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== operator for String

Hi,
as I understand how operator == works
following code will produce output
== not equal


String testString = "test";
testString += "1";
if(testString == "test1"){
System.out.println("== equal");
}else{
System.out.println("== not equal");
}

after compilation and running that code on MAC OS X I really received "== not equal"
no surprise :-)

but here is a question, if you look at source of class java.beans.XMLDecoder
from 1.4 JDK you will see many places like that:

if (name == "null" ||
name == "string" ||
name == "class" ||
isPrimitive(name)) {
return;
}

or

if (name == "void") {
how it could work?

so my question is there some changes to Java Language related to operator == for strings?
(I tried to look for languages changes on sun site, but didn't found, maybe I didn't try hard enough :-( )
thanks
Dmitry Markman
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