abstract class in java with example program

Published: 18 November 2025
on channel: AC IT Room

273

#java #javaprogramming #abstract class
Welcome to today’s video! In this session, we’re diving into one of the core concepts of Java’s object-oriented programming: abstract classes. If you’ve ever wanted a clean way to create a shared structure for different types of objects while still allowing each one to behave uniquely, abstract classes are the perfect tool.

An abstract class is declared using the abstract keyword, and unlike normal classes, you can’t instantiate it directly. Instead, it acts as a blueprint. Inside an abstract class, you can define both abstract methods, which have no implementation and must be overridden, and concrete methods, which already include functionality. This mix gives you flexibility and consistency at the same time.

So why use abstract classes? They help you define a common template, enforce required methods across subclasses, reduce duplicated code, and allow partial implementation where details are left to each subclass.

To visualize this, think of a Payment system with Credit Card and PayPal payments, or a Vehicle system with Cars and Bikes. Each type works differently, yet they share key behaviors—perfect scenarios for abstract classes.

By the end of this video, you’ll understand how abstract classes build cleaner, more organized Java applications.

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