The Generalized for Loop

• Traverses all elements of a collection:
  

  double[] data = . . .;
  double sum = 0;
  for (double e : data) // You should read this loop as "for each e in data"
  {
     sum = sum + e;
  }

• Traditional alternative:
  

  double[] data = . . .;
  double sum = 0;
  for (int i = 0; i < data.length; i++)
  {
     double e = data[i];
     sum = sum + e;
  }