How to nicely format floating numbers to String without unnecessary decimal 0?

If the idea is to print integers stored as doubles as if they are integers, and otherwise print the doubles with the minimum necessary precision:

publicstaticString fmt(double d){if(d ==(long) d)returnString.format("%d",(long)d);elsereturnString.format("%s",d);}

Produces:

2320.1812378751924.5801.2345

And does not rely on string manipulation.