BufferedWriter.newLine() except after the last line

Question

I'm drawing a blank on this. The problem I'm facing is I don't want a newLine() created after the last line is written to the new file. How can I accomplish this?

while (((aLine = reader.readLine()) != null)) {
                writer.write(aLine);
                writer.newLine();
            }

Switch that and do a `newLine()` before each line except the first. It's harder to tell when you're at the last line but it should be easy to tell which is the first. — Thomas, Oct 29 '18 at 13:20
@Thomas: Will that not generate an extra new line before the first line? — Pushpesh Kumar Rajwanshi, Oct 29 '18 at 13:21
@PushpeshKumarRajwanshi well, I wrote "...except the first". That shouldn't create a new line before the first line. ;) — Thomas, Oct 29 '18 at 13:22
oh ok sorry I didn't realize you mentioned except the first. That way you are right. — Pushpesh Kumar Rajwanshi, Oct 29 '18 at 13:24
Thanks for your input guys n gals. tevemadar's answer seems to articulate this perfectly for me :) — notAChance, Oct 29 '18 at 13:35

score 4 · Accepted Answer · answered Oct 29 '18 at 13:21

4

As you can not see the future, you have to rely on the past: instead of emitting a newline after the last line, emit it before all lines, except the first one:

bool first=true;
while (((aLine = reader.readLine()) != null)) {
    if(!first)writer.newLine();
    else first=false;
    writer.write(aLine);
}

answered Oct 29 '18 at 13:21

tevemadar

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"As you can not see the future" - I like that :) – Thomas Oct 29 '18 at 13:22
@Thomas I like that too :) Thanks tevemadar for your eloquence and help. – notAChance Oct 29 '18 at 13:36

score 0 · Answer 2 · answered Oct 29 '18 at 13:22

0

boolean flag = false;
while (((aLine = reader.readLine()) != null)) {
    if(flag)
        writer.newLine();
    writer.write(aLine);
    flag = true;
}

answered Oct 29 '18 at 13:22

Jignesh M. Khatri

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score 0 · Answer 3 · answered Oct 29 '18 at 13:29

0

As a slight variation on the existing answers (which propose writing the newline first):

String separator = "";
while (((aLine = reader.readLine()) != null)) {
  writer.write(separator);
  writer.write(aLine);
  separator = System.lineSeparator();
}

answered Oct 29 '18 at 13:29

Andy Turner

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BufferedWriter.newLine() except after the last line

3 Answers3