Quiz | Croma Campus

Which method can be defined only once in a program?

main method
finalize method
static method
private method

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Which of the following is not a type of constructor?

Default constructor
No-argument constructor
Parameterized constructor
Copy constructor

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Which of the following is not a valid method of the HashMap class in Java?

put()
get()
size()
length()

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Which of the following statements is true about Java?

Java is a platform-independent language
Java is a procedural language
Java is a pure object-oriented language
Java supports both procedural and object-oriented programming

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Which of the following is not a valid operator in Java?

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Which of the following is used to declare a constant in Java?

const
final
static
constant

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Which of these is used to explain the type of exception that is thrown by a method?

throw
throws
thrown
exception

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In Java, what is the correct syntax to output "Hello World"?

System.out.println("Hello World");
print("Hello World");
echo("Hello World");
Console.WriteLine("Hello World");

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

int
float
boolean
String

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

new
create
array
instance

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What is the superclass of all classes in Java?

java.lang.String
java.lang.Object
java.lang.System
java.lang.Class

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Which method is used to perform some action when an object is to be destroyed?

finalize()
delete()
remove()
destructor()

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

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

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Which of the following is not a valid method of the Stack class in Java?

push()
pop()
size()
length()

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Which of the following is not a valid method of the PriorityQueue class in Java?

add()
remove()
size()
length()

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Which of the following is used to create a transient variable in Java?

transient
variable
var
transientVar

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Which of these is not a valid component of the Android architecture?

Intent
Activity
Services
Action

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Which method must be implemented by all threads?

run()
start()
stop()
wait()

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Which is a valid declaration of a char?

char ch = '\utea';
char ch = '\uface';
char ch = 'face';
char ch = 'afe';

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Which of these data types is used to store text in Java?

int
float
char
String

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

int
float
double
real

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Which of the following is not a state of a thread?

New
Runnable
Blocked
Running

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Which of these methods is a part of the Object class in Java?

toString()
equals()
hashCode()
All of the above

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Which of the following is not a feature of Java?

Object-oriented
Use of pointers
Platform-independent
Robust

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Which of the following is used to create a thread in Java?

Runnable interface
Thread class
Both A and B
None of the above

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Which is the valid declaration within an interface definition?

public double methoda();
public final double methoda();
static void methoda(double d1);
protected void methoda(double d1);

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Which of the following is not a valid method of the TreeSet class in Java?

add()
remove()
size()
length()

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

package
import
extends
implements

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Which of the following is used to create a final class in Java?

final
class
interface
extends

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Which keyword is used to inherit a class in Java?

extends
implements
inherits
super

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