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copied!<p>You can use PipedInputStream and PipedOutputStream.</p> <pre><code>//create pairs of Piped input and output streasm for std out and std err final PipedInputStream outPipedInputStream = new PipedInputStream(); final PrintStream outPrintStream = new PrintStream(new PipedOutputStream( outPipedInputStream)); final BufferedReader outReader = new BufferedReader( new InputStreamReader(outPipedInputStream)); final PipedInputStream errPipedInputStream = new PipedInputStream(); final PrintStream errPrintStream = new PrintStream(new PipedOutputStream( errPipedInputStream)); final BufferedReader errReader = new BufferedReader( new InputStreamReader(errPipedInputStream)); final PrintStream originalOutStream = System.out; final PrintStream originalErrStream = System.err; final Thread writingThread = new Thread(new Runnable() { @Override public void run() { try { System.setOut(outPrintStream); System.setErr(errPrintStream); // You could also set the System.in here using a // PipedInputStream DoSomething(); // Even better would be to refactor DoSomething to accept // PrintStream objects as parameters to replace all uses of // System.out and System.err. DoSomething could also have // an overload with DoSomething() calling: DoSomething(outPrintStream, errPrintStream); } finally { // may also want to add a catch for exceptions but it is // essential to restore the original System output and error // streams since it can be very confusing to not be able to // find System.out output on your console System.setOut(originalOutStream); System.setErr(originalErrStream); //You must close the streams which will auto flush them outPrintStream.close(); errPrintStream.close(); } } // end run() }); // end writing thread //Start the code that will write into streams writingThread.start(); String line; final List<String> completeOutputStreamContent = new ArrayList<String>(); while ((line = outReader.readLine()) != null) { completeOutputStreamContent.add(line); } // end reading output stream final List<String> completeErrorStreamContent = new ArrayList<String>(); while ((line = errReader.readLine()) != null) { completeErrorStreamContent.add(line); } // end reading output stream </code></pre>

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