System.out closed? Can I reopen it?

Question

I was helping a friend to write some Java code, who doesn\'t know a lot about Java. So I wrote him some helper functions to easily get things done that are a little quirky i

Answer 1

Like the others have said, a stream should be closed where it was opened. However, you could write a facade to protect a stream from getting closed like this:

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class UnclosableOutputStream extends FilterOutputStream {

    public UnclosableOutputStream(OutputStream out) {
        super(out);
    }

    @Override
    public void close() throws IOException {
        out.flush();
    }
}

and use it like this:

new StreamHelper().write("Hello Test", new UnclosableOutputStream(System.out));

Might come in handy for test scenarios etc.