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NNTP-Posting-Date: Mon, 30 Jan 2012 16:37:04 -0600
Date: Mon, 30 Jan 2012 14:37:03 -0800
From: Patricia Shanahan <pats@acm.org>
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Subject: Re: how to read back the lines printed out to the console?
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On 1/30/2012 12:03 PM, frame wrote:
> Hi:
>
> We have an existing Java program, which prints out a lot of message
> using System.out.println() method to the console. There are about 500
> those calls in the code. We hope to add one more feature: besides
> print out to the console as it is doing now, we also want to store
> those messages in a text file. So the message will be in two places:
> one place -- the console -- is shown the message progressively as the
> program is running; another place -- a text file -- is created at the
> end of the program.
...

Is it really necessary to delay creating the text file until the end?

That complicates things. For example, the simplest way of using the
System.setOut idea would be to write each line to both the old
System.out and a text file at the same time. Similarly, the UNIX tee
command writes its output file as it goes along, not just at the end.

Patricia