https://stackoverflow.com › questions › 17302256

Method 4 is my preferred method. The short circuit of the && operator makes the code the most readable. Method 3, Catching NullPointerException, is frowned upon most of the time when a simple null check would suffice.

https://stackoverflow.com › questions › 14721397

StringUtils.isEmpty(String str) - Checks if a String is empty ("") or null. or. StringUtils.isBlank(String str) - Checks if a String is whitespace, empty ("") or null. the latter considers a String which consists of spaces or special characters eg " " empty too. See java.lang.Character.isWhitespace API

https://www.baeldung.com › java-avoid-null-check

Learn several strategies for avoiding the all-too-familiar boilerplate conditional statements to check for null values in Java.

https://www.baeldung.com › java-check-integer-null-or-zero

Learn a few different ways to check if a given Integer instance's value is null or zero.

https://www.baeldung.com › java-array-check-null-empty

In Java, we can check if an array is null or empty by performing two simple checks: null check – using == null Empty check – checking the length property of the array to see if it has zero elements

https://www.baeldung.com › java-check-all-variables-object-null

The simplest way is using a sequence of if statements to check field by field if they are null or not and, in the end, return a combination of their results. Let’s define the allNull() method inside the Car class:

https://betterprogramming.pub › checking-for-nulls-in-java-minimize-using-if-else-edae...

For Map instances : MapUtils.isEmpty() or MapUtils.isNotEmpty() For String : StringUtils.isEmpty() or StringUtils.isNotEmpty() In case of lists, maps etc, isEmpty() checks if the collection/map is null or have size of 0. Similarly for String it checks if the String is null or have length of 0.

https://sebhastian.com › java-is-not-null

To summarize, you can check whether a variable or object is not null in two ways: Using the not equal operator (variable != null) Using the Objects class nonNull() method. Checking for null values before executing further operations will help you to avoid the NullPointerException error.

https://www.javaguides.net › 2024 › 05 › java-check-if-object-is-null-or-empty.html

Checking if an object is null or empty in Java can be accomplished using various methods tailored to different types of objects: For String , use str == null || str.isEmpty() . For Collection , use collection == null || collection.isEmpty() .