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toFloat()
is a static method of the NumberUtils
class that is used to convert the given string to a float
value.
One variant of the method accepts a default value which is returned if the conversion fails.
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;
public static float toFloat(String str, float defaultValue)
String str
: This is the string to convert.float defaultValue
: This is the default value to return.This method returns a float
value. If the conversion fails, it returns the default value.
public static float toFloat(final String str)
This variant of the function returns
0.0f
if conversion fails.
import org.apache.commons.lang3.math.NumberUtils;
public class Main{
public static void main(String[] args){
// Example 1
String stringToConvert = "23.356";
float defaultValue = 24.34f;
System.out.printf("The output of the method NumberUtils.toFloat(%s, %s) is %s", stringToConvert, defaultValue, NumberUtils.toFloat(stringToConvert, defaultValue));
System.out.println();
// Example 2
stringToConvert = "233sdf";
defaultValue = 24.34f;
System.out.printf("The output of the method NumberUtils.toFloat(%s, %s) is %s", stringToConvert, defaultValue, NumberUtils.toFloat(stringToConvert, defaultValue));
System.out.println();
}
}
string to convert = 23.356
default value = 24.34f
The method returns 23.356
because the conversion is successful.
string to convert = 233sdf
default value = 24.34f
The method returns 24.34
because the conversion is unsuccessful.
The output of the code is as follows:
The output of the method NumberUtils.toFloat(23.356, 24.34) is 23.356
The output of the method NumberUtils.toFloat(233sdf, 24.34) is 24.34
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