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並前往https://codeburst.io/replace-your-if-else-if-nested-if-not-null-then-get-blocks-with-java-8-optional-s-ed9695a6331e

Replace your if..else if…/ nested if-not-null -then-get blocks ...

checkN are homogeneous checks on obj returning Optional of same type or empty Optional instead of null.*/. Or, more elegantly on Java 9 onward as:

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