Will null instanceof SomeClass return false or throw a NullPointerException?
Will null instanceof SomeClass return false or throw a NullPointerException ?
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Will null instanceof SomeClass return false or throw a NullPointerException?
No, a null check is not needed before using
instanceof.The expression
x instanceof SomeClassisfalseifxisnull.The Java 11 Language Specification expresses this concisely in section 15.20.2, "Type comparison operator instanceof". (Java 17 expresses this less concisely, after the introduction of
instanceofpattern matching.)So if the operand is null, the result is false.