Over a million developers have joined DZone.
{{announcement.body}}
{{announcement.title}}

Checking for Null Values in Java with Objects.requiresNonNull()

DZone's Guide to

Checking for Null Values in Java with Objects.requiresNonNull()

· Java Zone
Free Resource

Learn how to stop testing everything every sprint and only test the code you’ve changed. Brought to you by Parasoft.

Checking method/constructor parameters for null values is a common  task  problem in Java. To assist you with this, various Java libraries provide validation utilities (see Guava PreconditionsCommons LangValidate or Spring's Assert documentation).
However, if you only want to validate for non null values you can use the static requiresNonNull()method of java.util.Objects. This is a little utility introduced by Java 7 that appears to be rarely known.

With Objects.requiresNonNull() the following piece of code

public void foo(SomeClass obj) {
	if (obj == null) {
		throw new NullPointerException("obj must not be null");
	}
	// work with obj
}

can be replaced with:

import java.util.Objects;

public void foo(SomeClass obj) {
	Objects.requireNonNull(obj, "obj must not be null");
	// work with obj
}


Get the top tips for Java developers and best practices to overcome common challenges. Brought to you by Parasoft.

Topics:

Published at DZone with permission of Michael Scharhag, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}