扩展FutureTask,如何处理取消

public class MyFutureTask<V> extends FutureTask<V> {
    public MyFutureTask(Callable<V> callable) {
        super(callable);
    }

    public MyFutureTask(Runnable runnable, V result) {
        super(runnable, result);
    }

    @Override
    public boolean cancel(boolean mayInterruptIfRunning) {
        // 在这里添加自定义的取消操作
        return super.cancel(mayInterruptIfRunning);
    }
}

@Override
public boolean cancel(boolean mayInterruptIfRunning) {
    // 在这里添加自定义的取消操作
    boolean result = super.cancel(mayInterruptIfRunning);
    if (result) {
        // 执行自定义的清理操作
    }
    return result;
}

MyFutureTask<String> futureTask = new MyFutureTask<>(new Callable<String>() {
    @Override
    public String call() throws Exception {
        // 在这里执行异步任务
        return "Hello, World!";
    }
});

boolean cancelled = futureTask.cancel(true);