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Thread factory = Thread.builder().virtual().factory()

try (ExecutorService executor = Executors.newUnboundedExecutor(factory)) {

    executor.schedule(task1);

    executor.schedule(task2);

}

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This structure lends itself to nesting or even a tree of tasks:

try (ExecutorService executor = Executors.newUnboundedExecutor(factory)) {
    executor.submit(() -> foo());
    executor.submit(() -> bar());
}

void foo()  {

    try (ExecutorService executor = Executors.newUnboundedExecutor(factory)) {

        executor.submit(...);
    }

}

void bar() {

    try (ExecutorService executor = Executors.newUnboundedExecutor(factory)) {

        executor.submit(...);

   

 }

}

In this example, the main task will not complete until foo and bar complete. The foo method, executing in a virtual thread, does not complete until the task that is submitted completes. Similarly bar, executing in another virtual thread, does not complete until the task that it submitted completes.

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