the third element in an array named 'arr'?

2 Mark(s)

arr[2]
arr[3]
arr(2)
arr(3)

What does 'BufferedReader' in Java provide that 'Scanner' does not?

2 Mark(s)

Faster input reading
Input from file only
Different data types
Graphical interface

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

2 Mark(s)

.if
switch-case
for
try-catch

What will be the output of the following Java program?

2 Mark(s)

127
126
Runtime Error
Compilation Error

Which of the following is a superclass of every class in Java?

2 Mark(s)

ArrayList
Abstract class
Object class
String

. What will be the output of the following Java program?

2 Mark(s)

9.0
8.0
4.0
2.0

What will be the output of the following Java code?

2 Mark(s)

257
256
1
0

In a multi-dimensional array, how do you access the element in the second row and third column of an array named 'matrix'?

2 Mark(s)

.matrix[1][2]
matrix[2][3]
matrix[2][2]
matrix[1][3]

Which of the following is not a Java access modifier?

2 Mark(s)

public
private
protected
package

Which exception is thrown when a thread is waiting, sleeping, or otherwise occupied, and the thread is interrupted?

2 Mark(s)

InterruptedException
IOException
SQLException
ArithmeticException

What is the purpose of the PATH environment variable in Java?

2 Mark(s)

To locate Java libraries
To store Java bytecode
To locate the Java compiler
To optimize Java code

Which component of Java is responsible for running the compiled Java bytecode?

2 Mark(s)

JDK
JVM
JRE
JIT

Which of these is not a feature of Java?

2 Mark(s)

Object-oriented
Platform-independent
Compiled
Interpreted language

Which of the following methods can be used to start a new thread in Java?

2 Mark(s)

start()
run()
execute()
init()

Which of the following is a superclass of every class in Java?

2 Mark(s)

Object
Class
Interface
super

Which operator is used to concatenate two strings in Java?

2 Mark(s)

+
&
&&
++

Which method is used to find the length of a string in Java?

2 Mark(s)

length()
size()
getSize()
getLength()

What is the default value of a local variable in Java?

2 Mark(s)

0
null
Undefined
Compiler error

Which of the following is a checked exception in Java?

2 Mark(s)

NullPointerException
ClassCastException
IOException
ArithmeticException

Which method must be implemented by all threads in Java?

2 Mark(s)

start()
run()
init()
execute()

. What will be the output of the following Java program?

2 Mark(s)

QuizziuQ
ziuQQuiz
Quiz
ziuQ

Determine the output.

2 Mark(s)

Even
Odd
Error
no out put

Which class provides system independent server side implementation?

2 Mark(s)

Server
ServerReader
Socket
ServerSocket

. What is the numerical range of a char data type in Java?

2 Mark(s)

0 to 256
-128 to 127
0 to 65535
) 0 to 32767

What will be the output of the following Java program?

2 Mark(s)

2 2
3 3
Runtime Error
Compilation Error

Which one of the following is not an access modifier?

2 Mark(s)

Protected
Void
Public
Private

What will be the output of the following Java code?

2 Mark(s)

truetrue
falsefalse
true
FALSE

Which of these keywords are used for the block to be examined for exceptions?

2 Mark(s)

check
throw
catch
try

Which of these statements is incorrect about Thread?

2 Mark(s)

start() method is used to begin execution of the thread
un() method is used to begin execution of a thread before start() method in special cases
A thread can be formed by implementing Runnable interface only
A thread can be formed by a class that extends Thread class

What will be the output of the following Java program?

2 Mark(s)

1 2 5 8
2 1 8 5
1 5 8 2
2 8 5 1

. Which of these packages contains the exception Stack Overflow in Java?

2 Mark(s)

java.io
java.system
java.lang
java.util

What will be the output of the following Java program?

2 Mark(s)

www.sanfoundry.com
https://www.sanfoundry.com/javamcq
sanfoundry
sanfoundry.com

What will be the output of the following Java program?

2 Mark(s)

4 6.4
6.4 6
6.4 6.4
6 6

Which of the following is true about servlets?

