Quiz4

Which of this keyword must be used to inherit a class?

• super

• this

• extent

• extends

Which of these is correct way of inheriting class A by class B?

• class B + class A {}

• class B inherits class A {}

• class B extends A {}

• class B extends class A {}

What will be the output of the following Java program?

class A

{

int i;

void display()

{

System.out.println(i);

}

}

class B extends A

{

int j;

void display()

{

System.out.println(j);

}

}

class inheritance_demo

{

public static void main(String args[])

{

B obj = new B();

obj.i=1;

obj.j=2;

obj.display();

}

}

• 0

• 1

• 2

• Compilation Error

What will be the output of the following Java program?

class A

{

int i;

}

class B extends A

{

int j;

void display()

{

super.i = j + 1;

System.out.println(j + " " + i);

}

}

class inheritance

{

public static void main(String args[])

{

B obj = new B();

obj.i=1;

obj.j=2;

obj.display();

}

}

• 2 2

• 3 3

• 2 3

• 3 2

____________ can be defined as the process where one class acquires the properties (methods and fields) of another.

• Overriding

• Polymorphism

• Inheritance

• Abstraction

The class which inherits the properties of other is known as ________

• superclass

• subclass

• parent class

• None of the above

Subclass also known as ?

• derived class

• child class

• base class

• Both A and B

The class whose properties are inherited is known as superclass.

• TRUE

• FALSE

• Can be true or false

• Can not say

 ______ is a way of saying: This object is a type of that object.

• IS-A

• HAS-A

• ARE-A

• HAD-A

A subclass inherits all the members (fields, methods, and nested classes) from its superclass

• Yes

• NO

• Can be yes or no

• Can not say