ByteArrayOutputStream from OutputStream

How to create OutputS开发者_Python百科tream from ByteArrayOutputStream in Java

Following runs without error:

ByteArrayOutputStream stream = new ByteArrayOutputStream();
OutputStream outStream = stream;

If you see the docs for ByteArrayOutputStream you will find that it extends OutputStream.

ByteArrayOutputStream is a subclass of OutputStream.

ByteArrayOutputStream bos = ...;
OutputStream os = bos;

A ByteArrayOutputStream is an OutputStream. I.e. you can just assign it like this:

ByteArrayOutputStream baos = new ByteArrayOutputStream();
OutputStream out = baos;

You can create a helper method like follows:

public OutputStream convert(ByteArrayOutputStream arrayOutputStreamParam){
        return arrayOutputStreamParam;
    }