我应该如何检查Future不为空

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

public class FutureCheckExample {

    public static void main(String[] args) {
        CompletableFuture<String> future = CompletableFuture.completedFuture("Result");

        if (future.isDone()) {
            try {
                String result = future.get();
                if (result != null) {
                    System.out.println("Future result is not null: " + result);
                } else {
                    System.out.println("Future result is null");
                }
            } catch (InterruptedException | ExecutionException e) {
                e.printStackTrace();
            }
        }
    }
}