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Supplier Interface in Java with Examples

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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.


T get()

Returns: This method returns a value of type T.

Below is the code to illustrate get() method:


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()


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Last Updated : 08 Oct, 2018
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