What is CharUtils.isAscii in Java?

The isAscii method is a static method of the CharUtils class that checks whether the input character is a 7-bit ASCII character. The method checks if the character’s decimal value ranges from 0 to 128.

How to import `CharUtils`

CharUtils is defined in the Apache Commons Lang package. The 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 isAscii( char ch)

Parameters

ch: the character to be checked whether it is an ASCII character

Return value

The function returns true if the character is an ASCII character. 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.isAscii() for the character '%s' is %s", c1, CharUtils.isAscii(c1));
        System.out.println();
        c1 = 'p';
        System.out.printf("The output of CharUtils.isAscii() for the character '%s' is %s", c1, CharUtils.isAscii(c1));
        System.out.println();
        c1 = '9';
        System.out.printf("The output of CharUtils.isAscii() for the character '%s' is %s", c1, CharUtils.isAscii(c1));
        System.out.println();
        c1 = '@';
        System.out.printf("The output of CharUtils.isAscii() for the character '%s' is %s", c1, CharUtils.isAscii(c1));
        System.out.println();
        c1 = 'È';
        System.out.printf("The output of CharUtils.isAscii() for the character '%s' is %s", c1, CharUtils.isAscii(c1));
        System.out.println();
    }
}

Expected output

The output of CharUtils.isAscii() for the character 'F' is true
The output of CharUtils.isAscii() for the character 'p' is true
The output of CharUtils.isAscii() for the character '9' is true
The output of CharUtils.isAscii() for the character '@' is true
The output of CharUtils.isAscii() for the character 'È' is false

Explanation

c1 = 'F'

The method returns true since the character is an ASCII character and the character’s numerical value is in the 0 to 128 range.
c1 = 'p'

The method returns true since the character is an ASCII character and the character’s numerical value is in the 0 to 128 range.
c1 = '9'