What is StringUtils.isAlphanumericSpace in Java?

Overview

isAlphanumericSpace() is a static method of the StringUtils class that is used to check if a given string contains only Unicode letters, digits, or spaces (" ").

  • The method returns false if the string contains Unicode symbols except for Unicode letters, digits, or spaces (" ").

  • The method returns false if the input string is null.

  • The method returns false if the input string is empty.

How to import StringUtils

StringUtils 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.

You can import the StringUtils class as follows.

import org.apache.commons.lang3.StringUtils;

Syntax

public static boolean isAlphanumericSpace(final CharSequence cs)

Parameters

  • final CharSequence cs: the character sequence/string to be checked.

Return value

This method returns true if the string is not null and contains only Unicode digits, letters, or spaces (" "). Otherwise, it returns false.

Code

import org.apache.commons.lang3.StringUtils;
public class Main {
    public static void main(String[] args) {
        String s = "543234 asfg";
        System.out.printf("The output of StringUtils.isAlphanumericSpace() for the string - '%s' is %s", s, StringUtils.isAlphanumericSpace(s));
        System.out.println();
        s = "";
        System.out.printf("The output of StringUtils.isAlphanumericSpace() for the string - '%s' is %s", s, StringUtils.isAlphanumericSpace(s));
        System.out.println();
        s = null;
        System.out.printf("The output of StringUtils.isAlphanumericSpace() for the string - '%s' is %s", s, StringUtils.isAlphanumericSpace(s));
        System.out.println();
        s = "   ";
        System.out.printf("The output of StringUtils.isAlphanumericSpace() for the string - '%s' is %s", s, StringUtils.isAlphanumericSpace(s));
        System.out.println();
        s = "hello-educative";
        System.out.printf("The output of StringUtils.isAlphanumericSpace() for the string - '%s' is %s", s, StringUtils.isAlphanumericSpace(s));
        System.out.println();
    }
}

Output

The output of StringUtils.isAlphanumericSpace() for the string - '543234 asfg' is true
The output of StringUtils.isAlphanumericSpace() for the string - '' is false
The output of StringUtils.isAlphanumericSpace() for the string - 'null' is false
The output of StringUtils.isAlphanumericSpace() for the string - '   ' is true
The output of StringUtils.isAlphanumericSpace() for the string - 'hello-educative' is false

Explanation

Example 1

  • string - "543234 asfg"

The method returns true, as the string contains only Unicode digits, letters, and a space.

Example 2

  • string - ""

The method returns false, as the string is empty.

Example 3

  • string - null

The method returns false, as the string points to null reference.

Example 4

  • string - " "

The method returns true, as the string contains only spaces that are allowed.

Example 5

  • string - "hello-educative"

The method returns false, as the string contains other Unicode symbols like -.

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