An example to show runAsync method of completablefuture.

SupplyAsyncExample.java

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;

class Test {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        CompletableFuture completableFuture = CompletableFuture.supplyAsync(() -> {
            System.out.println(Thread.currentThread().getName() + " Runnable Call to be executed by another thread");
            return "Result of the asynchronous computation";
        });
        System.out.println(Thread.currentThread().getName() + " Main Thread");
        System.out.println(completableFuture.get());
    }
}