Java
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Why this exists The earlier Classes, Objects, Interfaces, Enums and Records page shows how to define a class. Real Java code, and the frameworks you run (Spring, Jenkins plugins, Tomcat, Kafka clients), is built from…
Java Basics: Inheritance, Abstract Classes, Interfaces, Polymorphism and Access Modifiers
How classes relate: extends and super, abstract classes, interfaces with default methods, method overriding and why @Override matters, private versus protected versus public, and polymorphism, with real compiler errors for the classic mistakes.
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