CompletableFuture and ExecutorService

CompletableFuture and ExecutorService 

ExecutorService

public static void main(String[] args) throws ExecutionException, InterruptedException {
        ExecutorService executor = Executors.newFixedThreadPool(3);
        Future futureResult = executor.submit(new Add(10, 20)); // 1
        Integer intermediateResult = futureResult.get(); // 2
        Future finalResult = executor.submit(new Multiply(intermediateResult)); // 3
        System.out.println(finalResult.get());
        executor.shutdown();
    }

CompletableFuture

 

public static void main(String[] args) throws ExecutionException, InterruptedException {
    Integer finalResult = CompletableFuture.supplyAsync(() -> add(10, 20))
            .thenApplyAsync(result -> multiply(result))
            .get();
    System.out.println(finalResult);
}
public static Integer add(int a, int b) {
    return a + b;

}
public static Integer multiply(int result) {
    return result * 15;
}

Source: medium.com/@anil.java.story