java completable promise example

import java.util.concurrent.CompletableFuture;

import java.util.concurrent.ExecutionException;

import java.util.concurrent.TimeUnit;

import java.util.function.Supplier;

import java.util.concurrent.*;

class Main {

public static void main(String[] args) throws ExecutionException, InterruptedException {

        CompletableFuture<String> whatsYourNameFuture = CompletableFuture.supplyAsync(()-> {

         

           // public String get() {

              System.out.println("in promise");

                try {

                    TimeUnit.SECONDS.sleep(1);

                } catch (InterruptedException e) {

                    throw new IllegalArgumentException(e);

                }

                return "Rajeev";

           // }

        });

        CompletableFuture<String> promiseExample = CompletableFuture.supplyAsync(()-> {

            //public String get() {

              System.out.println("in promise");

                try {

                    TimeUnit.SECONDS.sleep(1);

                } catch (InterruptedException e) {

                    throw new IllegalArgumentException(e);

                }

                return "Kumar";

           // }

        });

      CompletableFuture<String> result = whatsYourNameFuture.thenCombine(promiseExample, (str1, str2) -> {

        String name=str1 + " " + str2;

        return name;

        });

        System.out.println("Value- " + result.get());

        //System.out.println(welcomeText.get());

    }

}