2 Mark(s)

Servlets can use the full functionality of the Java class libraries
Servlets execute within the address space of web server, platform independent and uses the functionality of java class libraries
Servlets execute within the address space of web server
Servlets are platform-independent because they are written in java

What is the purpose of the PATH environment variable in Java?

2 Mark(s)

To locate Java libraries
To store Java bytecode
To Locate the exe files (.exe)
To optimize Java code

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

2 Mark(s)

break
continue
exit
stop

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

Which class is commonly used for simple keyboard input in Java?

2 Mark(s)

Scanner
InputStream
BufferedReader
FileReader

In Java, what is the default value of an array of integers?

2 Mark(s)

0
null
1
-1

Which keyword is used to define a constant variable in Java?

2 Mark(s)

final
static
const
immutable

What is the result of this operation in Java?

2 Mark(s)

7
7.9
8
Syntax Error

What is the default value of a boolean variable in Java?

2 Mark(s)

TRUE
FALSE
0
NULL

What is multithreaded programming?

2 Mark(s)

It’s a process in which two different processes run simultaneously
It’s a process in which two or more parts of the same process run simultaneously
It’s a process in which many different process are able to access the same information
It’s a process in which a single process can access information from many sources

How do I comment on a block of code in Java?

2 Mark(s)

/*comment*/
//comment
.!--comment--
%comment

In Java, how should class names be written?

2 Mark(s)

.camelCase
snake_case
PascalCase
.kebab-case

Which of the below is not a Java Profiler?

2 Mark(s)

JProfiler
Eclipse Profiler
JVM
JConsole

JAVA : Question 1 of 50

Which of these is not a valid way to instantiate an array in Java?

Which of these is not a valid way to instantiate an array in Java?

What is the purpose of the 'length' attribute in a Java array?

What is the purpose of the 'length' attribute in a Java array?

How do you access the third element in an array named 'arr'?

How do you access the third element in an array named 'arr'?

How do you access the third element in an array named 'arr'?

How do you access the third element in an array named 'arr'?

What does 'BufferedReader' in Java provide that 'Scanner' does not?

What does 'BufferedReader' in Java provide that 'Scanner' does not?

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

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

In a multi-dimensional array, how do you access the element in the second row and third column of an array named 'matrix'?

In a multi-dimensional array, how do you access the element in the second row and third column of an array named 'matrix'?

Which of the following is not a Java access modifier?

Which of the following is not a Java access modifier?

Which exception is thrown when a thread is waiting, sleeping, or otherwise occupied, and the thread is interrupted?

Which exception is thrown when a thread is waiting, sleeping, or otherwise occupied, and the thread is interrupted?

Which of the following methods can be used to start a new thread in Java?

Which of the following methods can be used to start a new thread in Java?

Which of the following is a superclass of every class in Java?

Which of the following is a superclass of every class in Java?

Which operator is used to concatenate two strings in Java?

Which operator is used to concatenate two strings in Java?

Which method is used to find the length of a string in Java?

Which method is used to find the length of a string in Java?

What is the default value of a local variable in Java?

What is the default value of a local variable in Java?

Which of the following is a checked exception in Java?

Which of the following is a checked exception in Java?

Which method must be implemented by all threads in Java?

Which method must be implemented by all threads in Java?

Determine the output.

Determine the output.

What is the purpose of the PATH environment variable in Java?

What is the purpose of the PATH environment variable in Java?

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

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

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

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

Which class is commonly used for simple keyboard input in Java?

Which class is commonly used for simple keyboard input in Java?

In Java, what is the default value of an array of integers?

In Java, what is the default value of an array of integers?

Which keyword is used to define a constant variable in Java?

Which keyword is used to define a constant variable in Java?

What is the result of this operation in Java?

What is the result of this operation in Java?

What is the default value of a boolean variable in Java?

What is the default value of a boolean variable in Java?

What is multithreaded programming?

What is multithreaded programming?

How do I comment on a block of code in Java?

How do I comment on a block of code in Java?

In Java, how should class names be written?

In Java, how should class names be written?