Java abstract class & abstract methods

Jan 13, 2017Download as PPTX, PDF8 likes9,500 views

Java abstract class & abstract methods,Abstract class in java Abstract classes are classes that contain one or more abstract methods. An abstract method is a method that is declared, but contains no implementation. Abstract classes may not be instantiated, and require subclasses to provide implementations for the abstract methods.

 A class which contains the abstract keyword in its
declaration is known as abstract class.
 Abstract classes may or may not contain abstract
methods, i.e., methods without body ( public void
get(); )
 But, if a class has at least one abstract method, then
the class must be declared abstract.
 If a class is declared abstract, it cannot be
instantiated.
 To use an abstract class, you have to inherit it from
another class, provide implementations to the
abstract methods in it.
 If you inherit an abstract class, you have to provide
implementations to all the abstract methods in it.

Example of Abstract Class
public abstract class Employee
{
private String name;
private String address;
public Employee(String name, String address, int number)
{
System.out.println("Constructing an Employee");
this.name = name;
}
public double computePay()
{
System.out.println("Inside Employee computePay");
return 0.0;
}
}

$Now lets try to instantiate the Employee class in the following way − public class AbstractDemo { public static void main(String [] args) { Employee e = new Employee("George W.“); System.out.println("n Call Employee "); e.mailCheck(); } } Employee.java:46: Employee is abstract; cannot be instantiated Employee e = new Employee("George W”); ^ 1 error$

If you want a class to contain a particular method
but you want the actual implementation of that
method to be determined by child classes, you
can declare the method in the parent class as an
abstract.
 abstract keyword is used to declare the method
as abstract.
 You have to place the abstract keyword before
the method name in the method declaration.
 An abstract method contains a method signature,
but no method body.
 Instead of curly braces, an abstract method will
have a semoi colon (;) at the end.

Following is an example of the abstract method.
Declaring a method as abstract has two
consequences −
 The class containing it must be declared as
abstract.
 Any class inheriting the current class must
either override the abstract method or declare
itself as abstract.
public abstract class Employee
{
private String name;
public abstract double computePay();
}

Suppose Salary class inherits the Employee
class, then it should implement computePay()
public class Salary extends Employee
{
private double salary;
double computePay()
{
System.out.println("Computing salary " +
getName());
return salary/52;
}
}

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Generative Artificial Intelligence (GenAI) in BusinessDr. Tathagat Varma

IEDM 2024 Tutorial2_Advances in CMOS Technologies and Future Directions for C...organizerofv

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Technology Trends in 2025: AI and Big Data AnalyticsInData Labs

At InData Labs, we have been keeping an ear to the ground, looking out for AI-enabled digital transformation trends coming our way in 2025. Our report will provide a look into the technology landscape of the future, including: -Artificial Intelligence Market Overview -Strategies for AI Adoption in 2025 -Anticipated drivers of AI adoption and transformative technologies -Benefits of AI and Big data for your business -Tips on how to prepare your business for innovation -AI and data privacy: Strategies for securing data privacy in AI models, etc. Download your free copy nowand implement the key findings to improve your business.

HCL Nomad Web – Best Practices and Managing Multiuser Environmentspanagenda

Webinar Recording: https://www.panagenda.com/webinars/hcl-nomad-web-best-practices-and-managing-multiuser-environments/ HCL Nomad Web is heralded as the next generation of the HCL Notes client, offering numerous advantages such as eliminating the need for packaging, distribution, and installation. Nomad Web client upgrades will be installed “automatically” in the background. This significantly reduces the administrative footprint compared to traditional HCL Notes clients. However, troubleshooting issues in Nomad Web present unique challenges compared to the Notes client. Join Christoph and Marc as they demonstrate how to simplify the troubleshooting process in HCL Nomad Web, ensuring a smoother and more efficient user experience. In this webinar, we will explore effective strategies for diagnosing and resolving common problems in HCL Nomad Web, including - Accessing the console - Locating and interpreting log files - Accessing the data folder within the browser’s cache (using OPFS) - Understand the difference between single- and multi-user scenarios - Utilizing Client Clocking

Transcript: #StandardsGoals for 2025: Standards & certification roundup - Tec...BookNet Canada

Book industry standards are evolving rapidly. In the first part of this session, we’ll share an overview of key developments from 2024 and the early months of 2025. Then, BookNet’s resident standards expert, Tom Richardson, and CEO, Lauren Stewart, have a forward-looking conversation about what’s next. Link to recording, presentation slides, and accompanying resource: https://bnctechforum.ca/sessions/standardsgoals-for-2025-standards-certification-roundup/ Presented by BookNet Canada on May 6, 2025 with support from the Department of Canadian Heritage.

HCL Nomad Web – Best Practices und Verwaltung von Multiuser-Umgebungenpanagenda

Webinar Recording: https://www.panagenda.com/webinars/hcl-nomad-web-best-practices-und-verwaltung-von-multiuser-umgebungen/ HCL Nomad Web wird als die nächste Generation des HCL Notes-Clients gefeiert und bietet zahlreiche Vorteile, wie die Beseitigung des Bedarfs an Paketierung, Verteilung und Installation. Nomad Web-Client-Updates werden “automatisch” im Hintergrund installiert, was den administrativen Aufwand im Vergleich zu traditionellen HCL Notes-Clients erheblich reduziert. Allerdings stellt die Fehlerbehebung in Nomad Web im Vergleich zum Notes-Client einzigartige Herausforderungen dar. Begleiten Sie Christoph und Marc, während sie demonstrieren, wie der Fehlerbehebungsprozess in HCL Nomad Web vereinfacht werden kann, um eine reibungslose und effiziente Benutzererfahrung zu gewährleisten. In diesem Webinar werden wir effektive Strategien zur Diagnose und Lösung häufiger Probleme in HCL Nomad Web untersuchen, einschließlich - Zugriff auf die Konsole - Auffinden und Interpretieren von Protokolldateien - Zugriff auf den Datenordner im Cache des Browsers (unter Verwendung von OPFS) - Verständnis der Unterschiede zwischen Einzel- und Mehrbenutzerszenarien - Nutzung der Client Clocking-Funktion

What is Model Context Protocol(MCP) - The new technology for communication bw...Vishnu Singh Chundawat

The MCP (Model Context Protocol) is a framework designed to manage context and interaction within complex systems. This SlideShare presentation will provide a detailed overview of the MCP Model, its applications, and how it plays a crucial role in improving communication and decision-making in distributed systems. We will explore the key concepts behind the protocol, including the importance of context, data management, and how this model enhances system adaptability and responsiveness. Ideal for software developers, system architects, and IT professionals, this presentation will offer valuable insights into how the MCP Model can streamline workflows, improve efficiency, and create more intuitive systems for a wide range of use cases.

Noah Loul Shares 5 Steps to Implement AI Agents for Maximum Business Efficien...Noah Loul

Artificial intelligence is changing how businesses operate. Companies are using AI agents to automate tasks, reduce time spent on repetitive work, and focus more on high-value activities. Noah Loul, an AI strategist and entrepreneur, has helped dozens of companies streamline their operations using smart automation. He believes AI agents aren't just tools—they're workers that take on repeatable tasks so your human team can focus on what matters. If you want to reduce time waste and increase output, AI agents are the next move.

Role of Data Annotation Services in AI-Powered ManufacturingAndrew Leo

Andrew Marnell: Transforming Business Strategy Through Data-Driven InsightsAndrew Marnell