What is CharUtils.isAsciiAlpha in Java?

The isAsciiAlpha method is a static method of the CharUtils class that checks whether the input character is alphabetic.

The method returns true if the character’s ASCII value is in the following list of ranges:

Range	Description
65 to 90	Lowercase alphabets from `a` to `z`
97 to 122	Uppercase alphabets from `A` to `Z`

How to import `CharUtils`

CharUtils is defined in the Apache Commons Lang package. Apache Commons Lang can be added 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 CharUtils class as follows:

import org.apache.commons.lang3.CharUtils;

Syntax

public static boolean isAsciiAlpha(char ch)

Parameters

ch: character we check to determine whether it is an alphabetic character.

Return value

The function returns true if the character is an alphabet with ASCII values between 65-90 or 97-122. Otherwise, it returns false.

Code

import org.apache.commons.lang3.CharUtils;
public class Main {
    public static void main(String[] args) {
        char c1 = 'F';
        System.out.printf("The output of CharUtils.isAsciiAlpha() for the character '%s' is %s", c1, CharUtils.isAsciiAlpha(c1));
        System.out.println();
        c1 = 'È';
        System.out.printf("The output of CharUtils.isAsciiAlpha() for the character '%s' is %s", c1, CharUtils.isAsciiAlpha(c1));
        System.out.println();
        c1 = '9';
        System.out.printf("The output of CharUtils.isAsciiAlpha() for the character '%s' is %s", c1, CharUtils.isAsciiAlpha(c1));
        System.out.println();
        c1 = 't';
        System.out.printf("The output of CharUtils.isAsciiAlpha() for the character '%s' is %s", c1, CharUtils.isAsciiAlpha(c1));
        System.out.println();
    }
}

Expected output

The output of CharUtils.isAsciiAlpha() for the character 'F' is true
The output of CharUtils.isAsciiAlpha() for the character 'È' is false
The output of CharUtils.isAsciiAlpha() for the character '9' is false
The output of CharUtils.isAsciiAlpha() for the character 't' is true