Can someone explain this Java code?

Question

class Test
{
public static void main(String [] args)
{
int x= 0;
int y= 0;
for (int z = 0; z < 5; z++)
{
if (( ++x > 2 ) && (++y > 2))
{
x++;
}
}
System.out.println(x + " " + y);
}
}

The output is: 6 3

I am unable to understand it as to why?

Answer 1

It's due to a comparison short circuit in the if statement.
Since ++x > 2 is false the other comparison isn't checked until the 1st is true.
for loop iterates 5 times
1st:
++x is ran in conditional and ++y is not
x = 1 y = 0 and if body is skipped
2nd:
++x is ran again and ++y is not
x = 2 y = 0 if body is skipped
3rd:
++x is ran and now ++y is ran
x = 3 y = 1 if body is skipped
4th:
++x and ++y are ran
x = 4 y = 2 if body is skipped
5th:
++x and ++y are ran
x = 5 y = 3 if body is ran
x++ is ran
x = 6 y = 3

Answer 2

I guess you want to know the reason why y isn't 6?
It is because the jre just checks if the first expression (++x>2) is true and then recognises the AND operator. It doesn't evaluate the second expression (++y>2) if the first is false, because it already knows that the result of the boolean expression is false (AND results in false if one of the operands is false).

Answer 3

ChaoticDawg nuce explanation

Answer 4

thanks everyone... understood :)