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What is NumberUtils.isCreatable in Java?

abhilash

Grokking Modern System Design Interview for Engineers & Managers

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isCreatable() is a staticthe methods in Java that can be called without creating an object of the class. method of the NumberUtils class that is used to check whether a given string is a valid Java number or not. A null, empty, or blank String will return false.

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>

You can import the NumberUtils class as follows:


import org.apache.commons.lang3.math.NumberUtils;

Syntax


public static boolean isCreatable(final String str)

Parameters

  • final String str: The string to check.

Return value

This method returns true if the string is a valid number in Java. Otherwise, it returns false.

Code

import org.apache.commons.lang3.math.NumberUtils;
public class Main{
public static void main(String[] args){
// Example 1
String valueToConvert = "234.323232232";
System.out.printf("NumberUtils.isCreatable(%s) = %s", valueToConvert, NumberUtils.isCreatable(valueToConvert));
System.out.println();
// Example 2
valueToConvert = "0xABED";
System.out.printf("NumberUtils.isCreatable(%s) = %s", valueToConvert, NumberUtils.isCreatable(valueToConvert));
System.out.println();
// Example 3
valueToConvert = "q3ewsf";
System.out.printf("NumberUtils.isCreatable(%s) = %s", valueToConvert, NumberUtils.isCreatable(valueToConvert));
System.out.println();
}
}

Example 1

  • string = 234.323232232

The method returns true because the string is a valid decimal value.

Example 2

  • string = 0xABED

The method returns true because the string is a valid hexadecimal value.

Example 3

  • string = q3ewsf

The method returns false because the string is cannot be converted to a valid number in java.

Output

The output of the code will be as follows:


NumberUtils.isCreatable(234.323232232) = true
NumberUtils.isCreatable(0xABED) = true
NumberUtils.isCreatable(q3ewsf) = false

RELATED TAGS

java
communitycreator

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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