如何在Java中异步调用方法

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

public class AsyncExample {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        CompletableFuture<String> future = CompletableFuture.supplyAsync(() -> {
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            return "Hello, World!";
        });

        System.out.println("Doing something else...");

        System.out.println(future.get());
    }
}