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jls13
Abstract Classes

Java Language Specification, Version Java SE 13 Edition
8.1.1.1. Abstract Classes

Read this Section of the Authoritative Specification

https://docs.oracle.com/javase/specs/jls/se13/html/jls-8.html#jls-8.1.1.1

1 Documented Misconceptions

Misconception
ConcreteClassMustOverride
A concrete class needs to implement all abstract methods and override all concrete methods declared in its abstract superclasses

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