JAVA interview question set 19

Which of the following is a method having same name as that of its class? Which of the following is a method having same name as that of its class?

1 Mark(s)

finalize
delete
class
constructor

What is not the use of “this” keyword in Java? What is not the use of “this” keyword in Java?

1 Mark(s)

Passing itself to another method
Calling another constructor in constructor chaining
Referring to the instance variable when local variable has the same name
Passing itself to method of the same class

What is true about Class.getInstance()? What is true about Class.getInstance()?

1 Mark(s)

Class.getInstance calls the constructor
Class.getInstance is same as new operator
Class.getInstance needs to have matching constructor
Class.getInstance creates object if class does not have any constructor

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

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 this statement is incorrect? Which of this statement is incorrect?

1 Mark(s)

All object of a class are allotted memory for the all the variables defined in the class
If a function is defined public it can be accessed by object of other class by inheritation
main() method must be made public
All object of a class are allotted memory for the methods defined in the class

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

What is the return type of Constructors? What is the return type of Constructors?

1 Mark(s)

int
float
void
None of the mentioned

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

What is true about constructor? What is true about constructor?

1 Mark(s)

It can contain return type
It can take any number of parameters
It can have any non access modifiers
Constructor cannot throw an exception

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

Abstract class cannot have a constructor. Abstract class cannot have a constructor.

1 Mark(s)

true
false

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

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 false about constructor? What is false about constructor?

1 Mark(s)

Constructors cannot be synchronized in Java
Java does not provide default copy constructor
Constructor can be overloaded
“this” and “super” can be used in a constructor

Which function is used to perform some action when the object is to be destroyed? Which function is used to perform some action when the object is to be destroyed?

1 Mark(s)

finalize()
delete()
main()
None of the mentioned

What would be behaviour if the constructor has a return type? What would be behaviour if the constructor has a return type?

1 Mark(s)

Compilation error
Runtime error
Compilation and runs successfully
Only String return type is allowed

What is true about private constructor? What is true about private constructor?

1 Mark(s)

Private constructor ensures only one instance of a class exist at any point of time
Private constructor ensures multiple instances of a class exist at any point of time
Private constructor eases the instantiation of a class
Private constructor allows creating objects in other classes

What is true about protected constructor? What is true about protected constructor?

1 Mark(s)

Protected constructor can be called directly
Protected constructor can only be called using super()
Protected constructor can be used outside package
protected constructor can be instantiated even if child is in a different package

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

What would be the behaviour if this() and super() used in a method? What would be the behaviour if this() and super() used in a method?

1 Mark(s)

Runtime error
Throws exception
compile time error
Runs successfully

Which of the following has the highest memory requirement? Which of the following has the highest memory requirement?

1 Mark(s)

Heap
Stack
JVM
Class

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

1 Mark(s)

true
false

Which of the following is a garbage collection technique? Which of the following is a garbage collection technique?

1 Mark(s)

Cleanup model
Mark and sweep model
Space management model
Sweep model

Where is a new object allocated memory? Where is a new object allocated memory?

1 Mark(s)

Young space
Old space
Young or Old space depending on space availability
JVM

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

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

What would be the behaviour if one parameterized constructor is explicitly defined? What would be the behaviour if one parameterized constructor is explicitly defined?

1 Mark(s)

Compilation error
Compilation succeeds
Runtime error
Compilation succeeds but at the time of creating object using default constructor, it throws compilation error

Which keyword is used by the method to refer to the object that invoked it? Which keyword is used by the method to refer to the object that invoked it?

1 Mark(s)

import
catch
abstract
this

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

1 Mark(s)

default constructor is called at the time of object declaration
constructor can be parameterized
finalize() method is called when a object goes out of scope and is no longer needed
finalize() method must be declared protected

JAVA interview question set 19 : Question 1 of 30