JAVA interview question set 18

Which exception is thrown when java is out of memory? Which exception is thrown when java is out of memory?

1 Mark(s)

MemoryFullException
MemoryOutOfBoundsException
OutOfMemoryError
MemoryError

What is the process of defining a method in terms of itself, that is a method that calls itself? What is the process of defining a method in terms of itself, that is a method that calls itself?

1 Mark(s)

Polymorphism
Abstraction
Encapsulation
Recursion

Can a class be declared with a protected modifier Can a class be declared with a protected modifier

1 Mark(s)

true
false

Which of these is correct about passing an argument by call-by-value process? Which of these is correct about passing an argument by call-by-value process?

1 Mark(s)

Copy of argument is made into the formal parameter of the subroutine
Reference to original argument is passed to formal parameter of the subroutine
Copy of argument is made into the formal parameter of the subroutine and changes made on parameters of subroutine have effect on original argument
Reference to original argument is passed to formal parameter of the subroutine and changes made on parameters of subroutine have effect on original argument

Which one of the following is not an access modifier? Which one of the following is not an access modifier?

1 Mark(s)

public
private
protected
void

Which of these keywords is used to prevent content of a variable from being modified? Which of these keywords is used to prevent content of a variable from being modified?

1 Mark(s)

final
last
constant
static

Which of these can be overloaded? Which of these can be overloaded?

1 Mark(s)

Methods
Constructors
All of the mentioned
None of the mentioned

Which of these is used as a default for a member of a class if no access specifier is used for it? Which of these is used as a default for a member of a class if no access specifier is used for it?

1 Mark(s)

private
public
public, within its own package
protected

What is -Xms and -Xmx while starting jvm? What is -Xms and -Xmx while starting jvm?

1 Mark(s)

Initial; Maximum memory
Maximum; Initial memory
Maximum memory
Initial memory

Which of the below is not a Java Profiler? Which of the below is not a Java Profiler?

1 Mark(s)

JVM
JConsole
JProfiler
Eclipse Profiler

Which of these access specifier must be used for class so that it can be inherited by another subclass? Which of these access specifier must be used for class so that it can be inherited by another subclass?

1 Mark(s)

public
private
protected
None of the mentioned

What happens if constructor of class A is made private? What happens if constructor of class A is made private?

1 Mark(s)

Any class can instantiate objects of class A
Objects of class A can be instantiated only within the class where it is declared
Inherited class can instantiate objects of class A
classes within the same package as class A can instantiate objects of class A

Arrays in Java are implemented as? Arrays in Java are implemented as?

1 Mark(s)

class
object
variable
None of the mentioned

What is true of final class? What is true of final class?

1 Mark(s)

Final class cause compilation failure
Final class cannot be instantiated
Final class cause runtime failure
Final class cannot be inherited

How many copies of static and class variables are created when 10 objects are created of a class? How many copies of static and class variables are created when 10 objects are created of a class?

1 Mark(s)

1, 10
10, 10
10, 1
1, 1

What is the process by which we can control what parts of a program can access the members of a class? What is the process by which we can control what parts of a program can access the members of a class?

1 Mark(s)

Polymorphism
Abstraction
Encapsulation
Recursion

Which of the following statements are incorrect? Which of the following statements are incorrect?

1 Mark(s)

public members of class can be accessed by any code in the program
private members of class can only be accessed by other members of the class
private members of class can be inherited by a subclass, and become protected members in subclass
protected members of a class can be inherited by a subclass, and become private members of the subclass

Which of these cannot be declared static? Which of these cannot be declared static?

1 Mark(s)

class
object
variable
method

How can a protected modifier be accessed? How can a protected modifier be accessed?

1 Mark(s)

accessible only within the class
accessible only within package
accessible within package and outside the package but through inheritance only
accessible by all

Which is the modifier when there is none mentioned explicitly? Which is the modifier when there is none mentioned explicitly?

1 Mark(s)

protected
private
public
default

What happens to the thread when garbage collection kicks off? What happens to the thread when garbage collection kicks off?

1 Mark(s)

The thread continues its operation
Garbage collection cannot happen until the thread is running
The thread is paused while garbage collection runs
The thread and garbage collection do not interfere with each other

Which of the following modifier means a particular variable cannot be accessed within the package? Which of the following modifier means a particular variable cannot be accessed within the package?

1 Mark(s)

private
public
protected
default

Which of these access specifiers must be used for main() method? Which of these access specifiers must be used for main() method?

1 Mark(s)

private
public
protected
None of the mentioned

Which of these is used to access a member of class before object of that class is created? Which of these is used to access a member of class before object of that class is created?

1 Mark(s)

public
private
static
protected

Garbage Collection can be controlled by a program? Garbage Collection can be controlled by a program?

1 Mark(s)

true
false

All the variables of class should be ideally declared as? All the variables of class should be ideally declared as?

1 Mark(s)

private
public
protected
default

All the variables of interface should be? All the variables of interface should be?

1 Mark(s)

default and final
default and static
public, static and final
protect, static and final

What is the process of defining two or more methods within same class that have same name but different parameters declaration? What is the process of defining two or more methods within same class that have same name but different parameters declaration?

1 Mark(s)

method overloading
method overriding
method hiding
none of the mentioned

Which of the below is not a memory leak solution? Which of the below is not a memory leak solution?

1 Mark(s)

Code changes
JVM parameter tuning
Process restart
GC parameter tuning

How to get prints of shared object memory maps or heap memory maps for a given process? How to get prints of shared object memory maps or heap memory maps for a given process?

1 Mark(s)

jmap
memorymap
memorypath
jvmmap

JAVA interview question set 18 : Question 1 of 30