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PrintStream constructor deprecated :(

Posted on 1998-02-03
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Last Modified: 2008-02-01
i want to use System.setOut( PrintStream out ) to re-assign System.out.

i dont see a non-deprecated way of obtaining an instance of PrintStream that i need.

any ideas?

currently i am using :

    ByteArrayOutputStream outputByteArray = new ByteArrayOutputStream();
    PrintStream debugOutputStream = new PrintStream( outputByteArray, true );
    PrintStream oldOut = System.out;
    System.setOut( debugOutputStream );

but the PrintStream constructor brings up a warning that it is deprecated.

thanks

musashi
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Question by:musashi
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Author Comment

by:musashi
ID: 1232826
Edited text of question
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Expert Comment

by:froderik
ID: 1232827
The PrintStream class was replaced in Java 1.1 with PrintWriter. It has the same methods as PrintStream so you could just replace all ocurrences of PrintStream with PrintWriter. The only thing that is different is that there are two more constructors that take Writer objects as argument.

(There is no way to keep the PrintStream class, compile with Java 1.1 compiler and not recieving an deprecation warning. Your program should work anyway though. If the program will live and be maintained for a long time it could be wise to do the replacement. Otherwise it doesn't matter much, as long as the program works.)

Best regards

Fredrik
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Author Comment

by:musashi
ID: 1232828
>The PrintStream class was replaced in Java 1.1 with PrintWriter.

i knew this and would use it if i could but System.setOut() will only take a "PrintStream".

if there was a way to convert a "PrintWriter" to a "PrintStream" then i wouldn't have any problems. as far as i have been able to figure out, you can convert an "OutputStream" to a "Writer" but not vice versa (which is what i need).

is there a way?

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Expert Comment

by:gwalters
ID: 1232829
I agree with froderik.  There's nothing inherently wrong with using deprecated methods/classes, as long as you understand that your code may not work in a future version.  However, if some future version eliminates (as opposed to deprecating) PrintStream, you can be sure that System.setOut(PrintStream) will also be eliminated and, hopefully, replaced with System.setOut(PrintWriter).

What gets me is that System.setOut() was added for 1.1!  They tell you to use PrintWriter in all new code, and then they add new code that uses PrintStream.

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Author Comment

by:musashi
ID: 1232830
>What gets me is that System.setOut() was added for 1.1! They tell you to use PrintWriter in all new code, and then they add new code that uses PrintStream.

yes i know, i think sun screwed up here.

anyway, froderik. submit something as an answer again and you can have the points.
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Accepted Solution

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froderik earned 100 total points
ID: 1232831
I have to admit that I mostly answered the latter part of the question. It is really strange design, to require a deprecated class as argument in a new method. They were out of time, I guess.

If you really want to use PrintWriter instead of PrintStream there is at least one way: subclass PrintStream. Take a PrintWriter object as argument to the constructor and simply implement all methods from the superclass to point to the constructor argument. I would say that it is too much work...

public class PrintStreamWriter extends PrintStream
{
  private PrintWriter myWriter;

  public PrintStreamWriter( PrintWriter aWriter )
  {
    this.myWriter = aWriter;
  }

  public print( String s )
  {
    myWriter.print( s );
  }

  // And so on..
}
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