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.

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.javatpoint.com › how-to-check-null-in-java

Java Object. In order to check whether a Java object is Null or not, we can either use the isNull () method of the Objects class or comparison operator. Let's take an example to understand how we can use the isNull () method or comparison operator for null check of Java object. NullCheckExample3.java.

https://www.javatpoint.com › java-8-object-null-check

The traditional approach to checking for null values in Java is to use the == operator to compare the reference to null. Here's an example: This approach is straightforward but can be verbose and error-prone, especially when multiple null checks are required.

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://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() .

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

1. Overview. In this quick tutorial, we’ll learn a few different ways to check if a given Integer instance’s value is null or zero. For simplicity, we’re going to use unit test assertions to verify if each approach works as expected. So, next, let’s see them in action. 2. Using the Standard Way.