InfyTQ Polymorphism Quiz 1

Question 1

Time: 00:00:00

Examine the following class declaration? Is this valid?

Public class newclass extends maruti extends car



{



}

Yes, multiple inheritance is allowed

Yes, but it will generate warnings

It depends on the system running it

No, Java doesn't support multiple inheritance

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Question 2

Time: 00:00:00

class exam 

{ 

    void myMethod() 

    { 

        System.out.println("prepinstaplacement"); 

    } 

} 

public class Derived extends exam 

{ 

    void myMethod() 

    { 

        System.out.println("prepinsta"); 

    } 

    

    public static void main(String[] args) 

    { 

        Derived obj = new exam(); 

        obj.myMethod(); 

    } 

}

prepinstaplacement

prepinsta

Compilation error

Runtime error

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Question 3

Time: 00:00:00

In object-oriented programming, new classes can be defined by extending existing classes. This is an example of:

Encapsulation

Interface

Composition

Inheritance

Aggregation

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Question 4

Time: 00:00:00

What is the name of the class that is the ancestor to every other class in Java?

object

class

Root

java

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Question 5

Time: 00:00:00

Examine the following code:

String str = "prepinsta";



boolean switch = str instanceof String;

What value is placed in the switch?

true

false

prepinsta

null

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Question 6

Time: 00:00:00

An Overridden method is the method of ____ class and the overriding method is the method of ___ class.

sub, super

super, super

super, sub

sub, sub

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Question 7

Time: 00:00:00

What concepts come under Polymorphism in java?

Method overloading

Constructor overloading

Method overriding

All the above

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Question 8

Time: 00:00:00

Which of the following does not belong: If a class inherits from some other class, it should

Make use of the parent class’s capabilities

Over-ride or add the minimum to accomplish the derived class’ purpose

Override all the methods of its parent class

Make sure the result “IS-A-KIND-OF” its base class

Make sure the result “contains” its base class

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Question 9

Time: 00:00:00

Object-oriented inheritance models the

“is a kind of” relationship

“has a” relationship

“want to be” relationship

inheritance does not describe any kind of relationship between classes

“contains” of relationship

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Question 10

Time: 00:00:00

class prepinsta 

{ 

    protected void getData() 

    { 

        System.out.println("Inside prepinsta"); 

    }

} 

class prepinstaplacement extends prepinsta 

{

    protected void getData() 

    { 

        System.out.println("Inside prepinstaplacement"); 

    } 

} 



public class exam 

{ 

    public static void main(String[] args) 

    {

       prepinsta obj = new prepinstaplacement(); 

        obj.getData(); 

    } 

}