This program explains the syntax of using lambda expressions in Java

Lambdas_01.java

package com.ucguy4u.functional.java;

import java.util.Arrays;
import java.util.function.BiFunction;
import java.util.function.Consumer;

/**
 *
 * @author chauhanuday
 */
public class Lambdas_01 {

	/**
	 * @param args the command line arguments
	 */
	public static void main(String[] args) {

		// Anonymous Inner Class: Runnable
		Runnable r1 = new Runnable() {
			@Override
			public void run() {
				System.out.println("Thread 1 is running");
			}
		};

		// Lambda version of Runnable (no arguments)
		Runnable r2 = () -> System.out.println("\nThread 2 is running");

		// Start both threads
		r1.run();
		r2.run();

		// using an existing functional interface BiFunction
		BiFunction<String, String, String> concat = (a, b) -> a + b;
		String sentence = concat.apply("Today is ", "a great day");
		System.out.println("\n" + sentence + "\n");

		// example of the Consumer functional interface
		Consumer<String> hello = name -> System.out.println("Hello, " + name);
		for (String name : Arrays.asList("Duke", "Mickey", "Minnie")) {
			hello.accept(name);
		}

		// example of passing one value
		GreetingFunction greeting = message -> System.out.println("\nJava Programming " + message);
		greeting.sayMessage("Rocks with lambda expressions");
	}

	// custom functional interface
	@FunctionalInterface
	interface GreetingFunction {
		void sayMessage(String message);
	}
}