Asynchrone Programmierung mit Java, allOf und anyOf

Mit der Funktion allOf wird solange auf die Ergebnisse aller Futures gewartet bevor der Code weiterläuft. Mit anyOf hingegen wird nur auf das schnellste Ergebnis gewartet.

import java.util.concurrent.CompletableFuture; 
 
public class Asynchron { 
 
    /<em> in case of multiple futures 
     </em> allOf: Wait until all results from the futures are available 
     <em> anyOf: Wait until one of the results from the futures is available </em>/ 
    public void listOfCompletableFutures(){ 
        CompletableFuture<Integer> futureOne = CompletableFuture.supplyAsync( 
            () -> { 
                return 5; 
            } 
        ); 
 
        CompletableFuture<String> futureTwo = CompletableFuture.supplyAsync( 
            () -> { 
                return "result"; 
            } 
        ); 
 
        CompletableFuture<Integer> futureThree = CompletableFuture.supplyAsync( 
            () -> { 
                return -61; 
            } 
        ); 
 
        /<em> Wait for all futures </em>/ 
        CompletableFuture<Void> futurelist = CompletableFuture.allOf(futureOne, futureTwo, futureThree) 
        .thenAccept( 
            (result) -> { 
                System.out.println(futureOne.join()); 
                System.out.println(futureTwo.join()); 
                System.out.println(futureThree.join()); 
            } 
        ); 
        futurelist.join(); 
 
        /<em> Wait for one of the futures </em>/ 
        CompletableFuture<Object> any = CompletableFuture.anyOf(futureOne, futureTwo, futureThree); 
        Object fastesResult = any.join(); 
        System.out.println(fastesResult); 
 
    } 
     
    public static void main(String[] args){ 
        Asynchron async = new Asynchron(); 
        async.listOfCompletableFutures(); 
    } 
}