java isblank null - Brave Search

StringUtils.isBlank() vs String.isEmpty()

stackoverflow.com › questions › 23419087 › stringutils-isblank-vs-string-isempty

StringUtils.isBlank() checks that each character of the string is a whitespace character (or that the string is empty or that it's null). This is totally different than just checking if the string is empty.

From the linked documentation:

Checks if a String is whitespace, empty ("") or null.

 StringUtils.isBlank(null)      = true
 StringUtils.isBlank("")        = true  
 StringUtils.isBlank(" ")       = true  
 StringUtils.isBlank("bob")     = false  
 StringUtils.isBlank("  bob  ") = false

For comparison StringUtils.isEmpty:

 StringUtils.isEmpty(null)      = true
 StringUtils.isEmpty("")        = true  
 StringUtils.isEmpty(" ")       = false  
 StringUtils.isEmpty("bob")     = false  
 StringUtils.isEmpty("  bob  ") = false

Warning: In java.lang.String.isBlank() and java.lang.String.isEmpty() work the same except they don't return true for null.

java.lang.String.isBlank() (since Java 11)

java.lang.String.isEmpty()

Answer from arshajii on Stack Overflow

baeldung.com › home › java › java string › checking for empty or blank strings in java

Checking for Empty or Blank Strings in Java | Baeldung

January 8, 2024 - Like Guava, it won’t check if a string only contains whitespace but checks whether a given string is null or empty. There are several ways to check whether a string is empty or not.

medium.com › @lp.lok.payu › isempty-vs-empty-vs-isblank-vs-isnull-12aea580fe4b

isEmpty() vs empty() vs isBlank() vs isNull() | by leela prasad | Medium

February 16, 2025 - String str = " "; if (str.isBlank()) { System.out.println("String is blank"); } Checks if the value is null, empty, or contains only whitespace characters. ... Returns true if the string is null, empty, or only whitespace.

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isEmpty vs isBlank in #java string - YouTube

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January 4, 2024

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stackoverflow.com › questions › 23419087 › stringutils-isblank-vs-string-isempty

java - StringUtils.isBlank() vs String.isEmpty() - Stack Overflow

StringUtils.isBlank() checks that each character of the string is a whitespace character (or that the string is empty or that it's null). This is totally different than just checking if the string is empty.

From the linked documentation:

Checks if a String is whitespace, empty ("") or null.

 StringUtils.isBlank(null)      = true
 StringUtils.isBlank("")        = true  
 StringUtils.isBlank(" ")       = true  
 StringUtils.isBlank("bob")     = false  
 StringUtils.isBlank("  bob  ") = false

For comparison StringUtils.isEmpty:

 StringUtils.isEmpty(null)      = true
 StringUtils.isEmpty("")        = true  
 StringUtils.isEmpty(" ")       = false  
 StringUtils.isEmpty("bob")     = false  
 StringUtils.isEmpty("  bob  ") = false

Warning: In java.lang.String.isBlank() and java.lang.String.isEmpty() work the same except they don't return true for null.

java.lang.String.isBlank() (since Java 11)

java.lang.String.isEmpty()

The accepted answer from @arshajii is totally correct. However just being more explicit by saying below,

StringUtils.isBlank()

 StringUtils.isBlank(null)      = true
 StringUtils.isBlank("")        = true  
 StringUtils.isBlank(" ")       = true  
 StringUtils.isBlank("bob")     = false  
 StringUtils.isBlank("  bob  ") = false

StringUtils.isEmpty

 StringUtils.isEmpty(null)      = true
 StringUtils.isEmpty("")        = true  
 StringUtils.isEmpty(" ")       = false  
 StringUtils.isEmpty("bob")     = false  
 StringUtils.isEmpty("  bob  ") = false

reddit.com › r/askprogramming › in java, should i use (string ) isempty() or isblank() when checking an xml object for an empty value?

r/AskProgramming on Reddit: In Java, should I use (String ) isEmpty() or isBlank() when checking an XML object for an empty value?

