code: public static String buildStringFromLines(String... lines) {
  		int numChars = lines.length;
  		for (String line : lines) {
  			numChars += line.length();
  		}
  		StringBuilder builder = new StringBuilder(numChars);
  		for (String line : lines) {
  			builder.append(line);
  			builder.append('\n');
  		}
  		return builder.toString();
  	}
docs: Easy way to create a String from a bunch of lines.