The Supplier Interface is a functional interface, which does not take in any argument but produces a value of type T.
It is part of the java.util.function package which has been introduced since Java 8, to implement functional programming in Java.
This functional interface takes in only one generic namely:-
T: denotes the type of the result
The lambda expression assigned to an object of Supplier type is used to define its get() which eventually produces a value.
Suppliers are useful when we don’t need to supply any value and obtain a result from it.
The Supplier interface consists of only one method:
1. get()
This method does not take in any argument but produces a value of type T.
Syntax:
T get();
Returns: This method returns a value of type T.
Below is the code to illustrate get() method:
Program:
import java.util.function.Supplier;
public class Main {
public static void main(String args[])
{
// This function returns a random value.
Supplier<Double> randomValue = () -> Math.random();
// Print the random value using get()
System.out.println(randomValue.get());
}
}
Output:
0.5685808855697841