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Java Define a Functional Interface in java

SAMER SAEID answered on May 5, 2021 Popularity 8/10 Helpfulness 2/10

answer Java Define a Functional Interface in java

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Java Define a Functional Interface in java

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import java.lang.FunctionalInterface;
@FunctionalInterface
public interface MyInterface{
    // the single abstract method
    double getValue();
}

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Contributed on May 25 2022

SAMER SAEID

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A functional interface is an interface that contains only one abstract method. They can have only one functionality to exhibit.

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Contributed on May 05 2021

oubaydos

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functional interface java

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import java.util.function.Function;

public class FunctionalProgrammingExample {

    public static void main(String[] args) {
        // Functional interfaces are interfaces designed for a single function and provide ways for specific functional behaviors
        //  Example 1 : Consumer functional interface  (a void function, to be fair)

        Consumer<String> myConsumer = (message) -> {System.out.println("Consumer: " + message)}; //Takes input as String, produces no output
        myConsumer.accept("Hello, Consumer!"); // Calling the consumer


        // Example 2 : Runable concurrent functional interface  
        Runnable myRunnable = () -> {
            for (int i = 0; i < 5; i++) {
                System.out.println("Runnable: " + i);
                }
            };
        Thread myThread = new Thread(myRunnable);
        myThread.start(); // calling the runnable

        // Example 3 : Chaining functional interfaces
        
        Function<Integer, Integer> first = x -> x + 2; // Takes input as Integers, generates output as Integers
        Function<Integer, Integer> second = x -> x * 3; // Takes input as Integers, generates output as Integers
        
        // valid as long as the first functions output can be accepted as the second function's input
      	// Also valid for method reference in .andThen
        Function<Integer, Integer> firstThenSecond = first.andThen(second); // Using andThen to compose a pipeline of functions 
        int result = firstThenSecond.apply(5); // Calling the composed function
      	first.andThen(System.out::println);// Calling with method reference
    }
}

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Contributed on Jan 01 2024

Innocent Iguana

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Java Define a Functional Interface in java

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