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並前往https://fullstackdeveloper.guru/2020/06/25/how-to-use-optional-keyword-to-avoid-nullpointerexception-in-nested-objects-in-java/

How to use Optional keyword to avoid NullPointerException in ...

We will see how to do this using pre-Java 8 and post-Java 8 code (using Optional ... If null value is present it returns an empty Optional.

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