Operator precedence: prefix vs postfix incremental

Question

Hello pal,
I am confused whether postfix incremental operator has more precedence that the prefix incremental operator or not.
The following URL shows that postfix incremental operator has superior precedence.
http://java.sun.com/docs/books/tutorial/java/nutsandbolts/expressions.html
I wrote a simple program to test the concept,however, it looks like they have equal precedence.
public class Precedence {
        public static void main(String[] args) {
                int i, k;
                k = 10;
                i = ++k * k++;
                System.out.println("k = 10;");
                System.out.println("i = ++k * k++;" + " = " + i);
                k = 10;
                i = k++ * ++k;
                System.out.println("k = 10;");
                System.out.println("i = k++ * ++k;" + " = " + i);
}The output surprises me, though. (Note that I run the program on IBM JRE 1.3.1 build cn131w-20020403 ORB130.)
k = 10;
i = ++k * k++; = 121
k = 10;
i = k++ * ++k; = 120
Question: Is this a correct behaviour ... or my test program is wrong?

Answer 1

Yes, this is correct behavior.
k = 10;
i = ++k * k++;
++k is incremented to 11, but k++ is not because its a postfix increment, it is assigned after i. So this ends up being 11 * 11 which gets you 121.
k = 10;
i = k++ * ++k;
k++ is assign after the operator, so it remains 10. ++k is a prefix increment, so this becomes 11, but the postfix increment makes it 12. So this ends up being 10 * 12, which becomes 120.
It all makes sense if you look at this code. It's actually what's happening:
public class Precedence {
        public static void main(String[] args) {
                int i, k, j;
                j = 0;
                k = 10;
                i = ++k;
                i = i * k++;
                System.out.println("k = 10;");
                System.out.println("i = ++k * k++;" + " = " + i);
                k = 10;
                i = k++;
                i = i * ++k;
                System.out.println("k = 10;");
                System.out.println("i = k++ * ++k;" + " = " + i);