September 26, 2022 -

I have some config file and it is deployed in many regions. Some regions have certain requirements for example lets say one region needed a username and password (basic auth). The current setup is that each deployment has it's own config file and only the instances where it is needed are these values included in the respective config.xml file.

So I have in my Java code some logic that says

'if this element is in the XML, set the corresponding variable with its value, if not do nothing'

So when I'm trying to see if that value is present or if the tag is empty/blank, which String utility should I use to check?

example code (default option left open as empty string):

if (my_config.getString(USER_ID_ELEMENT, "") != null
    & my_config.getString(PASSWORD_ELEMENT, "") != null) {
		my_userId = m_config.getString(USER_ID_ELEMENT, "");
		my_password = m_config.getString(PASSWORD_ELEMENT, "");

Here I'm checking if it is not null, but I don't think it's a very good test since I don't know if an empty XML tag is blank or is empty (i think null isn't even an option)?

What behavior do you want if the xml parser emits " " as the config value?

Blank and empty are not the same thing. Empty means "" and only "". Blank means "", " ", " ", and so on. Which you use depends on your use case, but usually its safest to go with isBlank combined with a null check.

educative.io › answers › what-is-stringutilsisblank-in-java

What is StringUtils.isBlank in Java?

If a string satisfies any of the criteria below, then the string is considered to be blank: The length of the string is zero or the string is empty. The string points to a null reference.

stackoverflow.com › questions › 33887991 › stringutils-isblank-return-false-for-null-strings

java - StringUtils.isBlank return false for null Strings - Stack Overflow

I also had this problem and found the trick just after saw the source code of String.valueof(). The source code of String.valueof() is below.

public static String valueOf(Object obj) {
    return (obj == null) ? "null" : obj.toString();
}

Therefore when you pass a null object, you will get a 'null' String. Therefore your StringUtils.isBlank() will treat is as a String rather than a null object and you will get a 'false' booean value.

Hope it helps.!

I tested those code and they give the same result.

 Boolean isBlank = StringUtils.isBlank("");
 System.out.println(isBlank);// give true

and

 Boolean isBlank = StringUtils.isBlank(null);
 System.out.println(isBlank);// give true

baeldung.com › home › java › java string › difference between string isempty() and isblank()

Difference Between String isEmpty() and isBlank() | Baeldung

December 2, 2025 - Additionally, the escape sequences \t, \n, \r, \f, and \s are considered whitespace characters, so only isBlank() returns true. In contrast, isEmpty() returns false for all of them. Finally, for any other character different from the ones shown in the table, both methods return false. Before Java 11, developers typically used the combination of String.trim() and String.isEmpty() to validate that a text contains only whitespace characters.

docs.vultr.com › java › examples › check-if-a-string-is-empty-or-null

Java Program to Check if a String is Empty or Null | Vultr Docs

December 17, 2024 - Here, StringUtils.isBlank() checks if str is null, empty, or made solely of whitespace (spaces, tabs, new line characters). Very useful when the mere presence of whitespace should also classify the string as "empty".

Find elsewhere

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medium.com › @AlexanderObregon › javas-string-isblank-method-explained-be7064a144a7

Java’s String.isBlank() Method Explained | Medium

January 10, 2025 - With isBlank(), these checks are more direct. Consider the traditional way of validating a string for meaningful content: if (input == null || input.trim().isEmpty()) { System.out.println("Invalid input"); } With isBlank(): if (input == null || input.isBlank()) { System.out.println("Invalid input"); } Benefits of using isBlank() in conditional logic: Fewer manual steps such as trimming or chaining conditions.

geeksforgeeks.org › java › java-string-isblank-method

Java String isBlank() Method - GeeksforGeeks

July 23, 2025 - Example 3: This example shows how to use isBlank() with conditional logic to handle blank inputs in an application. ... // Java program to use isBlank() with conditional logic public class StringIsBlank { public static void main(String[] args) { // String with spaces String s = " "; // Check if the message is blank if (s.isBlank()) { System.out.println("The message is blank."); } else { System.out.println("Message: " + s); } } }

codegym.cc › java blog › strings in java › java: check if string is null, empty or blank

Java: Check if String is Null, Empty or Blank

October 11, 2023 - " + myName.isBlank()); myName = myName.concat("Lubaina Khan"); if (!myName.isEmpty()) { System.out.println("The String = " + myName); } } } The String = Is the String null? false Is the String empty? false Is the String blank? true The String = Lubaina Khan · Here was a quick run down on how a null, empty and blank Strings can be spotted and checked in Java.

