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Superclasses and Subclasses

Java Language Specification, Version Java SE 21 Edition
8.1.4. Superclasses and Subclasses

Read this Section of the Authoritative Specification

https://docs.oracle.com/javase/specs/jls/se21/html/jls-8.html#jls-8.1.4

2 Documented Misconceptions

Misconception
ConcreteClassOnlyImplementInterfaceAbstract
A concrete class only needs to implement those abstract methods it inherits from interfaces
Misconception
MultipleSuperclasses
A class can have multiple superclasses

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