java 1.5 vs 1.4

1. autoboxing/unboxing
2.generics
3.annotations
4.java.util.concurrent
5.enum

http://docs.oracle.com/javase/1.5.0/docs/guide/language/enums.html
6.variable number of arguments

aMethod(T... args)

a T... is only a syntactic sugar for a T[].
7.for each
8. import static

http://www.deitel.com/articles/java_tutorials/20060211/index.html

the following syntax imports a particular static member:

import static packageName.ClassName.staticMemberName;

The following syntax imports all static members of a class:

import static packageName.ClassName.*;

9. printf

great examples

http://www.java2s.com/Tutorial/Java/0120__Development/0200__printf-Method.htm