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

Java: Check if String is Null, Empty or Blank

February 28, 2023 - String string = "Hello there"; if (string == null || string.equals("") || string.trim().equals("")) System.out.println("String is null, empty or blank"); else System.out.println("String is neither null, empty nor blank"); In much the same fashion as the before, if the trimmed string is "", it was either empty from the get-go, or was a blank string with 0..n whitespaces: ... The Apache Commons is a popular Java library that provides further functionality.

sumologic.com › log search › search query language › search operators › isnull, isempty, isblank

isNull, isEmpty, isBlank Search Operators | Sumo Logic Docs

The isEmpty operator checks if a string contains no characters and is only whitespace. The isBlank operator checks if a string contains no characters, is only whitespace, and is null.

tutorialspoint.com › Checking-for-Null-or-Empty-in-Java

Checking for Null or Empty in Java.

The following is an example of ... } } } ... The string is not empty. We can check whether a particular String is empty or not, using the isBlank() method of the StringUtils class....

tutorialspoint.com › home › java/lang › java string isblank method

Java String isBlank Method

September 1, 2008 - The given string is: TutorialsPoint The string length is: 14 The isBlank() method returns: false The string is not a blank string. If the given string value is a null, this method throws a NullPointerException.

oreilly.com › library › view › jakarta-commons-cookbook › 059600706X › ch02s03.html

2.2. Checking for an Empty String - Jakarta Commons Cookbook [Book]

November 16, 2004 - You need to test for an empty or null string. Use StringUtils.isBlank() . This method will return true if it is supplied with an empty, zero length, or whitespace-only string. This method gracefully handles a null input by returning true.

Author Timothy M. O'Brien

Published 2004

Pages 400

howtodoinjava.com › home › java 11 › java string isblank() – check blank or empty string

Java String isBlank() - Check Blank or Empty String

December 12, 2022 - The isBlank() method has been added in Java 11. To check if a given string does not have even blank spaces, use String.isEmpty() method. It returns true if the given string is empty or contains only white space code points, otherwise false. It uses Character.isWhitespace(char) method to determine a white space character.

ioflood.com › blog › stringutils-isempty

StringUtils.isEmpty() in Java: Your Method Guide

March 27, 2024 - Understanding the difference between null and empty strings is crucial when working with StringUtils.isEmpty, as this method checks for both conditions. It returns true if the string is either null or empty, and false otherwise. StringUtils.isEmpty plays a crucial role in string manipulation tasks in Java applications.

stackoverflow.com › questions › 14721397 › checking-if-a-string-is-empty-or-null-in-java

Checking if a string is empty or null in Java - Stack Overflow

Correct way to check for null or empty or string containing only spaces is like this:

if(str != null && !str.trim().isEmpty()) { /* do your stuffs here */ }

You can leverage Apache Commons StringUtils.isEmpty(str), which checks for empty strings and handles null gracefully.

Example:

System.out.println(StringUtils.isEmpty("")); // true
System.out.println(StringUtils.isEmpty(null)); // true

Google Guava also provides a similar, probably easier-to-read method: Strings.isNullOrEmpty(str).

Example:

System.out.println(Strings.isNullOrEmpty("")); // true
System.out.println(Strings.isNullOrEmpty(null)); // true

commons.apache.org › proper › commons-lang › apidocs › org › apache › commons › lang3 › StringUtils.html

StringUtils (Apache Commons Lang 3.20.0 API)

Operations on String that are null safe. IsEmpty/IsBlank - checks if a String contains text