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Is this valid Java code? My teacher claims it is, but I'm really not so sure.

Hello,

I am getting ready for a java certification exam and I have seen code LIKE this in one of the practice tests:

class Foo { 
int x = 1; 
public static void main(String [] args) { 
 int x = 2; 
 Foo f = new Foo(); 
 f.whatever(); 
} 
{ x += x; } // <-- what's up with this?
void whatever() { 
 ++x; 
 System.out.println(x); 
} 
}

My question is ... Is it valid to write code in curly braces outside a method? What are the effects of these (if any)