6 Tips to Avoid NullPointerException in Java

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One of the most common errors faced by Java programmers is the NullPointerException, which can cause applications to crash unexpectedly and negatively impact the user experience.

NullPointerException is a class in the java.lang package that extends RuntimeException. The primary cause of this error is attempting to access null references. Identifying and preventing such errors allows developers to make their code more reliable and maintainable. In this article, we will explore effective ways to avoid NullPointerException and provide some practical tips to help you prevent this error.

These examples are written with the goal of “advancing without getting a NullPointer through code.” In professional life, especially in large and complex services, we may have to follow this logic. I have tried to compile the information I needed based on my own experiences here, and I hope you find it useful. Enjoy the article!

Why do we encounter it frequently?

In Java, the default value for reference type variables is null.

When we declare an object at the beginning of a method or class without instantiating it, its default value will be null…