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Java 8 | DoubleSupplier Interface with Examples

Last Updated : 10 Oct, 2018

The DoubleSupplier Interface is a part of the java.util.function package which has been introduced since Java 8, to implement functional programming in Java. It represents a function which does not take in any argument but produces a double value.

The lambda expression assigned to an object of DoubleSupplier type is used to define its getAsDouble() which eventually applies the given operation on its argument. It is similar to using an object of type Supplier<Double>

Functions in DoubleSupplier Interface

The DoubleSupplier interface consists of the only one function:

1. getAsDouble()

This method does not take in any value but produces a double-valued result.

Syntax:

double getAsDouble()

Return Value: This method returns a double value.

Below is the code to illustrate getAsDouble() method:

Program:

// Java Program to illustrate 
// getAsDouble method of 
// DoubleSupplier Interface 
import java.util.function.DoubleSupplier; 
  
public class GFG { 
    public static void main(String args[]) 
    { 
  
        // Create a DoubleSupplier instance 
        DoubleSupplier sup = () -> Math.random(); 
  
        // Get the double value 
        // Using getAsDouble() method 
        System.out.println(sup.getAsDouble()); 
    } 
} 

Output:

0.10283070415816953

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