4. What is Polymorphism?

4. What is Polymorphism?

 The abiltiy to define more than one function with the same name is called Polymorphism. In java,c++ there are two type of polymorphism: compile time polymorphism (overloading) and runtime polymorphism (overriding).

When you override methods, JVM determines the proper methods to call at the program’s run time, not at the compile time. Overriding occurs when a class method has the same name and signature as a method in parent class.

Overloading occurs when several methods have same names with

Overloading is determined at the compile time.

Different method signature and different number or type of parameters.

Same method signature but different number of parameters.

Same method signature and same number of parameters but of different type

 


 a)Example of Overloading
 

int sum(int a,int b)

float sum(float a,int b)

float sum(int a ,float b)

void sum(float a)

int sum(int a)

void sum(int a)

//error conflict with the method int sum(int a)

 b) Example: Overloading

 

Class BookDetails{

String title;

String publisher;

float price;

setBook(String title)

{

}

setBook(String title, String publisher)

{

}

setBook(String title, String publisher,float price){

}

 

}
Example: Overriding
 

class BookDetails{

String title;

setBook(String title){ }

}

class ScienceBook extends BookDetails{

setBook(String title){} //overriding

setBook(String title, String publisher,float price){ } //overloading

}


 

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Posted on Feb 2, 2019 by Rajesh Kumar

1. What is OOPS?

2. Write basic concepts of OOPS?

3. What is Encapsulation?

4. What is Polymorphism?

5. What is Inheritance?

6. What is multiple inheritance and does java support?

7. What is an abstraction?

8.What is the difference between abstraction and encapsulation?

9. what is the use of super keyword

10.what is the Advantage of OOPs over Procedure-oriented programming language

11.What is final variable and Use of final variable

12.What is final class - Using final to prevent inheritance?.

13.what is final Method.

14.what is the use of final keyword with Variables?

15.point to be remember keyword final.

17.Can you create a program without main method ?.

what is the 6 usage of this keyword in java?.

16.what is Runtime polymorphism or Dynamic Method Dispatch

What is the difference between static and dynamic binding ?

Can we override the static method?

What is operator overloading?

Why Multiple Inheritance is Not Supported in Java?

How downcasting is possible in java?

What is function overloading?

When to use private constructors in Java?

Can we overload main() method?

Why we need Aggregation?

What is the relationship between a class and an object?

What are access modifiers?

What are the various types of constructors?

What is the difference between constructor and method?

what is the Difference between method Overloading and Overriding?.

Can you declare the main method as final?.

What is difference between abstract class and interface?

what is Java Naming conventions?.

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