What is NumberUtils.toDouble() in Java?

Overview

toDouble() is a staticThis describes the methods in Java that can be called without creating an object of the class. method of the NumberUtils class that is used to convert the given string to a double value.

One variant of the method accepts a default value which is returned if the conversion fails.

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-lang package, refer to the Maven Repository.

You can import the NumberUtils class as follows:

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

Syntax

public static double toDouble(final String str, final double defaultValue)

Parameters

• final String str: This is the string to convert.
• final double defaultValue: This is the default value to return.

Return value

This method returns a double value. If the conversion fails, it returns the default value.

Overloaded methods

• public static double toDouble(final String str)

Code

Example 1

• string to convert = 23.34
• default value = 24

The method returns 23.34 because the conversion is successful.

Example 2

• string to convert = 233sdf
• default value = 24

The method returns 24.0 because the conversion is unsuccessful.

Output

The output of the code is as follows:

The output of the method NumberUtils.toDouble(23.34, 24.0) is 23.34
The output of the method NumberUtils.toDouble(233sdf, 24.0) is 24.0