LoomApp.java

import java.util.concurrent.Executors;
import java.util.concurrent.Callable;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.time.Instant;
import java.util.concurrent.TimeUnit;
public class LoomApp{

    public static void main (String [] args) throws Exception{
        var thread = Thread.startVirtualThread(() -> System.out.println("virtualthread Hello"));
        thread.join();

        var thread1 = Thread.builder().virtual().task(() -> System.out.println("virtual task hello")).build();
        var thread2 = Thread.builder()
            .virtual()
            .name("bob")
            .task(() -> System.out.println("virtual name task I'm Bob!"))
            .start();

        var factory = Thread.builder().virtual().name("worker", 0).factory();

        try(var executor = Executors.newVirtualThreadExecutor()){
            executor.execute(() -> System.out.println("Hello"));
            executor.execute(() -> System.out.println("Hi"));
        }

        try(var executor = Executors.newVirtualThreadExecutor()){
            Callable<String> task1 = () -> "invokeAny foo";
            Callable<String> task2 = () -> "invokeAny bar";
            Callable<String> task3 = () -> "invokeAny baz";

            var result = executor.invokeAny(List.of(task1, task2, task3));
        }

        try(var executor = Executors.newVirtualThreadExecutor()){
            Callable<String> task1 = () -> "completable future foo";
            Callable<String> task2 = () -> "completable future bar";
            Callable<String> task3 = () -> "completable future baz";

            var cfs = executor.submitTasks(List.of(task1, task2, task3));

            CompletableFuture.completed(cfs)
                .map(CompletableFuture::join)
                .forEach(System.out::println);
        }

        var seconds = 3;
        var deadline = Instant.now().plusSeconds(seconds) ;

        try(var executor = Executors.newVirtualThreadExecutor().withDeadline(deadline)){
            Callable<String> task1 = () -> "deadline foo";
            Callable<String> task2 = () -> "deadline bar";
            Callable<String> task3 = () -> "deadline baz";
            Callable<String> task4 = () -> {
                var sleepSeconds = seconds - 1;
                TimeUnit.SECONDS.sleep(sleepSeconds);
                return "deadline task4 by sleep " + sleepSeconds + " seconds";
            };

            var cfs = executor.submitTasks(List.of(task1, task2, task3, task4));

            CompletableFuture.completed(cfs)
                .map(CompletableFuture::join)
                .forEach(System.out::println);

        }

    }
}

Ref:
https://cmonkey.github.io/2020/07/17/loom/
https://wiki.openjdk.java.net/display/loom/Getting+started