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Tip: Avoid NPE via JDK 8, Optional

Beginning with JDK 8, you can avoid NullPointerException by returning an Optional. See an example.


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Starting with JDK 8, you can avoid NullPointerException by returning an Optional. For example, instead of returning null, this method returns an empty Optional:

public Optional fetchShoppingCart(long id) {

    ShoppingCart cart = // code that fetch the card content for the specified id

    return Optional.ofNullable(cart);
} 

 

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Octavia Andreea Anghel is a senior PHP developer currently working as a primary trainer for programming teams that participate at national and international software-development contests. She consults on developing educational projects at a national level. She is a coauthor of the book "XML Technologies--XML in Java" (Albastra, ISBN 978-973-650-210-1), for which she wrote the XML portions. In addition to PHP and XML, she's interested in software architecture, web services, UML, and high-performance unit tests.
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