如果一个BufferedOutputStream包装另一个BufferedOutputStream呢？

Question

如果一个BufferedOutputStream包装另一个BufferedOutputStream呢？这个问题很简单。但是很困惑。如以下代码所示，

        OutputStream file = new FileOutputStream("test.txt");
        OutputStream buffer = new BufferedOutputStream(file);
        BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(buffer);      //wrap buffer twice
        OutputStream outputStream = new ObjectOutputStream(bufferedOutputStream);  // wrap as ObjectOutputStream
        BufferedOutputStream bufferedOutputStream1 = new BufferedOutputStream(outputStream); //wrap back as BufferedOutputStream
        ObjectOutput output = new ObjectOutputStream(bufferedOutputStream1);

Answer 1

这是怎么回事？有问题吗？

如果你在问是否引入了低效，答案是否定的。代码被优化以处理这种情况，或者更确切地说，是传输大小>=缓冲区大小的情况。