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)
