Allow Only One Null Property

Allow Only One Null Property

Consider a Review object with three properties: article, book and magazine. Let’s assume that only one of these three properties should be set as non-null.

For checking this constraint we can rely on Stream API as below:

return Stream.of(review.getBook(), review.getArticle(), review.getMagazine())    .filter(Objects::nonNull)    .count() == 1;

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