How to convert a Java String to a float

By Alvin Alexander. Last updated: January 25, 2018

Java String/float FAQ: How do I convert a Java String to a float?

Converting a String to a float requires that you first convert the String to a Float object, then convert the Float object to a float data type (Float is an object, while float is a primitive data type).

An example of a simple program that performs this conversion is shown below:

public class StringToFloat
{

  public static void main (String[] args)
  {

    // String s = "fred";    // do this if you want an exception

    String s = "100.00";

    try
    {
        float f = Float.valueOf(s.trim()).floatValue();
        System.out.println("float f = " + f);
    }
    catch (NumberFormatException nfe)
    {
        System.out.println("NumberFormatException: " + nfe.getMessage());
    }
  }
}