Convert String to Float in Java

Last Updated : 22 Nov, 2024

To convert a String to a Float in Java, there are several ways including built-in methods and handling potential exceptions for invalid inputs.

Example:

For this conversion, we will use the most common and efficient method i.e. parseFloat() method. This method converts a string into a primitive float.

Java

// Java program to convert String to float
import java.util.*; 

public class StringToFloat {
    public static void main(String[] args) {
      
        String s = "1.6";

        // Convert string to float
        float n = Float.parseFloat(s);

        System.out.println("" + n);
    }
}

Output

1.6

Different Approaches to Convert String to Float in Java

1. Using `Float.valueOf()`

Another approach to convert a string to float in Java is the Float.valueOf() method of the Float class. This method converts a string into a Float object, which can then be used as a primitive float.

Syntax of `Float.valueOf()` Method

Float.valueOf(str);

Example:

Java

// Java Program to convert string to float
import java.util.*;

class GFG {

    // Function to convert String to Float
    public static float StringToFloat(String s) {

        // Convert string to float
        // using valueOf() method
        return Float.valueOf(s);
    }

    // Driver code
    public static void main(String[] args) {

        String s1 = "1.0";

        // The expected float value
        float f;

        // Convert string to float
        f = StringToFloat(s1);

        // Print the expected float value
        System.out.println(s1+ " after converting into float: " + f);
    }
}

Output

1.0 after converting into float: 1.0

2. Handling Invalid Input

If the input string cannot be parsed as a float, a NumberFormatException is thrown. The below example shows how to handle this types of errors.

Example:

Java

// Java program to handle invalid input 
// during String to Float conversion
import java.util.*;

public class StringToFloat {
    public static void main(String[] args) {
      
        String s = "invalid";

        try {
          
            float n = Float.parseFloat(s);
            System.out.println("Converted float value: " + n);
          
        } catch (NumberFormatException e) {
            System.out.println("Error: Invalid input for float conversion");
        }
    }
}

Output

Error: Invalid input for float conversion

Java Program to Convert a Float value to String

code_r

Improve

Article Tags :

Practice Tags :

Java

Convert String to Float in Java

Different Approaches to Convert String to Float in Java

1. Using Float.valueOf()

Syntax of Float.valueOf() Method

2. Handling Invalid Input

Similar Reads

Thank You!

What kind of Experience do you want to share?

1. Using `Float.valueOf()`

Syntax of `Float.valueOf()` Method