If I have a need in a servlet to convert an integer to a string, I know of these 2 options: 1) String s = Integer.toString(i) 2) String s = (new Integer(i)).toString() It seems that the 1st method would be more memory-efficient. But is the 1st method not threadsafe if it is not synchronized, and thus would I be better off using the 2nd method? ------------------ United Health Group Hartford, CT, USA
Why would you think Integer.toString(i) is not threadsafe? It does not access anything but its own local variables. Most often, I use String.valueOf(i). ------------------ Phil Hanna Sun Certified Programmer for the Java 2 Platform Author of : JSP: The Complete Reference Instant Java Servlets
Phil Hanna<BR>Sun Certified Programmer for the Java 2 Platform<BR>Author of :<BR><A HREF="http://www.amazon.com/exec/obidos/ASIN/0072127686/electricporkchop/107-3548162-1137317" TARGET=_blank rel="nofollow">JSP: The Complete Reference</A><BR><A HREF="http://www.amazon.com/exec/obidos/ASIN/0072124253/electricporkchop/107-3548162-1137317" TARGET=_blank rel="nofollow">Instant Java Servlets</A>
Joined: Dec 25, 2000
Hi Phil, The point I am not clear on, is whether local variables work in static methods the same way they work in non-static methods. I've read that local variables are created on a stack that is assigned by the JVM to each thread. You seem to be saying that this is true regardless of whether the method is static or non-static. I could not find a statement that explicitly said that in the Java 2.0 language spec document at http://java.sun.com/docs/books/jls/second_edition/html/j.title.doc.html But I may not know where to look. Is there a way I prove to myself that local variables are always threadsafe in a static method? Does the language spec spell this behavior out somewhere?
Local variables are always Thread safe because the only reference is in the stack of a single Thread. There is no difference between static and instance methods in the way they are called. Probably the reason you didn't find a statement to that effect is that it never occurred to anybody to doubt it. When in doubt about any method - look at the source code for the class. Bill