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);      }  }  

Test it Now

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”);          }      }  }  

Test it Now

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);    }  }  

Test it Now

Output:

Enter any string:[email protected]  Exception in thread "main" java.lang.NumberFormatException: For input string: "[email protected]"  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”);      }    }  }  

Test it Now

Output:

Enter any string:[email protected]  An exception java.lang.NumberFormatException: For input string: "[email protected]" has occured.  Plz enter a valid double integer

Next TopicJava Double

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Java Double parseDouble() Method with Examples

Java Double parseDouble() Method

Syntax

Parameters

Return value

Throws

Example 1

Example 2

Example 3

Example 4

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