Is there a Null OutputStream in Java?

Question

I need to specify an OutputStream for an API I\'m using, but I don\'t actually have a need for the output. Does Java have an OutputStream equivale

Answer 1

Rehashing the answers already provided -

Java does not have a NullOutputStream class. You could however roll your own OutputStream that ignores any data written to it - in other words write(int b), write(byte[] b) and write(byte[] b, int off, int len) will have empty method bodies. This is what the Common IO NullOutputStream class does.

Answer 2

It's not mentioned yet, so I'll also add Guava's ByteStreams.nullOutputStream(), as some might prefer Guava over Apache Commons IO or already have it in their project.

Note: If you use an older version of Guava (from 1.0 to 13.0), you want to use com.google.io.NullOutputStream.

Answer 3

Java doesn't it would seem but Apache Commons IO does. Take a look at the following:

https://commons.apache.org/proper/commons-io/javadocs/api-2.5/org/apache/commons/io/output/NullOutputStream.html

Hope that helps.

Answer 4

Java 11 added OutputStream.nullOutputStream()

Answer 5

Not in the standard library AFAIK, but it shouldn't be difficult to create one by overriding write in OutputStream

Answer 6

No, but it is pretty easy to implement.

See this question "How to remove System.out.println from codebase"

And then you just have to:

System.setOut( DevNull.out );

Or something like that :)

System.setOut(PrintStream)