Convert String to Double in Java

In Java, a String containing a valid numeric value can be converted into a double or Double using the methods provided by the Double class. The commonly used approaches are parseDouble() and valueOf(). The parseDouble() method returns a primitive double, whereas valueOf() returns a Double object.

• Double.valueOf() converts a String into a Double object.
• Both methods accept strings containing valid floating-point values.

Methods for String-to-Double Conversion

1. Using parseDouble() Method

The Double.parseDouble() method converts a string representing a valid floating-point number into a primitive double.

Syntax

double d = Double.parseDouble(str);

Example: Program to Convert String to Double Using parseDouble() Method.

class Geeks {
    public static void main(String[] args) {

        String str = "2033.12244";

        double value = Double.parseDouble(str);

        System.out.println(value);
    }
}

2033.12244

Explanation: The string "2033.12244" is passed to Double.parseDouble(), which converts it into the primitive double value 2033.12244.

2. Using valueOf() Method of Double Class

The Double.valueOf() method converts a string into a Double object representing the specified numeric value.

Syntax

double d = Double.valueOf(str);

Example: Program to Convert String to Double Using valueOf() Method.

public class Geeks
{
    // Main driver method
    public static void main(String args[])
    {
        // Creating and initializing a string
        String str = "2033.12244";

        // Converting the above string to Double type
        double d = Double.valueOf(str);

        // Printing above string as double type
        System.out.println(d);
    }
}

2033.12244

Explanation: The Double.valueOf() method parses the string and returns a Double object containing the corresponding numeric value.