Base obj=new Child(); What are the advantage and real life application of above code?

Asked by Last Modified  

25 Answers

Learn Java

Follow 1
Answer

Please enter your answer

Java Trainer

Have you ever observed while communicating with databases? You can find such type of example while writing code from communicating with DB. Connection connectionObject = DriverManager.getConnection(); or Statement simpleStatement = connectionObject.getStatement(); The value of the connectionObject...
read more
Have you ever observed while communicating with databases? You can find such type of example while writing code from communicating with DB. Connection connectionObject = DriverManager.getConnection(); or Statement simpleStatement = connectionObject.getStatement(); The value of the connectionObject variable depends on the database driver you are using (most of the time you load the driver with Class.forName("some driver implementaion")). The answer for your question is, such type of coding helps you to implement and use your own mechanism that suits to your requirements / circumstances. read less
Comments
Dislike Bookmark

You can get all the attributes and behavior of a class by creating its object.
Comments
Dislike Bookmark

Industry expert and professional lecturer/trainer

Dynamic Polymorphism which promotes calling only those methods which parent is aware of. Mostly used in API creation.
Comments
Dislike Bookmark

Tutor

1.It is basis of Polymorphism. 2. Lets say you have a parent class called Animal and child classes called Dog, Cat, and Lizard. Each class has a method call makeSound(). Then when you say Animal a1 = new Dog(); and Animal a2 = new Cat(), a1.makeSound() will bark and a2.makeSound() will meow. The...
read more
1.It is basis of Polymorphism. 2. Lets say you have a parent class called Animal and child classes called Dog, Cat, and Lizard. Each class has a method call makeSound(). Then when you say Animal a1 = new Dog(); and Animal a2 = new Cat(), a1.makeSound() will bark and a2.makeSound() will meow. The technical term for this behavior is called polymorphism. It is useful for code reuse. You only need to write code once for an application that has Animals makeSound() when they are happy, instead of separate code for each animal type. 3.Another use of polymorphism is hiding your code's implementation from other users. For example you can show other users that you are using a List and then you have the choice to implement the List as a LinkedList or as an ArrayList. You can also choose a LinkedList and then at a later time switch to an ArrayList without effecting your users. You also can't say Dog d = new Animal() because a Dog is an Animal but an Animal is not necessarily a Dog. read less
Comments
Dislike Bookmark

Best Training institute for Both Technical and Non Technical domians

This is the most fundamental use of polymorphism because using a parent class reference to refer to a child object is what allows you to take advantage of the benefits of polymorphism. Polymorphism is the ability of an object to take on many forms. The most common use of polymorphism in OOP occurs...
read more
This is the most fundamental use of polymorphism because using a parent class reference to refer to a child object is what allows you to take advantage of the benefits of polymorphism. Polymorphism is the ability of an object to take on many forms. The most common use of polymorphism in OOP occurs when a parent class reference is used to refer to a child class object. read less
Comments
Dislike Bookmark

IT Professional Trainer working with a reputed Institute. Headquarters: Hyderabad

Advantage of method overriding in JAVA The main advantage of method overriding is that the class can give its own specific implementation to a inherited method without even modifying the parent class in JAVA Dynamic method dispatch is a technique which enables us to assign the base class reference...
read more
Advantage of method overriding in JAVA The main advantage of method overriding is that the class can give its own specific implementation to a inherited method without even modifying the parent class in JAVA Dynamic method dispatch is a technique which enables us to assign the base class reference to a child class object. As we see in the code sample that the base class reference is assigned to child class object in JAVA. Base obj=new Child(); read less
Comments
Dislike Bookmark

This is the basis for polymorphism: Imagine you have several child classes that inherit from you parent class. You want to use all these child classes through the interface / methods defined on your parent class, without worrying about the implementation details in each child class (each might do something...
read more
This is the basis for polymorphism: Imagine you have several child classes that inherit from you parent class. You want to use all these child classes through the interface / methods defined on your parent class, without worrying about the implementation details in each child class (each might do something different, but with the same overall semantics). This is possible because the child class has a IS A relationship with its parent class since child inherits from parent. read less
Comments
Dislike Bookmark

B.Tech (EE)

And the source code that follows can be common regardless of whether 'a' is Cat or Dog
Comments
Dislike Bookmark

B.Tech (EE)

