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What is StringUtils.indexOfDifference in Java?

abhilash

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Overview

In Java, indexOfDifference() is a staticthe methods in Java that can be called without creating an object of the class. method of the StringUtils figures out the index of the first character sequence that differs from the given sequence. The comparison of the character sequences in the given text is case-sensitive.

How to import StringUtils

The definition of StringUtils can be found in the Apache Commons Lang package. We can add this 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-lang package, refer to the Maven Repository.

We can import the StringUtils class as follows:


import org.apache.commons.lang3.StringUtils;

Syntax


public static int indexOfDifference(final CharSequence cs1, final CharSequence cs2)

Parameters

  • cs1: This is the first character sequence/text to compare.
  • cs2: This is the second character sequence/text to compare.

Return value

This method returns an integer.

Overloaded methods

  • public static int indexOfDifference(final CharSequence... css)

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 StringUtils class.
  • Lines 5-8: We define the indexOfDifferenceMethod method. This method finds the index where the texts start differing by invoking the StringUtils.indexOfDifference method.
  • Lines 11-21: We invoke the indexOfDifferenceMethod method for different values of the character sequences.

RELATED TAGS

java
communitycreator
indexofdifference
stringutils

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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