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並前往https://www.quora.com/In-Java-how-do-you-check-a-long-for-null

In Java, how do you check a long for null? - Quora

A long (small L) is a primitive. It can't be null. · A Long (capital L) is an object and can be null. You can check it with the ==null check. · With autoboxing, ...

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