What is StringUtils.substringAfter in Java?
Overview
The substringAfter() method is a StringUtils. It is used to return the substring that comes after the first occurrence of the given separator. The separator is not returned along with the substring.
If the separator is null or is not found in the input string, an empty string is returned.
How to import StringUtils
The definition of StringUtils can be found in the Apache Commons Lang package, which we can add to the Maven project by adding the following dependency to the pom.xml file:
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.12.0</version>
</dependency>
For other versions of the
commons-langpackage, refer to the Maven Repository.
We can import the StringUtils class as follows:
import org.apache.commons.lang3.StringUtils;
Syntax
public static String substringAfter(final String str, final String separator)
Parameters
str: This is the string from which a substring is to be retrieved.separator: This is the string to search instr.
Return value
This method returns the substring that comes after the first occurrence of the separator.
Code
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>test</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.12.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.1</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>Main</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>Explanation
The Maven dependency for StringUtils is included in the pom.xml file Main.java.
- Line 1: We import the
StringUtilsclass. - Line 6: We define a string called
text. - Line 7: We define the separator called
sep. - Line 8: The substring after the first occurrence of
sepis retrieved by invoking thesubstringAfter()method. - Line 10:
nullis assigned tosep. - Line 11: The substring after the first occurrence of
sepis retrieved by invoking thesubstringAfter()method. Assepisnull, an empty string is returned. - Line 13: A new value that is not present in
textis assigned tosep. - Line 14: The substring after the first occurrence of
sepis retrieved by invoking thesubstringAfter()method. Assepis not intext, an empty string is returned.
