java for

double[] ar = {1.2, 3.0, 0.8};
int sum = 0;
for (double d : ar) { // d gets successively each value in ar.
sum += d;
}

And here is the same loop using the basic for. It requires an extra iteration variable.

double[] ar = {1.2, 3.0, 0.8};
int sum = 0;
for (int i = 0; i < ar.length; i++) { // i indexes each element successively.
sum += ar[i];
}