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://stackabuse.com › java-check-if-string-is-null-empty-or-blank

In this tutorial, we'll take a look at how to check if a String is null, empty or blank in Java, using String.isEmpty (), String.equals () and Apache Commons, with examples.

https://www.baeldung.com › java-blank-empty-strings

There are several ways to check whether a string is empty or not. Often, we also want to check if a string is blank, meaning that it consists of only whitespace characters. The most convenient way is to use Apache Commons Lang, which provides helpers such as StringUtils.isBlank.

https://www.baeldung.com › java-string-isempty-vs-isblank

In this tutorial, we’ve seen the differences between the isBlank () vs. isEmpty (). The critical difference is that isBlank () returns true for whitespace characters, like some escape sequences. On the other hand, isEmpty () only returns true when the String doesn’t contain any character.

https://www.baeldung.com › java-string-null-vs-empty

In essence, null represents the absence of any value, whereas an empty String represents a valid String. The empty String has some value whose length is zero. As usual, the source code for all the examples can be found over on GitHub. Learn how "null" and empty strings behave in different scenarios.

https://codegym.cc › groups › posts › java-check-if-string-is-null-empty-or-blank

In Java, a built-in method is available to check if a String is empty before performing any operations. If you don’t want to use this available method, alternatively you can check if the length of the String is zero. It will do the job for you.

https://www.programiz.com › java-programming › examples › string-empty-null

In this program, you'll learn to check if a string is empty or null using a method and the if-else statement in Java.

https://www.tutorialsfreak.com › java-tutorial › examples › string-null-check

Learn 5 effective ways to perform a string null check in Java. Understand how to handle empty or null strings with practical code examples in this tutorial.

https://stackoverflow.com › questions › 23419087

StringUtils.isEmpty() returns true when there is no charsequence in the String parameter or when String parameter is null. Difference is that isEmpty() returns false if String parameter contains just whiltespaces. It considers whitespaces as a state of being non empty.

https://www.w3schools.com › java › ref_string_isempty.asp

The isEmpty() method checks whether a string is empty or not. This method returns true if the string is empty (length() is 0), and false if not.