How to convert string to double in java program -

public class StringToFloatExample 
{
    public static void main(String args[]) 
    {
        String s = "23.6";
        float f = Float.parseFloat(s);

        System.out.println(f);
    }
}

Explanation for the above code step-by-step

1. Class Declaration:

private class StringToFloatExample {

Declares the class StringToFloatExample. This is the main class that contains the logic for converting a string to a float.

2. Main Method:

public static void main(String args[]) {

The main() method is the entry point for the Java program. This method is where the execution begins.

3. String Declaration:

String s = “23.6”;

A String variable s is declared and initialized with the value “23.6”.
This is a floating-point number represented as a string, but the above cannot be used directly within an arithmetic expression or computation due to its data type. This should be evaluated into a number type, specifically float.

4. Converting String to Float:

float f = Float.parseFloat(“23.6”);

The Float.parseFloat() function evaluates the string “23.6” to a floating-point number type.
In this expression f = f(); The given expression is evaluated parsing the string \ “23.6 “, whose result will go into a floating point number to the float called f.
The variable value of f in this instance, is 23.6f. By which f suffices for denoting a floating literal.

5.Print floating Value :

System.out.println(f);

The println() method prints the value of the variable f to the console. Since f is now a float type, it will print the numeric value 23.6.

Output of the Program:

When the program is run, the following output will be printed to the console:

23.6

Explanation of the Output:

The method of Float.parseFloat(“23.6”) converts the string “23.6” into a float value, which is 23.6. The value is printed.

Key Points:

Float.parseFloat(s): This function takes a string that can represent a float and returns the string as a float. It should be able to represent a valid floating point number, for example, “23.6”, “0.5”, “-12.34”, etc.
If the string has characters that are not parsable as a number (like “”abc””), then it will throw a NumberFormatException.

Example:

String s = “23.6”; // String representing a floating-point value

float f = Float.parseInt(s); // Convert the string to float

System.out.println(f); // Print the float value: 23.6