Gracefully remove "\n" delimiter after last String within StringBuilder

Have following Java code,that creates StringBuilder with "\n",i.e. carriage return delimiters:

while (scanner.hasNextLine()){
    sb.append(scanner.nextLine()).append("\n");
}

It's occurred,that after last开发者_JAVA技巧 String(line) had "\n" symbol.

How to gracefully remove last "\n" from resulting StringBuilder object?

thanks.

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This has always worked for me

sb.setLength(sb.length() - 1);

Operation is pretty lightweight, internal value holding current content size will just be decreased by 1.

Also, check length value before doing it if you think buffer may be empty.

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If you're working with a small enough number of lines, you can put all the lines in a List<String> and then use StringUtils.join(myList, "\n");

Another option is to trim() the resulting string.

Update after discovering guava's neat Joiner class:

Joiner.on('\n').join(myList)

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You could build the result without a newline to get rid of:

String separator = "";
while (scanner.hasNextLine()){
    sb.append(separator).append(scanner.nextLine());
    separator = "\n";
}

---

sb.deleteCharAt(sb.length()-1);

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Instead of having to remove it you could simply never add it.

while (scanner.hasNextLine()) {
    if (sb.length()>0) sb.append("\n");
    sb.append(scanner.nextLine());
}

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bool isFirst = true;
while (scanner.hasNextLine()){
  if(!isFirst)
    sb.append("\n"));
  else
    isFirst = false;

  sb.append(scanner.nextLine());

}

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if (scanner.hasNextLine()) 
  sb.append(scanner.nextLine());
while (scanner.hasNextLine()){
  sb.append("\n").append(scanner.nextLine());
}