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javatypeslanguage-lawyerjlssubtyping
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Reputation: 139

Is the Java null type a subtype of all primitive types?

The Java Language Specification 20, Section 4.10. Subtyping states that

The subtypes of a type T are all types U such that T is a supertype of U, and the null type. We write T <: S to indicate that that the subtype relation holds between types T and S.

Does this mean, that the null type is a subtype of all primitive types? And if yes, are there any practical consequences?

I'm writing a library to parse and analyze java code, so should I treat null as a subtype of, say, int? Or does it not matter at all?

Upvotes: 5

Views: 150

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