Head First Javaexercise problem

Hi,

I got a problem with my exericese of Head First Java.

My code is :
import java.util.*; import java.io.*; import static java.lang.System.out; class FullMoons { static int DAY_IM=1000*60*60*24; public static void main(String[] args) { Calendar c= Calendar.getInstance(); c.set(2004,0,7,15,40); long day1=c.getTimeInMillis(); for(int x=0; x<60; x++) { day1 +=(DAY_IM*29.52); c.setTimeInMillis(day1); out.println(String.format("full moon on %tc", c)); } } }
It compiles fine, but won't output.

The error message is:

Exception in thread "main" java.lang.NoSuchMethodError: method java.lang.String.format with signature (Ljava.lang.String;[Ljava.lang.Object;) Ljava.lang.String; was not found.
at FullMoons.main(FullMoons.java:14)

My operating system is Ubontu Linux, and java version is 5.

Please help me with it.

Edit by mw: Added Code Tags and disabled smilies.
[ July 09, 2007: Message edited by: marc weber ]

Yanli,
Welcome to JavaRanch!

Have you tried typing "javac -version" to make sure the version of Java being used is the same as the one you expect? It's possible an older version of Java is getting in the path first.