Inheritance In Java
Inheritance in Java is a fundamental object-oriented programming concept that allows a new class, known as a subclass or derived class, to inherit properties and behaviors (fields and methods) from an existing class, known as a superclass or base class. This mechanism promotes code reuse and establishes a hierarchical relationship between classes, enabling polymorphism and easier maintenance. In Java, inheritance is implemented using the `extends` keyword, allowing the subclass to access non-private members of the superclass. Java supports single inheritance (a class can inherit from one superclass) and multiple inheritance through interfaces, ensuring that a class can implement behaviors from multiple sources without the ambiguity associated with multiple class inheritance.
To Download Our Brochure: https://www.justacademy.co/download-brochure-for-free
Message us for more information: +91 9987184296
1 - Definition: Inheritance is a fundamental concept in object oriented programming (OOP) that allows one class (subclass or child class) to inherit properties and behaviors (methods) from another class (superclass or parent class).
2) Reusability: Inheritance promotes code reusability, allowing developers to use existing code by inheriting from parent classes, reducing redundancy and improving maintainability.
3) Hierarchical Structure: Inheritance creates a hierarchy of classes. For instance, a base class can have multiple derived classes, forming a tree structure which helps in organizing code logically.
4) Keyword ‘extends’: In Java, the keyword `extends` is used to declare inheritance. For example, `class Dog extends Animal` means Dog is a subclass of Animal.
5) Single Inheritance: Java supports single inheritance, meaning a class can inherit from one superclass only. This helps avoid ambiguity and complexity in class hierarchies.
6) Multilevel Inheritance: Java allows multilevel inheritance, where a class can inherit from another class, which in turn inherits from another class. For example, `class Animal > class Dog > class Puppy`.
7) Interface Inheritance: Java allows a class to implement multiple interfaces. This is different from class inheritance and helps in achieving multiple inheritance in a controlled manner.
8) Method Overriding: Subclasses can override methods of their parent class to provide specific implementations. This enables polymorphism, where a method can behave differently based on the object invoking it.
9) Constructors in Inheritance: Subclasses do not inherit constructors from their parent class. However, the parent class constructor is called implicitly or explicitly from the subclass constructor using `super()`.
10) Access Modifiers: Inheritance respects access modifiers. Public and protected members of the parent class are accessible in the subclass, while private members are not directly accessible.
11) Abstract Classes: An abstract class can be inherited, and it can contain abstract methods that must be implemented by the subclasses, enforcing a contract for the subclasses.
12) Final Classes: If a class is declared as `final`, it cannot be inherited. This is useful to prevent modifications to essential classes in a program.
13) Super Keyword: The `super` keyword is used to refer to the parent class. It can be used to access parent class methods, constructors, or to differentiate between parent and child class members.
14) Polymorphism: Inheritance facilitates polymorphism, allowing a single interface to represent different data types, making code more flexible and extensible.
15) Real World Modeling: Inheritance closely mirrors real world relationships, where a subclass (like a Dog) can be seen as a specific type of a superclass (like an Animal), making it intuitive for developers.
16) Limitation of Inheritance: While inheritance provides several benefits, it can lead to tight coupling between classes and should be used judiciously, favoring composition over inheritance when applicable.
17) Design Patterns: Understanding inheritance is crucial for grasping design patterns such as Template Method, Strategy, and Factory patterns, which rely heavily on class hierarchies and polymorphism.
18) Java API: Inheritance is extensively used in Java APIs where classes like `ArrayList`, `HashMap` etc., extend the `AbstractCollection` or other abstract classes to provide specialized implementations.
These points should give students a solid introduction to inheritance in Java, highlighting its importance and functionality in object oriented design.
Browse our course links : https://www.justacademy.co/all-courses
To Join our FREE DEMO Session: Click Here
Contact Us for more info:
best python course for beginners
I am learning flutter from JustAcademy, They provide very much great environment where people gather and work simultaneously. totally project based training institute.
Awesome Experience. I am a Front-end Web Designer working at Star India for 3 years now. I applied for Full-stack development and my experience has been phenomenal & they really do help with placements exceptionally. Thank you Roshan sir so much.
Flutter app monitoring with Prometheus and Grafana delivers real-time observability by instrumenting the app (via OpenTelemetry or lightweight exporters) to expose metrics that Prometheus scrapes and stores as time-series data. Grafana visualizes those metrics in customizable dashboards and triggers alerts, letting teams track CPU/memory, frame-render times, network latency, error rates and user-impacting regressions. This stack helps quickly detect performance problems, diagnose root causes, and continuously improve app stability and user experience.
