Chapter 25. Fast, Non-intrusive String Concatenation
A well-known inefficiency in Java [Larm2000] is in string concatenation. The way around it is to ensure that the concatenation is done within a single statement, which facilitates a compiler optimization in which the successive arguments to the + operator are silently translated into calls to a hidden
StringBuffer instance, resulting in a more efficient construction of the string from its constituent parts. Hence,
String s = s1 + " " + s2 + " " + s3;
is automatically converted to
StringBuffer sb = new StringBuffer(); sb.append(s1); sb.append(" "); sb.append(s2); sb.append(" "); sb.append(s3); String s = sb.toString();
This results in significant increases in performance [Wils2003e] compared ...