Use System.setOut() (and System.setErr() ) to redirect the output to an arbitrary printstream - which can be one that you read from programmatically.
Use System.setOut() (and System.setErr()) to redirect the output to an arbitrary printstream - which can be one that you read from programmatically. For example: final ByteArrayOutputStream myOut = new ByteArrayOutputStream(); System. SetOut(new PrintStream(myOut)); // test stuff here... final String standardOutput = myOut.toString().
So simply going PrintStream _out = System. Out; Won't work? – Frank V Jan 30 '10 at 20:37 It would - i.e.
You'd have a reference to the existing output stream - but you can't read anything from it as there are no appropriate methods to do so on the general PrintStream interface. The technique involves setting the output to a specific printstream you know how to read from. – Andrzej Doyle Jan 30 '10 at 20:38.
The System class has methods setIn(), setOut() and setErr() that allow you to set the standard input, output and error streams, e.g. To a ByteArrayOutputStream that you can inspect at will.
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