问题
Is there any advantage in wrapping a BufferedOutputStream around a ByteArrayOutputStream instead of just using the ByteArrrayOutputStream by itself?
回答1:
Generally BufferedOutputStream wrapper is mostly used to avoid frequent disk or network writes. It can be much more expensive to separately write a lot of small pieces than make several rather large operations. The ByteArrayOutputStream operates in memory, so I think the wrapping is pointless.
If you want to know the exact answer, try to create a simple performance-measuring application.
回答2:
Absolutely none. Though BufferedWriter and BufferedReader do offer extra functionality were you to be operating on strings.
回答3:
ByteArrayOutputStream is not recommended if you want to get high performance, but one interesting feature is to send a message with unknown length. For a better comprehension about how these two methods work, see http://java-performance.info/java-io-bytearrayoutputstream/.
来源：https://stackoverflow.com/questions/6821887/bufferedoutputstream-vs-bytearrayoutputstream