Quiz | Croma Campus

Which operator is considered to be with the highest precedence?

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What will be the output of System.out.println(10 + 20 + "30");?

3030
102030
30
102030

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Which class is used to read from a file in Java?

FileReader
FileWriter
BufferedWriter
PrintWriter

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Which method is used to start a thread in Java?

run()
start()
init()
begin()

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What is used to achieve multiple inheritance in Java?

Interfaces
Abstract classes
Both
None of the above

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Which of these is an interface in the Collections Framework?

ArrayList
HashSet
LinkedList
Set

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

int
String
float
boolean

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Which of the following is a valid long literal?

0x99ffL
ABCDE
0x99ff
99ffL

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How many times is the do while loop guaranteed to execute?

0
1
2
infinite

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Which keyword is used to inherit a class in Java?

extend
inherit
extends
implements

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What is the use of the finalize() method?

To clean up resources
To start garbage collection
To end the program
None of the above

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Which method is used to terminate a thread in Java?

stop()
terminate()
end()
interrupt()

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What is the output of 10 + 20 + "30" in Java?

"3030"
"102030"
"30"
60

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Which of the following is a valid declaration of an array?

int[] arr;
int arr[];
int[] arr = new int[10];
All of the above

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What is the purpose of the hashCode() method?

To compare two objects
To generate a unique integer for an object
To clone an object
To get the memory address of an object

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

finalize()
init()
start()
constructor

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

getSize()
sizeOf()
lengthOf()
length()

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

public
private
protected
default

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

TRUE
FALSE
0
1

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

int
Object
long
void

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Which of the following is true about inheritance in Java?

A class can inherit multiple classes
A class can implement multiple interfaces
A class can extend multiple interfaces
A class can implement multiple classes

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What is a correct way to synchronize a method in Java?

synchronized void method()
synchronized(method)
sync void method()
void synchronized method()

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Which of the following is a marker interface?

Serializable
Cloneable
Remote
All of the above

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Which operator is used to create an object in Java?

new
create
object
instance

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Which is the correct declaration of an abstract class?

abstract class MyClass {}
class abstract MyClass {}
MyClass abstract class {}
None of the above

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Which of the following is a valid constructor of the String class?

String(String str)
String()
String(char[] charArray)
All of the above

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Which of these are selection statements in Java?

if()
for()
continue
break()

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What is the output of "Hello".concat("World") in Java?

Hello World
HelloWorld
Hello+World
Hello World!

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Which of the following is not a valid declaration of a char?

char ch = 'A';
char ch = 65;
char ch = '\u0041';
char ch = "A";

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Which package contains the Random class?

java.util
java.lang
java.io
java.net

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