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 equivalent to > /dev/null?
Is there a Null OutputStream in Java?
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9 Answers
/**Writes to nowhere*/
public class NullOutputStream extends OutputStream {
@Override
public void write(int b) throws IOException {
}
}
Java doesn't it would seem but Apache Commons IO does. Take a look at the following:
Hope that helps.
Since Java 11, there is a static utility that does exactly what you need, a static factory method OutputStream.nullOutputStream():
Returns a new OutputStream which discards all bytes. The returned stream is initially open. The stream is closed by calling the close() method. Subsequent calls to close() have no effect.
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.
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 :)
There is new boy in the town, that takes care of this like a charm, just few lines of code should work. Its JDK 11 and nullWriter() has been introduced there, that takes care of this. Here goes the code to deal with same old problem, new way without worrying about Operating System(OS).
String fileContent = "Welcome to StackOverflow readers !! Here goes the question link...";
Writer writer = Writer.nullWriter();
writer.write(fileContent);
writer.close();
Hope this may help someone!
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