Remove last character of a StringBuilder?
Others have pointed out the deleteCharAt method, but here's another alternative approach:
String prefix = "";for (String serverId : serverIds) { sb.append(prefix); prefix = ","; sb.append(serverId);}Alternatively, use the Joiner class from Guava :)
As of Java 8, StringJoiner is part of the standard JRE.
Another simple solution is:
sb.setLength(sb.length() - 1);A more complicated solution:
The above solution assumes that sb.length() > 0 ... i.e. there is a "last character" to remove. If you can't make that assumption, and/or you can't deal with the exception that would ensue if the assumption is incorrect, then check the StringBuilder's length first; e.g.
// Readable versionif (sb.length() > 0) { sb.setLength(sb.length() - 1);}or
// Concise but harder-to-read version of the above.sb.setLength(Math.max(sb.length() - 1, 0));