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jls21
Subtyping
Java Language Specification, Version Java SE 21 Edition
4.10. Subtyping
Read this Section of the Authoritative Specification
https://docs.oracle.com/javase/specs/jls/se21/html/jls-4.html#jls-4.10
2 Documented Misconceptions
SubtypeCompatibleWithSupertype
A variable of a subtype can reference an object of a supertype
SupertypeIncompatibleWithSubtype
A variable of a supertype cannot reference an object of a subtype
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