Java Double parseDouble() Method

The parseDouble method of Java Double class returns a new double value that is initialized to the value corresponding to defined String.

This method executes same as valueOf() method of Float class.

Syntax

Parameters

s- This is the string to be parsed.

Return value

The parseDouble() method returns the double value corresponding to the parameter passed.

Throws

The parseDouble() method throws:

1.NullPointerException- if the string passed is null.

2.NumberFormatException- if the string passed does not hold a parsable float.

Example 1

public class Double_parseDoubleMethodExample1 {
    public static void main(String[] args) {
        String val1="1000";
        String val2="156";
        //here instead of adding it will concatenate two Strings
        //but will convert the String into Float
        Double d = Double.parseDouble(val1+val2);
        System.out.println("1. Sum ="+d);
        Double f1 = Double.parseDouble(val1)+Double.parseDouble(val2);
        System.out.println("2. Sum ="+f1);
        Double f2 = Double.parseDouble(val1)*Double.parseDouble(val2);
        System.out.println("3. Multiplication ="+f2);
        Double f3 = Double.parseDouble(val1)/Double.parseDouble(val2);
        System.out.println("4. Division ="+f3);
        Double f4 = Double.parseDouble(val1)%Double.parseDouble(val2);
        System.out.println("5. Reminder ="+f4);
    }
}

Output:

1. Sum =1000156.0
2. Sum =1156.0
3. Multiplication =156000.0
4. Division =6.410256410256411
5. Reminder =64.0

Example 2

import java.util.Scanner;

public class Double_parseDoubleMethodExample2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter your age:");
        String str = scanner.next();
        //
        Double d1 = Double.parseDouble(str);
        Double d2 = 2018 - d1 ;
        System.out.println("Your year of birth is = "+d2);
        if(d2<1965){
            System.out.println("You are an adult, you are eligible for the discount in railway tickets.");
        }
        else{
            Double d3=d2-1965;
            System.err.println("Sorry! You are not eligible.Try again after "+d3+" years");
        }
    }
}

Output:

Enter your age:09
Sorry! You are not eligible.Try again after 44.0 years
Your year of birth is = 2009.0

Example 3

import java.util.Scanner;

public class Double_parseDoubleMethodExample3 {
    public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
        System.out.print("Enter any string:");
        String str = scanner.next();
        Double d1= Double.parseDouble(str);
        System.out.println("Double value = "+ d1);

}
}

Output:

Enter any string:Himanshu@123
Exception in thread "main" java.lang.NumberFormatException: For input string: "Himanshu@123"
	at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:2043)
	at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110)
	at java.lang.Double.parseDouble(Double.java:538)

Example 4

import java.util.Scanner;

public class Double_parseDoubleMethodExample4 {
    public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    try {
        System.out.print("Enter any string:");
        String str = scanner.next();
        Double d1 = Double.parseDouble(str);
        String str1="null";
        Double d2 = Double.parseDouble(str1);
        System.out.println("1. Double value = " + d1);
        System.out.println("2. Double value = " + d2);
    }catch (NullPointerException e){
        System.out.println("An exception "+e+" has occured.\nPlz enter a valid double integer");
    }catch (NumberFormatException ex){
        System.out.println("An exception "+ex+" has occured.\nPlz enter a valid double integer");
    }
  }
}

Output:

Enter any string:himanshu@123
An exception java.lang.NumberFormatException: For input string: "himanshu@123" has occured.
Plz enter a valid double integer

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