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)
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