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並前往https://www.freecodecamp.org/news/a-quick-and-thorough-guide-to-null-what-it-is-and-how-you-should-use-it-d170cea62840/

A quick and thorough guide to 'null' - freeCodeCamp

When should you use null in your source code, and when should you not ... article contains some simple source code examples shown in Java.

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