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 these are selection statements in Java?

break, continue
for, do, while
if, switch
try, catch

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

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

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

Character
Integer
Boolean
Float

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

ArrayList
Abstract class
Object class
String class

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What is the size of int variable in Java?

8 bits
16 bits
32 bits
64 bits

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What is the implicit return type of the constructor?

void
int
float
None of the mentioned

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What is the default value of a local variable?

null
0
depends on the data type
no default value

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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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Which method is used to schedule a thread for execution?

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

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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 keyword is used for accessing the features of a package?

package
import
extends
implements

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Which of the following is not a primitive data type?

Byte
String
Integer
Float

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What is the default value of a float variable?

0.0d
0.0f
0
0

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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 operator is used by Java for string concatenation?

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What is the range of short data type in Java?

-128 to 127
-32768 to 32767
-2147483648 to 2147483647
None of the mentioned

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Which of these is not a wrapper class?

Integer
String
Byte
Double

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What does the expression 1.0 / 0.0 evaluate to in Java?

0
NaN
Infinity
Runtime Exception

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Which of the following is not an access modifier?

public
protected
void
private

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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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Which of the following is a marker interface?

Serializable
Runnable
Remote
Result

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Which of the following is not a Java feature?

Object-oriented
Use of pointers
Portable
Dynamic and Extensible

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What is the size of an int variable in Java?

4 bytes
2 bytes
8 bytes
16 bytes

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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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In which memory a String is stored, when we create a string using new operator?

Stack
String memory
Heap
Random memory

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Which of these classes are the direct subclasses of the Throwable class?

RuntimeException and Error
Exception and VirtualMachineError
Error and Exception
IOException and RuntimeException

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Which of these keywords is used to define interfaces in Java?

interface
Interface
intf
Intf

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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 default value of the local variables?

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

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