Quiz | Croma Campus

Which of these operators is used to allocate memory to an array variable in Java?

malloc
alloc
new
new malloc

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Which of the following option leads to the portability and security of Java?

Bytecode is executed by JVM
The applet makes the Java code secure
Use of exception handling
Dynamic binding between objects

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What is the default value of an instance variable?

null
0
depends on the type of variable
default values are same as local variables

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Which method is the starting point for all Java programs?

start()
main()
init()
run()

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Which exception is thrown when java is out of memory?

MemoryError
OutOfMemoryError
MemoryOutOfBoundsException
MemoryFullException

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What is the implicit return type of constructor?

no return type
void
int
float

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Which of the following is true about the anonymous inner class?

It has only methods
Objects can't be created
It has a fixed class name
It has no class name

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Which method is used to schedule a thread for execution?

run()
start()
resume()
yield()

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Which of these is a superclass of all exception classes?

Error
Throwable
RuntimeException
Exception

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Which method can be defined only once in a program?

main method
finalize method
static method
private method

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Which operator is used to test if a particular property exists or not?

in
instanceof
typeof
None of the mentioned

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Which of these cannot be used for a variable name in Java?

identifier
keyword
variable
constant

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Which of these is returned by the operator '&'?

Character
Integer
Boolean
Float

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Which of these methods is used to read a string from the input stream?

get()
getLine()
read()
readLine()

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What is the default value of the local variables?

null
0
depends on the type of variable
No default value for local variables

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Which of the following is used to find and fix bugs in Java programs?

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Which keyword is used to define an abstract class?

abstract
Abstract
final
static

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Which of these are valid identifiers?

_var
$var
var
All of the mentioned

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What is the default value of an instance variable?

null
0
depends on the data type
depends on the class

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How many times can a constructor be called during the lifetime of the object?

As many times as necessary
Only once
Depends on the type of class
At least once

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Which keyword is used to create an interface in Java?

class
interface
extends
implements

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Which of these cannot be used for a variable name in Java?

identifier
keyword
letter
underscore

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Which method is used to terminate a thread?

terminate()
end()
stop()
finish()

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Which of the following is a marker interface?

Runnable
Remote
Readable
Result

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Which keyword is used for inheritance in Java?

inherit
extends
implements
inherits

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Which method of the String class is used to compare two String objects for their equality?

equals()
compare()
equalsIgnoreCase()
compareTo()

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What is the output of: System.out.println(2 + "2");

4
22
"4"
"22"

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Which of these methods is not defined in the Math class?

min()
max()
abs()
getExponent()

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Which of these is a mechanism for naming and visibility control of a class and its content?

Object
Package
Interfaces
None of the mentioned

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Which method is the entry point for a Java application?

main
start
init
run

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