Post fix ++ operator

Question

class C{
     static int f1(int i) {
      System.out.print(i + ",");
      return 0;
     public static void main (String[] args) {
      int i = 0;
      i = i++ + f1(i);
      System.out.println(i);
}The above code gives the 1,0 output. Anybody explain how and why?
Thanks in advance...

Answer 1

public class Precedence {
     static int f1(int i) {
          System.out.print(i + ",");
          return 0;
     public static void main (String[] args) {
          * This is because of operators precedence.
          * Your code is interpreted for the compiler as code bellow.
          int i = 0;
          i++;
          i = f1(i);
          System.out.println(i);
          * line i = (i++) + f1(i);
          * first executes i++;
          * second f1 is executed and its result asigned to i:
          * i = (i++) --> is not more part of execution
          * i = ... f1(i); is set to i.
          * So as f1 returns 0 i gets again 0 value.
* If you execute this code you'll see
* that line a = i++; first sets the value of
* a to the value that contains i and after increment i.
* If you first want to increment i and then
* copy the value to a you should do this:
* a = ++i;
public class Precedence {
     public static void main(String [] args) {
          int i = 0, a = 0;
          a = i++;
          System.out.println(a);
          System.out.println(i);
read http://java.sun.com/docs/books/tutorial/java/nutsandbolts/operators.html for more details.