Question

Do check this code:

int result = 0;
result = result++;
System.out.println("Result 1 = " + result);
result++;
System.out.println("Result 2 = " + result);

The output i was expecting was :

Result 1 = 1
Result 2 = 2

But i got the output:

Result 1 = 0
Result 2 = 1

The problem lies at Line2. Can some one explain on Unary operator.??

Answer 1

In the statement i = i++:

This is guarenteed behaviour. The value of i is read for the purposes of evaluating the righthand side of the assignment. i is then incremented. statement end results in the evaluation result being assigned to i.

There are two assignments in i = i++; and the last one to be executed will determine the result. The last to be executed will always be the statement level assignment and not the incrementer/decrementer.

Terrible way to write code, but there you have it a deterministic result at least.

http://forums.sun.com/thread.jspa?threadID=318496