Animal a = new Cat(); String s = a.getScientificName(); In the above code, the call to getScientificName() can be used regardless of whether the variable 'a' references a Cat object or a Dog object. So, Base obj = new Chlld(); obj.commonMethod(); // allows using common source code regardless...
read more
Animal a = new Cat(); String s = a.getScientificName(); In the above code, the call to getScientificName() can be used regardless of whether the variable 'a' references a Cat object or a Dog object. So, Base obj = new Chlld(); obj.commonMethod(); // allows using common source code regardless of the Child object being referenced by obj. read less
Comments
Dislike Bookmark

IT Professional Trainer with 15 years of experience in IT Industry

The child class which extends an abstract base class must implement all the abstract methods that are provided in the abstract base class. And the most important point with the abstract classes is that you cannot instantiate them.
Comments
Dislike Bookmark

View 23 more Answers

Related Questions

Is it really needed to do Java training before graduation, to get a job?
Yes, It's must to get better opportunities and to standard alone in IT field. Not only core Java but also learn Spring,Hinernat ,Struts. ANGULARJS add an advantage to get job easily.
Udaybhan
Who can provide good Java training with real-time but not institute?
If you reside in pune then i can provide real time programming in java . So you will get to know industry based java programming
Sridevi
0 0
6
How to handle Circular dependency in Spring?
What I would like to do in this post is suggest 3 possible techniques for dealing with this problem. 1. Refactor your code This is probably the simplest and quickest way to fix this problem. Look at...
Saroj
Where advanced java can be utilized?
Advanced Java is an extension of Java used for developing and running enterprise software and large-scale multi-tiered, scalable, reliable and secure network applications.
Nish

What is meant by Java full stack and angular Java?
Fullstack development means the combination of UI technologies (client-side) + Backend technology (server-side). UI technology like Angular or ReactJs (Front end technologies). It's all about client-side...
Anuradha

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

How to create Rest web services in Java
Web services are web application components that lets two different applications to communicate over the network.Let if an application which in written java provides web services can be communicated through...

Gaurav

0 0
0
Java
Java is a high level language which is far better than procedural languages like C, Fortran and Pascal. Java completely stands with the principles of OOPS (Object Oriented Programming Structure). The...
A

Abhisheak Saxena

0 0
0
Differences Between HashMap vs HashSet In Java.
HashSet HashMap HashSet implements Set interface. HashMap implements Map interface. HashSet stores the data as objects. HashMap stores the data as key-value pairs. HashSet...

Paras Chawla

0 0
0
Java: A Quick Overview
Not purely Object Oriented: It doesn't support multiple inheritence, it supports primitive data types and static members. Doesn’t support multiple inheritance: Reason is diamond problem i.e.,...

Vivek R.

1 0
0
Java Interview Questions & Answers
Java Interview Questions have been designed especially to get you acquainted with the nature of questions you may encounter during your interview for the subject of Java Programming Language. As per my...

Dev Group

2 0
0

Recommended Articles

Why Java is the Most Popular Programming Language

Designed in a flexible and user-friendly demeanor, Java is the most commonly used programming language for the creation of web applications and platform. It allows developers to “write once, run anywhere” (WORA). It is general-purpose, a high-level programming language developed by Sun Microsystem. Initially known as an...

Read full article >

Why Should You Learn Java !

Java is the most famous programming language till date. 20 years is a big time for any programming language to survive and gain strength. Java has been proved to be one of the most reliable programming languages for networked computers. source:techcentral.com Java was developed to pertain over the Internet. Over...

Read full article >

Top 5 Reasons to Learn JavaScript

Before we start on the importance of learning JavaScript, let’s start with a short introduction on the topic. JavaScript is the most popular programming language in the world, precisely it is the language - for Computers, the Web, Servers, Smart Phone, Laptops, Mobiles, Tablets and more. And if you are a beginner or planning...

Read full article >

Java: An Object-Oriented Language

Java is the most commonly used popular programming language for the creation of web applications and platform today. Integrated Cloud Applications and Platform Services Oracle says, “Java developers worldwide has over 9 million and runs approximately 3 billion mobile phones”.  Right from its first implication as java 1.0...

Read full article >

Find Java Training Classes near you
Java Training Classes in Bangalore
Java Training Classes in Hyderabad
Java Training Classes in Pune
Java Training Classes in Chennai
Java Training Classes in Delhi
Java Training Classes in Mumbai
Java Training Classes in Kolkata
Java Training Classes in Noida
Java Training Classes in Gurgaon
Java Training Classes in Ghaziabad
Online Java Training

Looking for Java Training Classes?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you