The Supplier 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 value of type T.
Hence 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 at the same time.
The Supplier interface consists of only one function:
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