I didn't read in full everything here, but using StringBuilder is good old
optimization, strange many don't know it here...
http://www.venishjoe.net/2009/11/java-string-concatenation-and.html
Having said that it seems that both of you are kind of right, recent JDK's
compile '+' into StringBuilder, but not in all cases, so you have to be
carefull.
For example, this would be compiled into builder:
String ab = a + b;
but this will be compiled into 2 StringBuilder...
String ab = "ab";
ab += a;
ab += b;
вторник, 24 июля 2012 г., 20:40:10 UTC+3 пользователь Brandon Wirtz написал:
>
> And you get a new string builder each loop. If you use string builder and
> recycle it you don't have to re-create the object. Which doesn't create so
> much garbage.
> You have the answer and you don't understand it.
>
>
>
> > Try compiling these two classes. They produce *identical* class files:
> >
> > ---- File m1/Stringy.java ----
> > public class Stringy {
> > public static void main(String[] args) {
> > String foo = "def";
> > System.out.println("abc" + foo);
> > }
> > }
> > ---- File m2/Stringy.java ----
> > public class Stringy {
> > public static void main(String[] args) {
> > String foo = "def";
> > System.out.println(new
> > StringBuilder().append("abc").append(foo).toString());
> > }
> > }
>
>
>
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