Quiz | Croma Campus

What is the return type of the hashCode() method in Java?

int
long
String
float

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Which of the following is used to find the absolute value of a number in Java?

Math.abs()
Math.absolute()
Math.absValue()
Math.absoluteValue()

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Which of the following is not an access modifier in Java?

public
private
protected
internal

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What is the output of the following code? System.out.println(2 + "3");

5
23
2 3
Error

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Which of the following is a wrapper class in Java?

int
float
char
Integer

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Which of the following is used to handle exceptions in Java?

try-catch
if-else
switch-case
for-loop

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Which of the following is used to generate random numbers?

Random class
Math.random()
java.util.Random
All of the above

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What is the size of an int data type in Java?

4 bytes
2 bytes
8 bytes
1 byte

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Which of the following is not a Java feature?

Object-Oriented
Portable
Dynamic
Use of Pointers

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What is the superclass of all classes in Java?

Object
Class
Interface
Base

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

create()
init()
constructor
new()

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Which of the following is a reserved word in Java?

main
System
new
print

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

toString()
getString()
convertString()
toChar()

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Which keyword is used to define a subclass in Java?

subclass
inherits
extends
implements

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Which of the following is true about Java's garbage collection?

It is manual
It is automatic
It is optional
None of the above

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Which operator is used for comparing two values?

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Which method is used to stop a thread in Java?

stop()
end()
terminate()
kill()

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Which method is used to add an element at the end of a list in Java?

addElement()
insert()
append()
add()

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Which of the following is not a valid way to create an object in Java?

new ClassName()
Class.forName("ClassName").newInstance()
ClassName.clone()
ClassName.new()

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Which of the following is a valid declaration of a float variable in Java?

float f = 1.0;
float f = 1.0d;
float f = 1;
float f = 1.0f;

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Which method is used to read a line of text from the console in Java?

readLine()
read()
getLine()
nextLine()

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Which method must be implemented by all threads in Java?

run()
start()
stop()
sleep()

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What is the result of 10 % 3?

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Which method is used to start a thread execution?

run()
start()
execute()
launch()

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Which of the following is a marker interface?

Serializable
Cloneable
Remote
All of the above

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

TRUE
FALSE
0
null

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What is the use of the 'this' keyword in Java?

To refer to the current object
To refer to a superclass object
To refer to a static object
To refer to a local variable

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Which interface is used to store a collection of elements in Java?

List
Set
Map
All of the above

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Which of the following is the correct way to handle multiple exceptions in Java 7 and later?

Multiple catch blocks
A single catch block
A single catch block with multiple exceptions separated by a comma (,)
)

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Which of the following is not a primitive data type in Java?

int
float
boolean
String

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