java.lang does not contain a class called StringUtils. Several third-party libs do, such as Apache Commons Lang or the Spring framework. Make sure you have the relevant jar in your project classpath and import the correct class.

Answer from Jonik on Stack Overflow
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GeeksforGeeks
geeksforgeeks.org › java › string-handling-with-apache-commons-stringutils-class-in-java
String Handling with Apache Commons' StringUtils Class in Java - GeeksforGeeks
April 28, 2025 - Run a Maven build to download the dependency and add it to your project's classpath. Import the StringUtils class in your Java code.
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Apache Commons
commons.apache.org › proper › commons-lang › jacoco › org.apache.commons.lang3 › StringUtils.java.html
StringUtils.java
* * <p>Specifically:</p> * <ul> * <li>If the number of characters in {@code str} is less than or equal to * {@code maxWidth}, return {@code str}.</li> * <li>Else abbreviate it to {@code (substring(str, 0, max-3) + "...")}.</li> * <li>If {@code maxWidth} is less than {@code 4}, throw an * {@link IllegalArgumentException}.</li> * <li>In no case will it return a String of length greater than * {@code maxWidth}.</li> * </ul> * * <pre> * StringUtils.abbreviate(null, *) = null * StringUtils.abbreviate("", 4) = "" * StringUtils.abbreviate("abcdefg", 6) = "abc..."
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Medium
medium.com › @vino7tech › useful-stringutils-methods-in-java-833dc5236f0a
Useful StringUtils Methods in Java | by Vinotech | Medium
September 29, 2024 - Apache Commons Lang (org.apache.commons.lang3.StringUtils): A widely used library that offers a robust set of methods for string manipulation.
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Spring
docs.spring.io › spring-framework › docs › current › javadoc-api › org › springframework › util › StringUtils.html
StringUtils (Spring Framework 7.0.5 API)
Mainly for internal use within the framework; consider Apache's Commons Lang for a more comprehensive suite of String utilities · This class delivers some simple functionality that should really be provided by the core Java String and StringBuilder classes. It also provides easy-to-use methods ...
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Educative
educative.io › answers › what-is-stringutilsright-in-java
What is StringUtils.right() in Java?
import org.apache.commons.lang3.StringUtils; public static String right(final String str, final int len) final String str: The string to get the rightmost characters from. final int len: The length of the rightmost characters to extract from ...
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AWS
docs.aws.amazon.com › AWSJavaSDK › latest › javadoc › com › amazonaws › util › StringUtils.html
StringUtils (AWS SDK for Java - 1.12.797)
com.amazonaws.util.StringUtils · public class StringUtils extends Object · Utilities for converting objects to strings. equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait · public static final String COMMA_SEPARATOR · See Also: Constant Field Values ·
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Apache Commons
commons.apache.org › proper › commons-codec › apidocs › org › apache › commons › codec › binary › StringUtils.html
StringUtils (Apache Commons Codec 1.21.0 API)
StringUtils() Deprecated. TODO Make private in 2.0. All MethodsStatic MethodsConcrete Methods · Modifier and Type · Method · Description · static boolean · equals · (CharSequence cs1, CharSequence cs2) Compares two CharSequences, returning true if they represent equal sequences of characters.
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Experts Exchange
experts-exchange.com › questions › 29223133 › How-can-I-import-StringUtils-difference-into-my-Java-code.html
Solved: How can I import "StringUtils.difference" into my Java code | Experts Exchange
August 26, 2021 - import org.apache.commons.lang3.*; public class Difference { public static void main(String[] args) { try { System.out.println(StringUtils.difference(args[0], args[1])); } catch(Throwable t) { t.printStackTrace(); } } }
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Oracle
docs.oracle.com › cd › E55783_02 › Platform.11-2 › apidoc › atg › core › util › StringUtils.html
StringUtils (ATG Java API)
atg.core.util.StringUtils · public class StringUtils extends java.lang.Object · This class contains static methods for performing various operations on Strings.
