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Java provides several foundational mechanisms for abstraction, encapsulation, and functional programming. Understanding how abstract classes, nested classes, wrapper types, interfaces, and lambda expressions interrelate is essential for writing robust, maintainable, and expressive object-oriented code. Abstract Classes: Blueprint with Shared Lo ...

The Concept of Polymorphism Polymorphism describes the ability of different objects to respond uniquely to the same method call. When distinct objects perform an identical action, the outcome varies according to their concrete types. For instance, invoking a vocalize method returns a bark for a Dog instance but a meow for a Cat instance. Core M ...

Class Inheritance in Java 1.1 Implementing Inheritance Inheritance enables code reuse and establishes an "is-a" relationship between classes. A subclass inherits accessible members (fields and methods) from its superclass using the extends keyword. class Vehicle { protected String brand = "Generic"; public void st ...