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jls13
Unboxing Conversion

Java Language Specification, Version Java SE 13 Edition
5.1.8. Unboxing Conversion

Read this Section of the Authoritative Specification

https://docs.oracle.com/javase/specs/jls/se13/html/jls-5.html#jls-5.1.8

2 Documented Misconceptions

Misconception
ReferenceToBooleanCoercion
Every reference type can be coerced to boolean
Misconception
ReferenceToIntegerConversion
One can cast between references and ints

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