Double parseDouble() method in Java with examples

Last Updated : 26 Oct, 2018

The parseDouble() method of Java Double class is a built in method in Java that returns a new double initialized to the value represented by the specified String, as done by the valueOf method of class Double.

Syntax:

public static double parseDouble(String s)

Parameters: It accepts a single mandatory parameter s which specifies the string to be parsed.

Return type: It returns e double value represented by the string argument.

Exception: The function throws two exceptions which are described below:

NullPointerException– when the string parsed is null
NumberFormatException– when the string parsed does not contain a parsable float

Below is the implementation of the above method.

Program 1:

   // Java Code to implement 
// parseDouble() method of Double class 
  
class GFG { 
  
    // Driver method 
    public static void main(String[] args) 
    { 
  
        String str = "100"; 
  
        // returns the double value 
        // represented by the string argument 
        double val = Double.parseDouble(str); 
  
        // prints the double value 
        System.out.println("Value = " + val); 
    } 
} 
 
  

Output:

  Value = 100.0

Program 2: To show NumberFormatException

   // Java Code to implement 
// parseDouble() method of Double class 
  
class GFG { 
  
    // Driver method 
    public static void main(String[] args) 
    { 
  
        try { 
  
            String str = ""; 
  
            // returns the double value 
            // represented by the string argument 
            double val = Double.parseDouble(str); 
  
            // prints the double value 
            System.out.println("Value = " + val); 
        } 
        catch (Exception e) { 
            System.out.println("Exception: " + e); 
        } 
    } 
} 
 
  

Output:

  Exception: java.lang.NumberFormatException: empty String

Program 3: To show NullPointerException

   // Java Code to implement 
// parseDouble() method of Double class 
  
class GFG { 
  
    // Driver method 
    public static void main(String[] args) 
    { 
  
        try { 
  
            String str = null; 
  
            // returns the double value 
            // represented by the string argument 
            double val = Double.parseDouble(str); 
  
            // prints the double value 
            System.out.println("Value = " + val); 
        } 
        catch (Exception e) { 
            System.out.println("Exception: " + e); 
        } 
    } 
} 
 
  

Output:

  Exception: java.lang.NullPointerException

Reference: https://docs.oracle.com/javase/7/docs/api/java/lang/Double.html#parseDouble(java.lang.String)

OptionalDouble of(double) method in Java with examples

gopaldave

Improve

Article Tags :

Practice Tags :

Java

The of(double) method help us to get an OptionalDouble object which contains a double value which is passed as a parameter to this method. Syntax: public static OptionalDouble of(double value) Parameters: This method accepts a double value as parameter that will be set to the returned OptionalDouble

1 min read

OptionalDouble orElse(double) method in Java with examples

The orElse(double) method helps us to get the value in this OptionalDouble object. If a value is not present in this OptionalDouble, then this method returns the value passed as the parameter. Syntax: public double orElse(double other) Parameters: This method accepts double the value to be returned,

1 min read

DoubleAdder sum() method in Java with Examples

The java.DoubleAdder.sum() is an inbuilt method in java that returns the current sum. When the object of the class is created its initial value is zero. Syntax: public double sum() Parameters: This method does not accepts any parameter. Return Value: This method returns the current sum. Below progra

1 min read

DoubleAdder reset() method in Java with Examples

The java.DoubleAdder.reset() is an inbuilt method in java that resets variables maintaining the sum to zero. When the object of the class is created its initial value is zero. Syntax: public void reset() Parameters: This method does not accepts any parameter. Return Value: The method returns the res

1 min read

Number.doubleValue() method in java with examples

The java.lang.Number.doubleValue() is an inbuilt method in java that returns the value of the specified number casted as a double data type. This may involve rounding or truncation. Syntax: public abstract double doubleValue() Parameters: This method does not accepts any parameter. Return value: Thi

1 min read

Short doubleValue() method in Java with Examples

The java.lang.Short.doubleValue() method of Short class is a built in method in Java which is used to return the value of the Short object as a double. Syntax: public double doubleValue() Return type: It return the value of ShortObject as double. Below is the implementation of doubleValue() method i

2 min read

OptionalDouble equals() method in Java with examples

OptionalDouble help us to create an object which may or may not contain a Double value. The equals(Object obj) method help us to compare this OptionalDouble object with the passed object as a parameter and it returns true if objects are equal. The other object is considered equal to this OptionalDou

2 min read

Field setDouble() method in Java with Examples

setDouble() method of java.lang.reflect.Field used to set the value of a field as a double on the specified object. When you need to set the value of a field of an object as double then you can use this method to set value over an Object. Syntax: public void setDouble(Object obj, double d) throws Il

3 min read

DataInputStream readDouble() method in Java with Examples

The readDouble() method of DataInputStream class in Java is used to read eight input bytes and returns a double value. This method reads the next eight bytes from the input stream and interprets it into double type and returns. Syntax: public final double readDouble() throws IOException Specified By

2 min read

PrintStream print(double) method in Java with Examples

The print(double) method of PrintStream Class in Java is used to print the specified double value on the stream. This double value is taken as a parameter. Syntax: public void print(double doubleValue) Parameters: This method accepts a mandatory parameter doubleValue which is the double value to be

2 min read

Double parseDouble() method in Java with examples

Similar Reads