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並前往https://www.hackerearth.com/practice/notes/tired-of-null-pointer-exceptions-consider-using-java-se-8s-optional/

Tired of Null Pointer Exceptions? Consider ... - HackerEarth

By the end of this article, you will understand how to use Optional, as shown below, to rewrite the code in Listing 1 that was doing several nested null checks:

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