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O'Reilly
oreilly.com › library › view › jakarta-commons-cookbook › 059600706X › ch02s02.html
2.1. Setting Up StringUtils and WordUtils - Jakarta Commons Cookbook [Book]
November 16, 2004 - import org.apache.commons.lang.StringUtils; import org.apache.commons.lang.WordUtils;
Author   Timothy M. O'Brien
Published   2004
Pages   400
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JavaBeat
javabeat.net › home › how to use stringutils class in java
How to Use StringUtils Class in Java
March 8, 2024 - The StringUtils class offers several methods to check if a string contains numbers, whitespaces, Unicode characters, etc. The below table demonstrates these methods with description and syntax: The given code block creates a numeric string and applies the above-mentioned methods to show how they work: import org.apache.commons.lang3.StringUtils; public class ExampleClass { public static void main(String[] args) { String numString = "123910"; System.out.println("Result of isNumeric Method ==> " + StringUtils.isNumeric(numString)); System.out.println("Result of isNumericSpace Method ==> " + StringUtils.isNumericSpace(numString)); System.out.println("Result of isAlpha Method ==> " + StringUtils.isAlpha(numString)); System.out.println("Result of isAsciiPrintable Method ==> " + StringUtils.isAsciiPrintable(numString)); } }
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W3Schools
w3schools.com › java › java_strings.asp
W3Schools.com
assert abstract boolean break byte case catch char class continue default do double else enum exports extends final finally float for if implements import instanceof int interface long module native new package private protected public return requires short static super switch synchronized this throw throws transient try var void volatile while Java String Methods
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Apache Commons
commons.apache.org › proper › commons-lang › apidocs › src-html › org › apache › commons › lang3 › StringUtils.html
StringUtils.isBlank - Source code - Apache Software Foundation
ads a String</li> 077 * <li><strong>UpperCase/LowerCase/SwapCase/Capitalize/Uncapitalize</strong> 078 * - changes the case of a String</li> 079 * <li><strong>CountMatches</strong> 080 * - counts the number of occurrences of one String in another</li> 081 * <li><strong>IsAlpha/IsNumeric/IsWhitespace/IsAsciiPrintable</strong> 082 * - checks the characters in a String</li> 083 * <li><strong>DefaultString</strong> 084 * - protects against a null input String</li> 085 * <li><strong>Rotate</strong> 086 * - rotate (circular shift) a String</li> 087 * <li><strong>Reverse/ReverseDelimited</strong> 088
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Quora
quora.com › How-come-I-cant-import-org-apache-commons-lang-StringUtils
How come I can't import org.apache.commons.lang. ...
Answer: Have you double-checked the path the Jar file is located in, and have you relocated the project at some stage? For demo purposes, I'll download it and put it in a mock NetBeans project... 1. Download the needed Jar file from Download Apache Commons Lang 2. Locate the downloaded archive, ...
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Baeldung
baeldung.com › home › java › java string › an introduction to apache commons lang 3
An Introduction to Apache Commons Lang 3 | Baeldung
January 8, 2024 - As its name suggests, StringUtils allows us to perform a bunch of null-safe strings operations that complement/extend the ones that java.lang.String provides out of the box.
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Python
docs.python.org › 3 › library › string.html
string — Common string operations
>>> from string import Template >>> s = Template('$who likes $what') >>> s.substitute(who='tim', what='kung pao') 'tim likes kung pao' >>> d = dict(who='tim') >>> Template('Give $who $100').substitute(d) Traceback (most recent call last): ... ValueError: Invalid placeholder in string: line 1, col 11 >>> Template('$who likes $what').substitute(d) Traceback (most recent call last): ...
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Maven Repository
mvnrepository.com › artifact › org.apache.commons › commons-lang3
Maven Repository: org.apache.commons » commons-lang3
November 12, 2025 - Apache Commons Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are considered to be so standard as to justify existence in java.lang. The code is tested using the latest revision of the JDK for supported LTS releases: 8, 11, 17, 21 and 25 currently ...
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Educative
educative.io › answers › what-is-stringutilsisblank-in-java
What is StringUtils.isBlank in Java?
You can import the StringUtils class as follows: import org.apache.commons.lang3.StringUtils; public static boolean isBlank(final CharSequence cs) final CharSequence cs: The character sequence/string to check.