How this results in infinite loop i = i++?

Question

for(int i=0 ; i<5;){

System.out.println(i);
i = i++;
}

Answer 1

i++ creates a copy of the old i, changes i and then returns the copy of the old i.

So you create a copy, change the value, and then, using i = ... , store the old value again in i, effectively nullifying the change.

Instead you should normally just write i++.

Answer 2

i = i++ means i equals i THEN increase i by one, so as HonFu said you're just re-storing the old value of i - it always equals 0, using just i++ is neater.

You could also change it to i = ++i you change the order of actions to increase i by one THEN store the new value as i, and you'll get the result you want.