Flutter CI with Codemagic is a cloud-first continuous integration and delivery solution that automates building, testing and releasing Flutter apps across iOS, Android and web using configurable workflows (codemagic.yaml), hosted macOS/Linux runners, dependency caching and parallelization. It integrates with GitHub/GitLab/Bitbucket, manages code signing and store publishing, runs unit/widget/integration tests, and generates reproducible artifacts so teams catch regressions early and ship reliably. For learners and professionals working on JustAcademy real-time projects, Codemagic removes the overhead of maintaining CI infrastructure, speeds iteration, and provides a repeatable pipeline for demonstrating and delivering polished app releases.
Using Flutter's Hot UI (hot reload and hot restart) lets developers inject code changes into a running app and see updated layouts, styles and behaviours instantly without losing app state, making it ideal for rapid prototyping. This real-time feedback loop accelerates iteration on widgets, animations and responsive designs, improves collaboration between designers and engineers, and dramatically shortens the path from idea to working MVP.
In 2025, pairing Flutter with Supabase vs Firebase means choosing between an open‑source, Postgres‑first backend and a mature Google serverless platform: Supabase gives Flutter apps SQL‑centric workflows, real‑time subscriptions, row‑level security and lower vendor lock‑in with predictable costs and direct SQL access, while Firebase offers Firestore, Auth, Functions, Analytics, polished SDKs, global scaling and turnkey managed features (offline sync, analytics, A/B testing). Both speed cross‑platform development and real‑time experiences; pick Supabase for relational control and openness, or Firebase for convenience and a broader managed ecosystem.
In 2025, Flutter and NativeScript are both mature cross-platform frameworks with different strengths: Flutter (Dart) compiles to native code and provides a rich, cohesive widget-driven UI, excellent performance, and consistent look across mobile, web and desktop, making it ideal for visually complex apps and teams that want a single expressive UI layer; NativeScript (TypeScript/JavaScript) maps directly to native UI components and gives seamless access to platform APIs, appealing to teams with strong JS/TS skills who need native look-and-feel and tight platform integration—choose Flutter for unified UI control and performance, NativeScript for native parity and easier reuse of web/JS expertise.
Flutter CI/CD with GitHub Actions is a complete tutorial-style guide that shows how to automate building, testing, signing, and deploying Flutter apps using GitHub’s workflow runner; it covers creating YAML workflows to run platform-specific builds (Android/iOS), caching dependencies, running unit/widget/integration tests, managing secrets and code signing, generating artifacts, and releasing to stores or distribution channels. By following the tutorial, developers and JustAcademy learners can enforce consistent quality, catch regressions early, speed up delivery of real-time projects, and adopt industry-standard DevOps practices that make app releases reproducible and reliable.
AI-generated UI in Flutter uses machine learning to convert design files or natural-language prompts into responsive Dart widgets, automating layout, styling, accessibility and cross-platform tweaks so prototypes and production-ready screens can be produced far faster with fewer manual edits; this streamlines collaboration between designers and developers, lets teams focus on business logic and performance, and—as models and tooling improve—will become a core part of development workflows, accelerating app delivery and hands-on learning for learners and professionals at JustAcademy.
Optimizing network calls in Flutter with Dio means using Dio’s rich HTTP client features—centralized configuration and interceptors for headers, auth, logging and error handling; request cancellation, timeouts and concurrency control; retry strategies (exponential backoff); and response caching/compression—to reduce latency, save bandwidth and improve reliability. By encapsulating API logic in a configured Dio instance, applying retries and backoff, caching frequent responses, and handling errors consistently, apps become faster, more resilient and easier to maintain—especially important for real-time project work and production-ready certifications like those at JustAcademy.
JustAcademy’s "Deploy Flutter to Firebase: A Step-by-Step Tutorial" is a concise guide that walks you through preparing a Flutter app, configuring Firebase services (Authentication, Firestore, Hosting), and using the Firebase CLI to build and deploy your app—covering both web hosting and integration for Android/iOS where relevant. It explains creating a Firebase project, adding platform-specific Firebase SDKs, adjusting app settings, running production builds, initializing Firebase Hosting, and performing the final deploy, with tips for testing and automating releases via CI/CD. By following the tutorial, developers get a practical, end-to-end workflow to ship scalable, real-time Flutter apps quickly and reliably.
Flutter Desktop keyboard shortcuts let you define and handle platform-consistent key bindings (like Ctrl/Cmd combinations) to trigger app commands without a mouse. Using Flutter’s Shortcuts, Actions, and Intents APIs (or lower-level RawKeyboard events), you map logical key sets to intent objects and implement actions that run when those intents are invoked, while respecting focus and accessibility so shortcuts work predictably across Windows, macOS, and Linux.
