What is NumberUtils.isDigits() in Java?
Overview
isDigits() is a NumberUtils that is used to check if the input string contains only digits. The method returns false if the input is null or an empty string.
How to import NumberUtils
The definition of NumberUtils 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.
You can import the NumberUtils class as follows:
import org.apache.commons.lang3.math.NumberUtils;
Syntax
public static boolean isDigits(final String str)
Parameters
final String str: This is the string to check.
Return value
This method returns true if the string contains only digits. Otherwise, it returns false.
Code
import org.apache.commons.lang3.math.NumberUtils;public class Main{public static void main(String[] args){// Example 1String stringToConvert = "23356";System.out.printf("The output of the method NumberUtils.isDigits(%s) is %s", stringToConvert, NumberUtils.isDigits(stringToConvert));System.out.println();// Example 2stringToConvert = "233sdf";System.out.printf("The output of the method NumberUtils.isDigits(%s) is %s", stringToConvert, NumberUtils.isDigits(stringToConvert));System.out.println();}}
Example 1
string to convert = 23356
The method returns true, as the input string contains only digits.
Example 2
string to convert = 233sdf
The method returns false, as the input string contains digits and alphabets.
Output
The output of the code will be as follows:
The output of the method NumberUtils.isDigits(23356) is true
The output of the method NumberUtils.isDigits(233sdf) is false
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